Highlights of Data and Features Recently Added to NED (December 2008)
Data for 154 million objects from the
Sloan Digital Sky Survey Data Release 6
(SDSS DR6) photometric catalog have been integrated into NED.
This release includes new
cross-identifications with multiwavelength observations previously
cross-correlated by NED
from tens of thousands of catalogs and journal articles; these
multiwavelength cross-IDs have enabled
the incorporation of SDSS DR6 photometry into NED's Spectral Energy
Distributions.
In the user interface, object queries now include the ability to
change the cosmological parameters
used to calculate Hubble distances and other Derived Quantities. In addition,
magnitudes with filter codes are now included in the object search result
tables
(e.g., objects within 2 arcminutes of SDSS J140003.70+562055.3),
and the Advanced All-Sky (By Parameters) search includes Spitzer IRAC and
MIPS, SDSS, and GALEX filters
among the photometric constraints.
Further details follow.
Database Enhancements:
As our infrastructure and data management processes continue to evolve,
NED is scaling up
to handle modern sky surveys containing hundreds of millions of objects.
The first extremely large dataset to be integrated into NED involves
154 million objects
from the Sloan Digital Sky Survey (SDSS) Data Release 6 (DR6) photometric
catalog.
These are a subset of the 217 million objects in DR6, which were selected
using the following
"Clean sample" filters based on recommendations by the SDSS team (see
SDSS recommendations for clean samples of objects):
- All objects with SDSS PRIMARY status bit set,
- and SDSS flags set as follows
- BINNED1
- and not BRIGHT
- and (not BLENDED or NODEBLEND)
- and not NOPROFILE
- and not (PEAKCENTER or NOTCHECKED
or (DEBLEND_NOPEAK and r-band PSF mag err > 0.2))
- and not DEBLENDED_AS_MOVING
We did not filter out objects with the SATURATED flag set, because although
SDSS photometry is unreliable for such sources,
this would have omitted useful SDSS positions and size measurements for
galaxies with bright nuclei, including many nearby Seyfert galaxies.
The requirement that Status=PRIMARY excluded objects
with Status=FAMILY that were de-blended by the pipeline into smaller components
(these CHILD objects themselves have Status=PRIMARY),
and also excluded repeated observations with Status=SECONDARY.
SDSS classified each object as either a "galaxy" or "star", depending
on whether the pipeline
determined it to be resolved (extended) or unresolved (a point source).
Along with objects of type "galaxy", objects of type "star" were also
folded into NED,
because this SDSS classification is strictly morphological and includes many
point sources
that are actually QSOs and unresolved, compact galaxies. Whenever possible,
both types of SDSS objects
have been cross-matched to objects in the previous version of NED
(which had ~10 million objects
total, including ~4 million objects within the SDSS footprint) using our
standard position- and data-matching procedures.
The new data in NED include:
- The establishment of multiwavelength cross-identifications
with previous observations from tens of thousands of catalogs and
journal papers.
(Example: multiwavelength cross-IDs with SDSS J074906.51+451033.9)
These initial Cross-IDs and Associations between SDSS objects and other
objects in NED will be refined in future updates.
- Basic Data, including representative g-band magnitudes, positions, and
classifications
(Example: SDSS J133840.44+481704.9)
- Position measurements in the r band (Example: SDSS J133936.13+430238.7)
- Size measurements in the r band using 4 methods: Isophotal, Petrosian,
de Vaucouleurs, and Exponential
(Example: SDSS J133934.97+430351.0)
- Photometric measurements in all 5 bands [ugriz], each with 3 methods
(PSF, Model, CModel) for extended objects (Example: SDSS J135554.50+454822.6)
and with one method (PSF) for point sources (Example: SDSS J133933.60+430228.5), have been folded into NED's SEDs
- Links to SDSS SkyServer
for detailed
pipeline processing flags, spectra and images for each object. (Example: SDSS J074906.50+451033.9)
With over 1.7 billion detailed photometric measurements (PSF, Model and
CModel magnitudes for galaxies) in five bands, and hundreds
of millions of diameter and position measurements, as well as
crucial flags from the pipeline processing, folding in SDSS DR6
(the "Clean Sample" subset described above)
has expanded NED's tabular database volume by a factor of ~200.
Future work with SDSS:
- While we have carefully checked the resulting database of about 163 million
objects, there are certain to be anomalies included. Many SDSS objects,
for example, are parts of galaxies covering a major portion of a spiral arm.
These may be cross-matched to radio sources or H II regions with relatively
large position uncertainties that coincidentally overlap the much smaller
position error ellipses of the SDSS objects. Some of the cross-matches made
in this initial release of DR6 in NED may be replaced by statistical
Associations in future updates.
- The current release includes DR6 objects that have either no counterparts
among
objects previously in NED, or generally reliable cross-identifications with
objects previously in NED based on observations across the EM spectrum.
However, hundreds of thousands of SDSS objects have been determined by our
cross-comparison software to be possible (candidate) matches with other
objects in NED. In addition, there are
many cases in which multiple SDSS objects may be associated with single objects
observed with lower resolution (e.g., radio, UV, or X-ray surveys).
Such 1-to-1 or 1-to-many relationships will be folded in as
additional Associations
in future updates to NED.
Example: 6C radio galaxies associated with SDSS J132435.20+504102.3
- SDSS measurements for large galaxies, including a subset of objects with
Status=FAMILY
from the standard SDSS pipeline and measurements derived from custom mosaics
such as those produced
for selected galaxies in the RC3 by David Hogg at NYU,
will be folded into NED at a later date.
- SDSS DR7 was released while we were
completing the process of integrating DR6 into NED.
Due to the extensive effort and complexities
involved in handling re-processed data (positions and photometric calibration
changed slightly from DR6 to DR7), in addition
to all of the other data sets that we have to process,
it will take us many months
to incorporate final measurements from SDSS-II into NED.
- Please let us know about any peculiarities or omissions,
so that future releases of NED can more accurately
reflect our knowledge of the extragalactic Universe.
Interface enhancements:
- Since the release of Derived Quantities in 2007, NED has been
reporting radial velocities corrected for motions due to major attractors
(superclusters) in a local velocity field model
(Mould et
al. 2000, ApJ, 529, 786), Hubble flow distances, and spatial scales,
as well as quantities derived from the redshift corrected to the
reference frame defined by the 3K background and further
corrected for a concordance cosmological model with
Ho = 73 km s-1 Mpc-1,
Ωmatter = 0.27, and Ωvacuum = 0.73.
Object searches now include the ability to
change the cosmological parameters
used to calculate Hubble distances and other Derived Quantities,
including a short-cut to select high precision parameters from
the recent Five-Year WMAP results (i.e., Ho = 70.5 +/- 1.3 km s-1
Mpc-1; Hinshaw et al. 2009, ApJS, in press; http://arxiv.org/abs/0803.0732).
-
Result tables returned by object searches now include magnitudes and filter
codes, where appropriate.
Example:
objects within 2 arcminutes of SDSS J140003.70+562055.3
-
The Advanced All-Sky (By Parameters) search includes Spitzer IRAC and
MIPS, SDSS, and GALEX filters
among the photometric constraints.
Note that this feature currently returns objects with
observations in the frequency range corresponding to the selected
passband filter. For example, selection of the Spitzer MIPS 24 um filter
will also return objects with photometry from the IRAS 25 um filter,
because these filters overlap. This approach permits the location of objects
with photometry in the selected region of the spectrum, while cutting
across multiple surveys, detectors and filters that have been
cross-correlated by NED. A future upgrade will include an option to
restrict the search to only the selected passband filter.
-
Notice: The growing richness of information available in NED presents
a need to revamp the organization of the object query reports
to make it easier to locate the different types of information and
related categories of links to "drill down" for further details. Users
with client computer programs and scripts that automate queries to the NED
server
are encouraged to use the XML/VOTable or simple ASCII table output modes
to avoid having to frequently change parsing algorithms, as the HTML version
of the query
reports will continue to evolve primarily to meet the needs of
interactive users.
For further details, see NED's
Guidelines for Automated Queries.
27 March 2008 Revisions
Data for nearly 300,000 objects linked to
1448 journal articles and catalogs,
redshifts for about 215,000 objects,
0.5 million multiwavelength cross-IDs, and nearly
1.7 million photometric measurements
have been added to NED since the previous public release.
Highlights include:
- 214,687 detailed redshift data frames from 55 published papers
and catalogues including
-
2002AJ....123..567S,
2003AJ....126.2579S,
2005AJ....130..367S, and
2007AJ....134..102S, Schneider et al: The Sloan Digital Sky Survey Quasar Catalog, Papers 1-4;
-
2003AJ....125.1817B, Bernardi et al: Early-Type Galaxies in the Sloan Digital Sky Survey. I. The Sample;
-
1998A&AS..130..323V, Vettolani et al: The ESO Slice Project (ESP) galaxy redshift survey. III. The Sample;
-
2005ApJS..160..149S, Springob et al: A Digital Archive of H I 21 Centimeter Line Spectra of Optically Targeted Galaxies;
-
2004A&A...421..913W, Wolf et al: A catalogue of the Chandra Deep Field South with multi-colour classification and photometric redshifts from COMBO-17;
-
2004ApJS..150....1B, Benitez et al: Faint Galaxies in Deep Advanced Camera for Surveys Observations;
-
2000ApJS..130..237T, Tucker et al: Loose Groups of Galaxies in the Las Campanas Redshift Survey;
-
2003AJ....126.2268W, Wegner et al: Redshift-Distance Survey of Early-Type Galaxies: Spectroscopic Data;
-
2000A&A...355..900D, Drinkwater et al: The Fornax Spectroscopic survey. I;
and
-
2001AJ....121...66S, Salzer et al: THE KPNO INTERNATIONAL SPECTROSCOPIC SURVEY. II. H{alpha}-SELECTED SURVEY LIST 1.
- 200,089 NOAO Deep Wide-Field Survey (NDWFS) Bootes objects from
2007ApJS..169...21C, Cool, R.J.: zBootes: z-Band Photometry in the NOAO Deep Wide-Field Survey Bootes Field
- 36,121 GALEX UltraViolet objects from
2007ApJ...664...53A, Atlee, D. W. and Gould, A.: Photometric Selection of QSO Candidates from GALEX Sources
- 13,825 MaxBCG clusters and Brightest Cluster Galaxies in the SDSS from
2007ApJ...660..239K, Koester et al: A MaxBCG Catalog of 13,823 Galaxy Clusters from the Sloan Digital Sky Survey
- 4,667 galaxies in the direction of Abell 3526
2007ApJS..170...95C, Chiboucas, K. and Mateo, M.: The Luminosity Function of Nearby Galaxy Clusters. I
- 2,478 VERA radio sources from
2007AJ....133.2487P, Petrov et al: VERA 22 GHz Fringe Search Survey
- 625 SDSS-C4 galaxy clusters from
2007MNRAS.379..867V, Von der Linden et al: How special are brightest group and cluster galaxies?
- 143 galaxies in Abell 0773 from
2007A&A...467...37B, Barrena et al: Internal dynamics of the radio halo cluster Abell 773: a multiwavelength analysis
Latest review papers
LEVEL 5 Knowledgebase
for Extragalactic Astronomy and Cosmology:
Highlights of recent additions to photometry:
Recent additions to
NED's image database
- 222 K-band images from
2005MNRAS.360..587B, Balogh et al: Near-infrared imaging of 222 nearby H-delta-strong galaxies from the Sloan Digital Sky Survey,
- RGB images for 506 galaxies from
2004PASP..116..133L, Lupton et al: Preparing Red-Green-Blue Images from CCD Data
- UV images for 27 galaxies from
2007ApJ...659..162T, Taylor-Mager et al: Dependence of Galaxy Structure on Rest-Frame Wavelength and Galaxy Type
- Spitzer IRAC and MIPS, and ground-based BVRI and H-alpha images for the
75 galaxies in the SINGS sample described in
2003PASP..115..928K, Kennicutt et al: SINGS: The SIRTF Nearby Galaxies Survey
Recent additions to
NED's database of spectra
- 2112 HI spectra for galaxies from
1998A&AS..130..333T, Theureau et al: Kinematics of the local universe. VII. New 21-cm line measurements of 2112 galaxies
- Spitzer IRS and ground-based optical spectra for the 75 galaxies in
the SINGS sample described in
2003PASP..115..928K, Kennicutt et al: SINGS: The SIRTF Nearby Galaxies Survey
24 October 2007 Revisions
Data for nearly 200,000 objects linked to
790 journal articles and catalogs,
redshifts for about 12,000 objects,
0.5 million multiwavelength cross-IDs, and nearly
3.4 million photometric measurements
have been added to NED since the previous public release.
Highlights include:
- 3,251,889 detailed photometry data frames (Petrosian
magnitudes) for over 659,000 SDSS DR5 objects from the
spectroscopically-observed samples described in
2002AJ....124.1810S, Strauss et al: Spectroscopic Target Selection in the
Sloan Digital Sky Survey: The Main Galaxy Sample,
2002AJ....123.2945R, Richards et al: Spectroscopic Target Selection in the
Sloan Digital Sky Survey: The Quasar Sample, and
2001AJ....122.2267E, Eisenstein et al: Spectroscopic Target Selection in
the Sloan Digital Sky Survey: The Luminous Red Galaxy Sample.
- 2,597,657 detailed r-band diameter data points for the
659,000+ SDSS DR5 objects as noted above.
- 157,612 near-IR FLAMEX galaxies from
2006ApJ...639..816E, Elston et al: The FLAMINGOS Extragalactic Survey
- 18,009 galaxies from the 2MASS Flat Galaxy Catalog in
2004BSAO...57....5M, Mitronova et al: The 2MASS-selected Flat Galaxy
Catalog
- 12,555 JVAS/CLASS radio sources from
2007MNRAS.376..371J, Jackson et al: A survey of polarization in the
JVAS/CLASS flat-spectrum radio source surveys - I. The data and catalogue
production
- 5,884 SDSS QSOs with z > 3 from
2007AJ....133.2222S, Shen et al: Clustering of High-Redshift (z >= 2.9)
Quasars from the Sloan Digital Sky Survey
- 3,944 Spitzer extragalactic First Look Survey GMRT radios sources from
2007MNRAS.376.1251G, Garn et al: Deep 610-MHz Giant Metrewave Radio
Telescope observations of the Spitzer extragalactic First Look Survey field -
I. Observations, data analysis and source catalogue
- 1,119 VLBA Imaging and Polarimetry Survey (VIPS) sources from
2007ApJ...658..203H, Helmboldt et al: The VLBA Imaging and Polarimetry
Survey at 5 GHz
Latest review papers
LEVEL 5 Knowledgebase
for Extragalactic Astronomy and Cosmology:
Highlights of recent additions to photometry, SEDs, and spectral line
fluxes:
Recent additions to
NED's image database
- Optical and HI images for Arp 244 (NGC 4038/39) from
2001AJ....122.2969H, Hibbard et al: High-Resolution H I Mapping of NGC
4038/39 ("The Antennae") and Its Tidal Dwarf Galaxy Candidates
- BVRI and K_s images for 19 galaxies from
2006ApJS..163..270G, Gadotti and de Souza: On the Lengths, Colors, and
Ages of 18 Face-on Bars.
Recent additions to
NED's database of spectra
- 8848 HI spectra for UGC and AGC galaxies from
2005ApJS..160..149S, Springob et al: A Digital Archive of HI 21
Centimeter Line Spectra of Optically Targeted Galaxies.
- 87 Optical spectra for 87 low-redshift QSOs from
1992ApJS...80..109B, Boroson and Green: The emission-line properties of
low-redshift quasi-stellar objects.
26 June 2007 Revisions
Data for nearly 65,000 objects linked to
over 840 journal articles and catalogs,
redshifts for about 50,000 objects,
89,000 multiwavelength cross-IDs, and nearly
10 million photometric measurements
have been added to NED since the previous public release.
Highlights include:
- 9,755,643 detailed photometry data frames (PSF, Model, and CModel
magnitudes) for over 659,000 SDSS DR5 objects from the
spectroscopically-observed samples described in
2002AJ....124.1810S, Strauss et al: Spectroscopic Target Selection in the
Sloan Digital Sky Survey: The Main Galaxy Sample,
2002AJ....123.2945R, Richards et al: Spectroscopic Target Selection in the
Sloan Digital Sky Survey: The Quasar Sample, and
2001AJ....122.2267E, Eisenstein et al: Spectroscopic Target Selection in
the Sloan Digital Sky Survey: The Luminous Red Galaxy Sample.
The Petrosian magnitudes for these objects will be available in NED's September
2007 release.
- 18,296 near-IR galaxies from
2006A&A...449..951G, Grazian et al: The GOODS-MUSIC sample: a multicolour
catalog of near-IR selected galaxies in the GOODS-South field
- 14,978 luminous red galaxies and QSOs from
2006MNRAS.372..425C, Cannon et al: The 2dF-SDSS LRG and QSO (2SLAQ)
Luminous Red Galaxy Survey
- 4,492 HII regions in 24 galaxies (of 56) from
2006A&A...459L..13B, Bradley et al: A composite H II region luminosity
function in H of unprecedented statistical weight
- 2,198 groups of galaxies from
2002MNRAS.335..216M, Merchan and Zandivarez: Galaxy groups in the 2dF
Galaxy Redshift Survey: the Catalogue
- 810 1.4GHz sources from
2006ApJS..167..103F, Fomalont et al: The Radio/Optical Catalog of the SSA
13 Field
- 578 high-z, i-band dropout objects from
2006ApJ...653...53B, Bouwens et al: Galaxies at z ~ 6: The UV Luminosity
Function and Luminosity Density from 506 HUDF, HUDF Parallel ACS Field, and
GOODS i-Dropouts.
- NED is now using the latest version (4.0) of the
Aladin Sky Atlas
tool from CDS.
Latest review papers
LEVEL 5 Knowledgebase
for Extragalactic Astronomy and Cosmology:
Highlights of recent additions to photometry, SEDs, and spectral line
fluxes:
Recent additions to
NED's image database
- 279 optical and near-IR images for SINGS galaxies from
2003PASP..115..928K, Kennicutt et al: SINGS: The SIRTF Nearby Galaxies
Survey
- Two CO (J=1-0) line images for M31 from
2006A&A...453..459N, Nieten et al: Molecular gas in the Andromeda galaxy.
Interface enhancements:
- By popular demand, to the right of the SED plot,
the photometry/SED query results page (HTML mode only)
provides a new option to Format tabular data as: Text (ASCII) Table
Bar-Separated Values, Text (ASCII) Table Tab-Separated Values, or
XML/VOTable.
Simply make your selection and then click [Change Table Format].
For example,
view the SED for 3C 269.
- The XML/VOTable output from NED query services have been updated to comply with votlint, a Java tool that validates VOTable documents. As of June 2007, NED's VOTables use XML version 1.0 and VOTable version 1.1.
3 April 2007 Revisions
Data for more than 350,000 objects linked to
over 750 journal articles and catalogs,
redshifts for over 48,000 objects,
274,000 multiwavelength cross-IDs, and
322,000 photometric measurements
have been added to NED since the previous public release.
Highlights include:
- 132,612 extragalactic objects from
2006A&A...451..881B, Berta et al: The ESO-Spitzer Imaging extragalactic
Survey (ESIS). I. WFI B, V, R deep observations of ELAIS-S1 and comparison to
Spitzer and GALEX data
- 100,563 UV-excess QSO candidates from
2004ApJS..155..257R, Richards et al: Efficient Photometric Selection of
Quasars from the Sloan Digital Sky Survey: 100,000 z < 3 Quasars from DR1
- 91,847 candidate AGNs and normal galaxies in SDSS DR2 from
2005AJ....130.2439S, Suchov et al: A Census of Object Types and Redshift
Estimates in the SDSS Photometric Catalog from a Trained Decision Tree
Classifier
- Detailed redshift and photometry data frames for 47,768 2QZ objects
from
2005MNRAS.359...57S, Smith et al., The 2dF QSO Redshift Survey - III. The
input catalogue and
2004MNRAS.349.1397C, Croom et al., The 2dF QSO Redshift Survey - XII. The
spectroscopic catalogue and luminosity function.
- 17,058 24-micron sources from
2006AJ....131.2859F, Fadda et al: The Spitzer Space Telescope Extragalactic
First Look Survey: 24-micron Data Reduction, Catalog, and Source Identification
- 5,632 objects with BR photometry in the Hubble Deep Field South from
2006AJ....131.2383G, Glazebrook et al: Anglo-Australian Telescope Imaging
and Microslit Spectroscopy in the Southern Hubble Deep Field
- 1,545 HII regions, planetary nebulae, and Wolf-Rayet stars in M31 from
1983ApJ...273..544M, Moffat and Shara: Wolf-Rayet stars in the Local Group
galaxies M 31 and NGC 6822,
1987ApJ...320..266M, Moffat and Shara: Wolf-Rayet stars in the Andromeda
galaxy, and
1993A&AS..102..251M, Meyssonnier et al: An objective-prism survey of
emission-line objects in M31.
- 979 24-micron sources in the GOODS EN1 field from
2006MNRAS.371.1891R, Rodighiero et al: Counting individual galaxies from
deep 24-micron Spitzer surveys
- 735 low surface brightness galaxies in the B and R bands from
2006A&A...459..679A, Adami et al: A deep, wide survey of faint,
low-surface-brightness galaxies in the direction of the Coma cluster of
galaxies.
Latest review papers
LEVEL 5 Knowledgebase
for Extragalactic Astronomy and Cosmology:
Highlights of recent additions to photometry, SEDs, and spectral line
fluxes:
Recent additions to
NED's image database
HST images for 60 Seyfert galaxies from
2003ApJS..148..327S, Schmitt et al., A Hubble Space Telescope Survey of
Extended [O III] λ5007 Emission in a Far-Infrared Selected Sample of
Seyfert Galaxies: Observations
Recent additions to
NED's database of spectra
Over 40,000 optical spectra for objects from
2004MNRAS.349.1397C, Croom et al., The 2dF QSO Redshift Survey - XII. The
spectroscopic catalogue and luminosity function.
19 December 2006 Revisions
A overview of NED's latest content
and capabilities, prepared as a handout for the January 2007 AAS meeting in
Seattle, can be downloaded here
(4 MB PDF file).
New NED Features:
-
Data for objects with available redshifts contain the following
Derived Values: Corrected Velocities (Galactocentric GSR, Local Group,
3K CMB, Virgo Infall, Local Infall), Hubble Flow Distances and Scales (e.g.,
kpc/arcsec), and Cosmological Quantities including Luminosity Distance,
Angular-Size Distance, Co-Moving Radial Distance, Scale, Ages, and
Surface Brightness Dimming. A detailed explanation of the computations is
available here,
and example output can be viewed from this query on the redshift-5 object
SDSS J073103.13+445949.5.
-
Literature Data Content and Topical Keywords:
Over the years, NED users have asked for a way to filter the rapidly
growing literature based on data content and specific extragalactic
topics. NED contains substantial information about the data content of
journal articles. Thus, using semi-automated methods, this
information is being used to assign keywords in these
categories: Classifications, Diameters, Components, Images,
Photometry, Kinematics, Object Notes, Positions, and Spectroscopy
(redshift). This information often cannot be extracted from titles
and abstracts alone, but requires knowledge of the content of tables,
figures, etc.
The computer science literature contains debates on the
merits of
free-text searching
versus use of a
"controlled
vocabulary" (keywords) assigned by analysis of a knowledge domain.
The latter often results in more precise results due to normalization of terms.
Examples: "starburst" = "H II" (context: nuclear spectrum);
"ultraviolet" = "UV".
NED is now assigning and displaying
Data Content Keywords (for all papers) using information in NED
and Topical Keywords using information kindly provided by the
ARI Bibliographical Database for Astronomical References
(ARIBIB)
for publications prior to mid-2000. Both keyword sets are displayed in the
output and utilized in new (optional) filters for literature searches based on
Object Names or
Author Names.
- A new Spectral Database service provides:
- A unique repository for spectra previously published only via
rendered plots in journal articles, as well as support for spectra from
large survey archives.
- Preview plots.
- Preservation of the original data format provided by authors and archive
curators.
- Standardized (MKS) units and a uniform VO-compatible data format.
- ASCII and VOTable download options.
- A query service to locate spectra by object name, journal article
(refcode), passband, line filters, and combinations thereof.
- Quick-look visualization and analysis capability.
- Interoperability with VO.
VOTable is used to
standardize the data structure and physical units of spectra provided
in various FITS and ASCII formats. This also facilitates comparison,
fusion and analysis of spectra via VO-compatible applets such as
Specview. We thank Ivo Busko of
STScI for making the Specview
Java applet available and for kindly supporting recent revisions to
accomodate the diverse spectra becoming available in NED. You may
search the spectral database
here.
We also thank the journal article authors and archive curators
who have contributed spectra to NED.
If you would like to submit spectra to NED (in plain ASCII, FITS,
or VOTable XML), please contact us.
Data for 120,000 objects linked to over 530 journal articles
and catalogs, redshifts for over 100,000 objects,
146,000 multiwavelength cross-IDs, and 41,000
photometric measurements have been added to NED since the
previous public release. Highlights include:
- Detailed redshift and position data frames for 659,500 SDSS galaxies
and QSOs from the
Sloan Digital Sky Survey.
- 18,700 galaxies in the Hubble Ultra Deep Field
2006AJ....132..926C Coe et al., Galaxies in the Hubble Ultra Deep Field. I.
- 7,000 from the MMT Hectospec Redshift Survey in
2006AJ....132..231P Papovich et al., An MMT Hectospec Redshift Survey of
24-micron Sources in the Spitzer First Look Survey.
- 880 galaxies and groups from a survey of strong gravitational lenses in
2006ApJ...646...85W Williams et al., First Results from a Photometric
Survey of Strong Gravitational Lens Environments.
- 750 galaxy clusters derived from the SDSS DR4 in
2005AJ....130..968M Miller et al., The C4 Clustering Algorithm: Clusters
of Galaxies in the Sloan Digital Sky Survey.
- 600 galaxy clusters from the Faint Sky Variability Survey in
2006MNRAS.369.1334S Söchting et al., The FSVS Cluster Catalogue:
galaxy clusters and groups in the Faint Sky Variability Survey.
- 322 HII regions and planetary nebulae in M33 from
Latest review papers
LEVEL 5 Knowledgebase
for Extragalactic Astronomy and Cosmology
Highlights of recent additions to photometry, SEDs and spectral line
fluxes:
Recent additions to
NED's image database
- 391 images for nearby galaxies from
2003ApJS..149..327G Grauer et al., Infrared Observations of Galaxies in the
Local Universe. II. 391 Calibrated Images with Photometric and Structural
Measurements.
29 September 2006 Revisions
- 103,202 galaxies and 13,362 QSOs from
2006SDSS5.C...0000: SDSS DR5 Galaxies and QSOs with redshifts.
- 15,343 SDSS QSOs from
2006AJ....131.2766R Richards et al., SDSS Quasar Luminosity Function from
DR3.
- 13,111 visually-selected objects in the field around PKS 0405-123 from
2006ApJ...643..680P Prochaska et al., Probing the Intergalactic
Medium-Galaxy Connection toward PKS 0405-123: The Galaxy Survey.
- 9,928 radio sources from
1974A&AS...18..147F (and references therein), Colla, Fanti, et al., The
Second Bologna Catalogue of Radio Sources at 408 MHz.
- 4,784 SDSS BAL QSOs from
2006ApJS..165....1T Trump et al., A Catalog of Broad Absorption Line
Quasars from SDSS DR3.
- 4,748 Chandra sources in the NOAO Deep Wide-Field Survey field from
2006ApJ...641..140B Brand et al., Optical and Near-Infrared Counterparts
in the Chandra XBootes Survey
- 4,315 HIPASS HI radio sources from
2005MNRAS.361...34D Doyle et al., The HIPASS Catalogue: Optical
counterparts and isolated dark galaxies.
- NED is now using the latest version (3.704) of
Aladin Sky Atlas
tool from CDS.
Latest review papers
LEVEL 5 Knowledgebase
for Extragalactic Astronomy and Cosmology
Highlights of recent additions to photometry:
Recent additions to
NED's image database
- 2820 images for 1034 nearby galaxies from
GALEX
FUV and NUV bands, soon to be published by Gil de Paz et al. in ApJS.
31 July 2006 Revisions
- Now in LEVEL5:
NED-1D: NASA/IPAC EXTRAGALACTIC DATABASE of DISTANCES, version 1.1
for 1,073 galaxies with velocities less than 1/8 c, published between
1990 and 2006.
-
X/Y Offset to RA/Dec Converter. Rectangular coordinates referred
to a known equatorial position may now be converted to equatorial
coordinates using NED's new offset converter tool.
- A list of over
4200 catalogs and papers currently included in NED, with reference codes
and FTP links to the original data sources. Almost all of the acronyms used
in NED are listed here in alphabetical order.
- 6,426 galaxies around 11 clusters from
2006MNRAS.366..645P Pimbblet et al., the Las Campanas/Anglo-Australian
Telescope Rich Cluster Survey.
- 3,649 optical IDs of ROSAT-IRAS FSC sources from
2006A&A...449..425M Mickaelian et al.
- 1,858 FIRES sources around MS 1054.4-0321 from
2006AJ....131.1891F Forster Schreiber et al, the Faint Infrared
Extragalactic Survey.
- 1,002 HIPASS sources from the northern extension of the
2004MNRAS.350.1195M Meyer et al., HI Parkes All-Sky Survey, along with
revised redshifts for all 5,317 HIPASS sources.
- 759 xFLS objects from
2006AJ....131..250F Frayer et al., Spitzer 70 and 160 micron Observations
of the Extragalactic First Look Survey.
Latest review papers
LEVEL 5 Knowledgebase
for Extragalactic Astronomy and Cosmology
Highlights of recent additions to photometry:
Recent additions to
NED's image database
- 644 images for 142 late-type, irregular, and peculiar galaxies from
Taylor et al. (2005ApJ...630..784T)
in UBVR at the Vatican Advanced Technology Telescope (VATT)
and in the mid-UV and near-IR with the Hubble Space Telescope (HST).
- B, R, and H{alpha} images for NGC 1275 from
Conselice et al. (2001AJ....122.2281C)
with the WIYN 3.5 m telescope.
- 70 J and K_s_ images from
Vaduvescu et al. (2005AJ....130.1593V)
for 34 dwarf irregular galaxies (dIs) in the Local Volume
with the Canada-France-Hawaii Telescope
and at the Observatorio Astronomico Nacional.
- 32 J and K_s_ images from
Vaduvescu et al. (2006AJ....131.1318V)
for 16 BCDs in the Virgo Cluster with the 2.1 m telescope at the
Observatorio Astronomico Nacional.
- 372 R and H{alpha} images from
Meurer et al. (2006ApJS..165..307M)
for 93 more galaxies from the Survey for Ionization in Neutral
Gas Galaxies (SINGG).
- 41 B, R, J, K_s_ images from
Galaz et al. (2006AJ....131.2035G)
for a selected sample of high and low surface brightness spiral galaxies.
- 416 SIRTF (IRAC and MIPS), and KPNO/CTIO BVRI and H{alpha} images from
Kennicutt et al. (2003PASP..115..928K)
from SINGS: The SIRTF Nearby Galaxies Survey.
- UBRI images for Mrk 348 from
Anton et al (2002MNRAS.336..319A).
- BVRJHK images for NGC 1097 from
Quillen et al (1995AJ....110..156Q).
- UBVI images for NGC 300 from
Kim et al (2004ChJAA...4..299K).
- J, K, and CO (J = 1-0) images for NGC 1530 from
Regan et al (1995ApJ...449..576R) with the
Berkeley-Illinois-Maryland Array and from KPNO.
- Deep H{alpha} images for HII regions in NGC 628 from
Lelievre and Roy (2000AJ....120.1306L).
- K-band images from
Rauscher (1995AJ....109.1608R)
for the nuclear regions of 15 Virgo Cluster spirals.
- JHK images for M33 from
Regan and Vogel (1994ApJ...434..536R).
- H- and K-band images from
McLeod and Rieke (1995ApJ...441...96M)
for 43 Seyfert galaxies.
- 13 intermediate-band optical images of M81 from
Kong et al (2000AJ....119.2745K).
- HI VLA maps of M81 from
Adler and Westpfahl (1996AJ....111..735A).
- HI VLA maps of NGC 925 and NGC 1744 from
Pisano et al (1998AJ....115..975P).
- 5 GHz VSOP images from
Lister et al (2001ApJ...554..948L)
for 26 Pearson-Readhead active galactic nuclei.
- IRAC images for M81 from
Willner et al (2004ApJS..154..222W).
- H{alpha} images from
Evans et al (1996ApJS..105...93E)
for 17 nearby Seyfert galaxies.
- BVRI, H{alpha}, and 21-cm images for NGC 1530 from
Regan et al (1996AJ....112.2549R).
- 85 HST F255W, F300W, and F814W images from
Windhorst et al (2002ApJS..143..113W)
for 37 nearby galaxies.
6 April 2006 Revisions
Data for 166,000 objects linked to over 700 journal articles
and catalogs, redshifts for 12,000 objects,
600,000 multiwavelength cross-IDs, and 500,000
photometric measurements have been added to NED since the
previous public release. Highlights include:
- 115,417 objects in the Spitzer Space Telescope First-Look Survey (FLS)
and 5239 objects in the ELAIS-N1 fields from Spitzer IRAC images
with detailed photometry at 3.6, 4.5, 5.8, and 8.0 microns, and positions from
Lacy et al.
(2005ApJS..161...41L).
- 7,769 galaxies with redshifts from
Davis
et al.,the DEEP2 survey.
- ~5,000 Chandra X-Ray sources from
the CXOONC
(Chandra Orion Ultradeep Project, Getman et al.),
and CXOXB
(XBootes: An X-Ray Survey of the NDWFS Bootes Field, Kenter et al.) surveys.
- 3,380 galaxies from
Way et al.
(2005AJ....130.2012W), the Southern Abell Redshift Survey.
- 1,633 Lyman-break objects from
Hildebrandt
et al. (2005A&A...441..905H), GaBoDS: The Garching-Bonn Deep Survey.
- 427 emission-line galaxies from
Bongiovanni
et al. (2005MNRAS.359..930B), CUYS: The CIDA-UCM-YALE Survey.
Latest review papers in
LEVEL 5 Knowledgebase
for Extragalactic Astronomy and Cosmology
Highlights of recent additions to photometry:
Recent additions to
NED's image database:
19 December 2005 Revisions
-
Forms to query objects, data, and references contain new options in the
Output Format Specifications
that provide machine-readable tabular output in XML VOTable format
or as plain text (ASCII) with bar-separated or
tab-separated values. VOTable format simplifies interoperability with
other Virtual Observatory tools and services;
bar-separated and tab-separated ASCII tables
can be easily imported into spreadsheets and plotting packages.
- 904,017 objects in the Spitzer Space Telescope First-Look Survey (FLS)
and 273,541 objects in the ELAIS-N1 fields from KPNO images
with detailed R-band photometry and positions from
Fadda et al. (2004AJ....128....1F)
- ~10,000 Northern Sky Cluster Survey (NSCS) clusters from
Lopes et al. (2004AJ....128.1017L)
- ~5,400 IC objects from
Dreyer's
IC1
and IC2.
- ~2,000 Palomar Compact Groups (PCG) galaxies and groups from
de Carvalho et al. (2005AJ....130..425D)
Highlights of recent additions to photometry:
18 October 2005 Revisions
Latest images available in
NED's image database
9 August 2005 Revisions
-
198,213 QUEST (QUasar Equatorial Survey Team) objects from
2004ApJ...617..184R.
-
31,977 <"a href=/cgi-bin/nph-ex_refcode?refcode=20056dF...C...0000J">6dF DR2 galaxies and
QSOs with redshifts.
-
1599 VCDFS (VIMOS/VLT Chandra Deep Field Survey) objects from
2004A&A...428.1043L.
-
425 RCS (Red-Sequence Cluster Survey) clusters from
2005ApJS..157....1G.
-
233 MOST (Molonglo Observatory Synthesis Telescope) radio sources from
2004MNRAS.355...44P.
Latest review papers in
LEVEL 5 Knowledgebase for Extragalactic Astronomy and Cosmology
Latest images available in
NED's image database
-
The 1.4-GHz VLA image for the Spitzer Space Telescope First-Look Survey
field with 3565 objects from
2003AJ....125.2411C.
-
The 1.4-GHz Westerbork Synthesis Radio Telescope (WSRT) image for the
Spitzer Space Telescope First-Look Survey verification region with
1048 objects from
2004A&A...424..371M.
-
J, H, and K FITS images of the central starburst
regions of 24 objects from
1997AJ....113..162C.
28 April 2005 Revisions
*** NOTICE: On 2 May 2005 the legacy VT-100/X-Windows telnet interface
to NED will be retired. ***
-
220,207 SDSS DR2
and DR3 galaxies and QSOs with redshifts.
-
47,769 objects and redshifts from the July 2003 Release of the 2QZ from
2004MNRAS.349.1397C.
-
2,571 HII Regions within 17 Seyfert Galaxies from
1996ApJS..105...93E.
-
1,927 Galaxies detected by ISO with ISOPHOT at 170microns from
2004A&A...422...39S.
-
1,048 1.4GHz sources in the Spitzer Space Telescope FLSv Region from
2004A&A...424..371M.
-
8,968 Galaxies from the HST ACS Camera from
2004ApJS..150....1B.
-
5,494 Galaxies and Redshifts for the NOAO Fundamental Plane Survey from
2004AJ....128.1558S.
-
4,097 detailed redshifts for 3873 galaxies and 112 clusters of galaxies
from
1982MNRAS.200..621C,
1994MNRAS.267..665B,
1997AJ....113..905P,
1998MNRAS.296..599B,
1998MNRAS.300..417R, and
1999MNRAS.305..259W.
-
840 FITS images for quasars and active galactic nuclei at 2cm from
1998AJ....115.1295K and
2004ApJ...609..539K.
Latest review papers in
LEVEL 5 Knowledgebase for Extragalactic Astronomy and Cosmology
22 April 2005 Revisions
22 December 2004 Revisions
-
NED is now providing Diameter Data
Frames for a
representative but large sampling of nearby galaxies and selected
radio sources. In this initial release, a wide variety of optically
measured diameters and exponential scale lengths are returned and
tabulated for individual objects. The primary sources for these data
are
- UGC: 12,940 diameters, axis ratios, and position angles;
- MCG: 49,359 diameters; including 21,591 "inner" diameters and
27,768 "outer" diameters;
- ESO-B: 16,581 diameters and position angles (if given);
- ESO-LV: 158,778 diameters; including
- 15,120 B-band major axes, axis ratios, and position angles at
D_25;
- 14,870 B-band major axes at D_26;
- 13,879 B-band major axes at D_27;
- 14,937 major axes at 70% of total B light;
- 15,160 major axes at 80% of total B light;
- 15,301 major axes at 90% of total B light;
- 14,073 major axes at 50% of total B light;
- 13,817 diameters of the circular aperture enclosing 50% of total B
light;
- 11,486 B scale lengths for exponential disk fits;
- 15,124 B scale lengths from fits to octants; and
- 15,011 R scale lengths from fits to octants.
Future releases will include isophotal optical diameters from RC3, 2MASS
near-infrared diameters, and additional
radio data. As time permits, the By-Parameter search capability will
be augmented to allow all-sky searches using diameter constraints.
- Improvements in the Near Name, Near Position, IAU Format,
and Advanced All-Sky queries:
- The Object Type constraints have been re-organized into
Classified Extragalactic Objects, Unclassified Extragalactic Candidates,
and Components of Galaxies.
- A "Quick-Pick" button is available to simplify selection of only
Classified Extragalactic Objects.
- Among the Object Type constraints, over 20 categories of
"Components of Galaxies" are now available for object inclusion
or exclusion (query filters). These include supernovae,
HII regions, variable stars, planetary nebulae, supernova remnants,
star clusters, and various types of stars.
- A new "Index of Constraint Types" appears on top of each menu.
- In the By Name query menu, the default value of the
"Extended name search?" option located under the Object name
entry field has been changed to "No". Be sure to select "Yes"
if you want related objects such as components of
galaxy pairs, cluster members, or HII regions and variable
stars located within the named object.
- About 35,000 6dF DR1 galaxies and QSOs with their redshifts from
MNRAS (in press).
- About 2500 HII regions and star clusters in M33 from P. Hodge,
B. Skelton, and J. Ashizawa "An Atlas of Local Group Galaxies",
and various other papers, principally
1974A&A....37...33B and
1987A&A...174...28C.
- 8000 objects from the Northern Sky Optical Cluster Survey (NSC)
2003AJ....125.2064G.
- 8000 Nearby Cluster Galaxies
2004ApJS..153..397B.
- 5000 Isolated Galaxies
2003ApJ...598..260P.
- 3700 Low Surface Brightness Galaxies (LCSB)
2003A&A...405...99M.
- 2000 Galaxies in southern bright star fields (SBSF)
2003A&A...406..593B.
14 June 2004 Revisions
25 March 2004 Revisions
- Through a collaboration with
IRSA
and the
NVO,
FITS images archived in NED can now be queried by
Celestial Coordinates and Areal Coverage.
This is in addition to the original capability to
Search for Images by Object
Name.
- Version 2.0 of
Aladin
from CDS has been configured for visualization and
interaction with images in the NED archive. When the Java
applet is launched (after an image query by object name),
overlay planes include markers for objects in NED,
the USNO A-2.0, 2MASS Point Source, and NVSS catalogs.
- New links to
Cosmology Calculators
and
Extinction Calculators
are available through NED's
Main Menu(Home Page).
- Some of the current review articles now available through
LEVEL5:
A Knowledgebase for Extragalactic Astronomy and Cosmology
include
- Maps of the Cosmos: The Cosmic Microwave Background
by Lyman A. Page (2004)
- The Evolutionary History of Local Group Irregular Galaxies
by Eva K. Grebel (2004)
- Interstellar Dust by B.T. Draine (2004)
- The Interaction of Radio Sources and X-Ray-Emitting Gas in
Cooling Flows by Elisabeth L. Blanton (2004)
- Astrophysical Origins of Ultrahigh Energy Cosmic Rays
by Diego F. Torres & Luis A. Anchordoqui (2004)
- X-Ray Properties of Groups of Galaxies by John S.
Mulchaey (2000)
- An X-Ray View of Radio Sources by D.A. Schwartz (2004)
- Observational Cosmology by R.H. Sanders (2004)
- Dark Matter: Introduction by Martin J. Rees (2004)
- The Evolution of Tidal Debris by J. Christopher Mihos
(2004)
- TASI Lectures: Introduction to Cosmology by Mark
Trodden & Sean M. Carroll (2004)
- Statistical Challenges in Modern Astronomy by E.D.
Feigelson & G.J. Babu (2004)
- Molecular Gas in Spiral Galaxies by Michele D.
Thornley (2004)
- Dark Matter: Early Considerations by Jaan Einasto
(2004)
- Over 130,000 SDSS galaxies with redshifts
- Over 1000 HII regions in nine nearby galaxies including NGC 4395,
NGC 5194, and NGC 6822.
30 June 2003 Revisions
15 May 2003 Revisions
- 1.6 million 2MASS sources and JHK photometry for them from the
2MASS Extended Source Catalog (XSC)
have been added to NED. About 30,000 XSC sources remain to be tied
to existing NED objects.
- 63,500 COMBO-17 objects (Chandra Deep Field area; see
2001A&A...377..442W).
- 27,000 Las Campanas IR Survey objects (Hubble Deep Field South area; see
2002ApJ...570...54C).
- 9,500 galaxies around damped Lyman{alpha} systems (see
2002AJ....123.2206P).
- 7,500 DEEP Groth Strip objects (see 2002ApJS..142....1S
).
- 6,400 galaxies in distant galaxy clusters (see
2002ApJS..142..153S)
- More than 1,300 photometric data points for radio sources and PG QSO's
(see 1988AJ.....95...26G,
1989ApJ...347...29S,
1989ApJS...69..365S,
2000AJ....120..604S, and
2000A&A...354..453H).
- MSX-SPIRIT III infrared images of
M31,
M33,
M83,
M101,
NGC 253,
NGC 4631,
NGC 4945 and
NGC 5055
(see 2002AJ....124.2990K).
14 January 2003 Revisions
- The APM Galaxy Survey (Maddox et al.MNRAS 243, 692, 1990) has been loaded.
The portion of the survey in NED includes about 3.0 million galaxies in
the southern Galactic
hemisphere with b <~ -40 deg, and Dec <~ +2.5 deg; and about 500,000
galaxies in the northern
Galactic hemisphere between RA ~ 9h 30m to ~14h 30m, and Dec
~ +2.5 deg to ~ -7.5 deg.
- 1.3 million sources from NVSS (Condon et al.AJ 115, 1693, 1998) are loaded.
Work continues on the remaining 500,000 sources from this catalog.
- 55,000 sources from WGACAT (
White, Giommi, and Angelini; 2000)) are loaded; work continues on
this catalog, too.
- 40,000 galaxies and QSOs from the SDSS Early Data Release (Stoughton et al.AJ 123, 485, 2002) have been loaded.
- 37,000 redshifts from the 2df Galaxy Redshift Survey (Folkes et al.MNRAS 308, 459, 1999)
have been loaded.
- More than 5,000 HII regions in 13 large, nearby galaxies have also been
loaded.
- OASIS, an image visualization and manipulation tool, is now available
for use with FITS images. Click on the OASIS logo on an image list
page for more information about using OASIS.
- A new version of ALADIN is also available. Again, click on the ALADIN
logo to use the new version and for more information about the new
features.
23 May 2002 Revisions
- The Advanced All-Sky
(formerly "By Parameter") menu provides new capabilities and improvements:
- You may now select samples from NED based on flux density or
magnitude
limits. Photometrically constrained searches can be performed
with optional joint constraints involving redshift, object types,
survey name prefixes, or sky area. Available passbands ranging
from gamma rays through the radio spectrum are conveniently
labeled with standard names, as well as wavelength and frequency
units.
This powerful new tool makes use of the extensive
multiwavelength coverage of over 4.5 million photometric data points
fused in NED (using original and homogenized physical units)
for hundreds of thousands of extragalactic objects.
- A new Index of Constraint Types near the top of the menu is
available to help
you navigate the various search constrain regions.
- New Tutorial Examples
near the top of the menu will set the options to do various example
searches for you.
You may use these as guides to selecting your own sample from NED,
or you may set the constraints yourself.
- There are [Submit Query] buttons in each section of the menu to
minimize the need for scrolling.
- Preformatted text tables are now the default output for most
searches. These substantially speed up data display for searches
that return large numbers of objects. HTML tables, which are easier to
read but slower to display, are still an option.
- The "Output Format Specifications" section of all object query
menus
contains new options to sort by ascending or descending redshift.
- NED's home page format has been adjusted to a more logical layout,
with "Skyplot" and "Batch Jobs" moved to the "Tools" section.
- Photometric and estimated redshifts are now displayed with
the code PHOT or EST, respectively, in the QUAL column of
the basic data display. This will make such non-spectroscopic
redshifts easier to identify.
- In addition to FITS images, NED is now beginning the process of
scanning, archiving, and displaying JPEG images of radio contour plots
(e.g. 3C 019, 3C 022, 3C 206, etc.) and 21-cm neutral hydrogen line
profiles (e.g. UGC 03468, UGC 03578, etc.) extracted from the
published literature. Many sources remain to be identified and scanned
in, but new plots will appear as time and resources permit.
- We have begun loading WGACAT (White, Giommi, and Angelini 2000),
which was assembled from ROSAT PSPC pointed observations. 5500
sources are currently loaded; the remainder will be loaded over
the summer.
- The Tenth (2001) edition of A Catalogue of Quasars and Active
Nuclei by M.-P. Veron-Cetty and P. Veron has been folded into NED
with unique [VCV2001] names attached to each object.
- The Woudt, Kraan-Korteweg catalog of >8,000 Galaxies Behind the
Southern Milky Way (WKK) has been loaded.
- The ROSAT Bright Sample (RBS) catalog has been incorporated.
20 March 2002 Revisions
- 400,000 new photometric data points
- 46,600 additional 2dFGRS objects and redshifts
- 13,000 pointers to 1980-1984 radio literature from the Compendium of
Extragalactic Radio Continuum Observations (CERCO; Gopal-Krishna
et al., 1986)
- 10,000 pointers to pre-1976 literature from RC1 and RC2
- The Carnegie Atlas of Galaxies (images and notes) is now available
in NED
- Several thousand other new images, HI maps, rotation curves,
spectra, etc.
18 December 2001 Revisions
- 37,000 galaxies with redshifts from the 2dF Galaxy Redshift Survey
- 15,000 QSOs with redshifts from the 2dF QSO Redshift Survey
- 250,000 new photometric measurements
- Catalog and name prefix definitions are now available through hyperlinks
in the query reports.
- Photometric data tables and SEDs have been enhanced:
- Data in published units and homogenized units (Jy vs. Hz) are displayed together by default.
- By default SEDs are plotted using a "Fixed data range", meaning a fixed
minimum and maximum in log (frequency) or log (wavelength) on the X axis and
a fixed range of +/- 7 dex centered around the mid-point of the Y axis values.
This has the advantage of maintaining a consistent slope for comparing SEDs.
The "Autoscale data range" option can be selected to replot an SED inside a viewport
computed using only the data values.
- Error bars and point labels can be toggled on or off.
- The SED plots can be clicked to zoom in at a position of interest (in a separate window).
The zoom factor can be set, and the properties (error bars, point labels,
data range, etc.) are inherited from the main plot.
- Postscript versions of the SEDs (full-range and zoomed plots) can be downloaded.
- In the data table, homogenized values are displayed in the same units as selected
for the SED plot axes:
X = log(Freq. [Hz]) or log(Wave [microns]) versus
Y = log(F_nu [Jy]), log(F_nu [W m^-2 Hz^-1]), log(nu*F_nu [Jy-Hz]) , or log(nu*F_nu [W m^-2])
- External Links to the SDSS, UZC, FCSS, and ATNF archives are provided as follows:
- SDSS (spectra and catalog) and UZC (spectra) archive links appear when the object
has a relevant source name (cross-ID).
Examples:
NGC 3720,
NGC 1055, and
NGC 1087
- FCSS spectral archive links appear when the object has an FCSS name (cross-ID).
Examples:
NGC 1392 and
FCC 223
- A link to query the ATNF observation log appears for objects with DEC < +20 degrees.
Examples with ATNF entries:
NGC 1068 and
AM 1925-724 (Super-Antenna).
- External Links to NVSS, MAST and others have been updated to reflect URL changes at the archive centers
- X-ray images from the first eight ROSAT CDs are available
- Selected non-FITS images and scanned maps are now available in NED's image archive.
Examples include images scanned from Arp's
Atlas of Peculiar Galaxies. (Click
here to retrieve a list of all Arp objects from NED.)
24 September 2001 Revisions
- 40,000 galaxies with redshifts from the Sloan Digital Sky Survey
- 4,000 galaxies from the Fornax Cluster Spectroscopic Survey
- 1,200 DENIS galaxies near the Galactic plane
- 400,000 photometric measurements
- 120,000 FITS images
- 43,000 redshifts
Catalogs in progress:
- NVSS (~300,000 out of 1,800,000 sources)
- APMUKS (2,310,000 out of 3,560,000 galaxies)
1 June 2001 Revisions
- More than 520,000 extended sources -- with images -- from the
2MASS
2nd Incremental Release
- More than 60,000 images for extended sources from the
2MASS
1st Incremental Release
- ~18,000 WENSS 325MHz Survey sources
- ~15,000 2QZ (2df QSO Redshift survey) sources
- Updated information for the North and South Hubble Deep Fields
- More than 200,000 references to NED objects from over 2,000 new
papers
12 October 2000 Revisions
NED cited by Nature
as a top ranked database for online astronomy research (October 2000).
- ALADIN IMAGE DISPLAY AND SOURCE OVERLAY TOOL:
Results of queries to NED's image archive now include icons like this
, which when clicked
launch the Aladin Java applet using the specified FITS image.
An example illustrating these links is this retrieval of
FITS images
available for NGC 7469.
This tool allows you to superimpose entries from NED, the USNO catalog
and various other astronomical catalogs, and to interactively access related
data and information for all known objects in the field.
You can also measure interactively positions and distances in celestial coordinates.
Unlike other programs of this nature, Aladin is a Java applet that requires
no download or special installation steps on your computer, just a current
Web browser version that supports Java applets.
The driving motivation behind Aladin is to provide a visual
summary of the multi-wavelength sky. Aladin was developed by
François Bonnarel and Pierre Fernique and is configured with the NED interface
through a cooperative agreement between NED and the CDS.
More information about Aladin
is available at the CDS.
- Associations:New extragalactic sources and data for previously known sources are
becoming available at an ever increasing rate and in larger numbers than
ever before. In an effort to make large numbers of sources from new large-scale
sky surveys accessible as soon as possible, NED now includes
objects in complex regions where secure cross-identifications
with objects already in NED have not yet been fully established. These relations are
referred to as Associations, to distinguish them from the majority of
relations in NED that have secure cross-identifications.
Links to association information, when available, are listed
in the Assoc column and in the links located next to the DSS image
cutout in the Essential Data reports. An example with links leading to association data is provided with this
By Name search on
APMUKS(BJ) B003425.77-334949.0; these association data can also be viewed directly
here.
The information includes separations, position angles, and
goodness-of-fit parameters from the process of correlating the positional uncertainty
ellipses of the new object with those of nearby objects already in NED.
More information is available in the
Association Search Results Help.
- Improved links to objects referenced in papers:
Abstract pages include links (top and bottom) to search the database for all objects referenced
in the paper; these links now indicate the number of objects involved. An example abstract is
here,
where you can Retrieve 173 NED objects in this paper.
- Improved alignment of pre-formatted text used in the HTML
reports from queries containing large result sets.
18 April 2000 Revisions
Welcome to the NASA/IPAC Extragalactic Database (NED).
This is the tenth release of NED's World Wide Web-based interface.
Changes since the previous release:
Search results now include convenient links to several other on-line image,
catalog, and observing log services. Available resources include
- Mission archives at
- IRSA (2MASS, IRAS, MSX),
- MAST (HST, IUE, EUVE, etc.),
- HEASARC (HEAO, GINGA, EXOSAT, EINSTEIN, XTE, ROSAT, etc.),
- Object and catalog data at CDS (SIMBAD and VizieR),
- As well as IMPrESS (GSFC, ADF/ADC),
- NVSS and FIRST (NRAO),
- The VLA Observation Log,
- Astrobrowse (HEASARC)
and several other services. For more information, see
External Links.
22 March 2000 Revisions
This is the ninth release of NED's World Wide Web-based interface.
Changes since the previous release:
- The option of having a frames-based version of the WEB interface;
- The Text Search
option now searches the thesis abstracts in NED, as well as the journal
abstracts and LEVEL5;
- Individual reset buttons are now available on most data input pages;
- Fast preformatted text output is now the default for
By Parameter
object searches; HTML formatted tables are a selectable option;
- The Name Prefix selection lists have been updated to include many
new catalogs;
- "Quick-pick" option buttons/bars have been added for the two common
equinoxes (B1950.0 and J2000.0), and for the name prefixes of NED's
largest catalogs;
- The first input box of each form is pre-selected so that you no
longer have to click to begin typing in that box;
- A list of Web Links to
selected Internet sites is now included for easier access
to astronomical services related to NED.
17 December 1999 Revisions
This is the eighth release of NED's World Wide Web-based interface.
Changes since the previous release include a
Text Search option, implementation of the
Schlegel et al. foreground Galactic extinction for display on the
object search results pages and in the coordinate calculator, and a link to the
LEVEL5 Extragalactic Knowledgebase.
The fifth release inaugurated the use of the Informix Database Manager on
upgraded Sun UltraSPARC servers at IPAC. Most users should see shorter
database search times, though network transmission times will still be
a major factor in NED's apparent speed.
Return to NED's What's New Page.
|