Welcome to the NASA/IPAC Extragalactic Database (NED)
April 2015 Release Highlights
User Interface Upgrades
The new user interface contains the following advances:
A smart box on the main screen greatly simplifies
common queries using a single entry point. You can enter an object name,
an object name and search radius, coordinates and search radius, a refcode,
or a ticket number (to check the status of a ByParameters search request).
Most standard input formats for celestial coordinates are supported.
A new form to Search for Images by Object
Name provides a response in the new interface style and paves the
way for new functionality under development.
Cross-IDs and New Objects
324,187 sources from the literature cross-identified with NED objects
38,712 new NED objects
References and Object Pointers
- 1,682 new references
441,720 new object links (pointers) to references
Featured Additions to Objects and Basic Data
9,900 new parts of galaxies (HII regions, globular clusters,
planetary nebulae) from 68 different journal articles
74 new supernovae published through Dec 2014
4,381 galaxies from
WINGS-SPE. III. Equivalent width measurements, spectral properties, and
evolution of local cluster galaxies
(Fritz, J. et al.
428 galaxies and radio sources from
Radio-Optical Reference Frame Link Using the U.S. Naval Observatory
Astrograph and Deep CCD Imaging
(Zacharias, N. & Zacharias, M. I.
1,515 galaxies from
Tracing the Mass Growth and Star Formation Rate Evolution of Massive
Galaxies from z ~ 6 to z ~ 1 in the Hubble Ultra-Deep Field
(Lundgren, Britt F. et al.
528 X-ray sources in the field of MESSIER 031 from
Around 200 New X-Ray Binary IDs from 13 yr of Chandra Observations of the
(Barnard, R. et al.
1,158 galaxies from
Mapping Compound Cosmic Telescopes Containing Multiple Projected
(Ammons, S. Mark et al.
2,478 galaxies in the field of ABELL 0383 from
A Redshift Survey of the Strong-lensing Cluster Abell 383
(Geller, Margaret J. et al.
1,258 giant molecular clouds from
The PdBI Arcsecond Whirlpool Survey (PAWS): Environmental Dependence of
Giant Molecular Cloud Properties in M51
(Colombo, Dario et al.
4,199 2XLSSd X-ray sources from
Classification and environmental properties of X-ray selected point-like
sources in the XMM-LSS field
(Melnyk, et al
2,123 objects around 6 galaxy clusters from
The Contribution of Halos with Different Mass Ratios to the Overall Growth
of Cluster-sized Halos
(Lemze, et al.
1,778 galaxies from
Faint Tidal Features in Galaxies within the Canada-France-Hawaii Telescope
Legacy Survey Wide Fields
(Atkinson, et al.
1,544 millimeter sources from
Extragalactic Millimeter-wave Point-source Catalog, Number Counts and
Statistics from 771 deg^2^ of the SPT-SZ Survey
(Mocanu, et al.
1,796 more NEP objects from
Hectospec and Hydra Spectra of Infrared Luminous Sources in the AKARI
North Ecliptic Pole Survey Field
(Shim, Hyunjin et al.
2,190 more WHL galaxy clusters from
Substructure and dynamical state of 2092 rich clusters of galaxies derived
from photometric data
(Wen, Z. L. & Han, J. L.
808 PiGSS radio sources from
The Allen Telescope Array Pi GHz Sky Survey. III. The ELAIS-N1, Coma, and
Lockman Hole Fields
(Croft, Steve; Bower, Geoffrey C.; & Whysong, David
4,869 QSOs from
The large area KX quasar catalogue - I. Analysis of the photometric
redshift selection and the complete quasar catalogue
(Maddox, Natasha et al.
2,976 XDEEP2 X-ray sources from
The Chandra X-Ray Point-source Catalog in the DEEP2 Galaxy Redshift Survey
(Goulding, A. D. et al.
1,597 images from
Optical imaging for the Spitzer Survey of Stellar Structure in
Galaxies. Data release and notes on interacting galaxies
(Knapen,Johan H. et al.
14 cubes from
PINGS: the PPAK IFS Nearby Galaxies Survey
(Rosales-Ortega, F. F. et al.
727 spectra from
2MTF III. HI 21 cm observations of 1194 spiral galaxies with the Green
(Masters et al.
654 spectra from
Uncertainties in 21 centimeter redshifts. I - Data
(Tifft, W. G. and Cocke, W. J.
551 spectra from
A southern sky survey of the peculiar velocities of 1355 spiral
(Mathewson et al.
314 spectra from
A study of the large-scale structure in the distribution of galaxies
centered about the Cancer cluster. I. II.
(Bicay et al.
269 spectra from
H I 21 centimeter observations and I-band photometry of spiral
galaxies behind the Virgo Cluster and toward its antipode
(Lu et al.
Plus 2,160 spectra from 28 publications.
The following table gives NED's current total holdings:
|Data Type ||Total|
|Unprocessed Sources ||515,235,015 |
|Distinct Objects ||214,734,542 |
|Multiwavelength Cross-IDs ||255,139,776 |
|Object Associations ||1,413,595|
|Publication Abstracts ||70,623|
|Object Links to References ||32,408,074|
|Photometric Data Points ||1,969,546,956|
|Objects with Redshifts ||5,198,941|
|Redshift-Independent Distances ||83,878|
|Objects with Redshift-Independent Distances||17,020|
|Objects with Detailed Classifications||229,792|
|Detailed Object Notes ||75,221|
New User Interface and New Approach for Data Integration
The NED user interface has begun a transition to a new, more modern style. This new interface
may be previewed here. Drop down menus may be used to quickly access
searches for objects, data, or literature. Clicking one of these options will lead to the classic,
familiar search forms for services that have not yet adopted the new style. Searches By (or Near)
Object Name, Near Position, and by RefCode (Reference Code) may be typed directly into a prominently
featured smart box. The following search forms are available in the new style:
NED has implemented a new methodology for integrating data from both very large
catalogs (VLCs) containing hundreds of millions of sources, and smaller datasets from the literature.
There is a new user interface to Search Objects and Unprocessed Catalog Sources,
with an option to include incoming catalog sources that have not yet been cross-identified and had their
key parameters fused with other information in NED.
The current release provides access to 471 million catalog sources from the 2MASS
Point Source Catalog (2MASS PSC), 42 million catalog sources from the Spitzer Source List (SSTSL2),
and 1.6 million catalog sources from the WIde-field nearby Galaxy-cluster survey (WINGS).
Over 62 million catalog sources from the GALEX All Sky Survey Catalog (GASC) and the GALEX
Medium Imaging Survey Catalog (GMSC) have already been cross-identified with NED objects or
promoted to new NED objects.
In the past, cross-identifications between
incoming catalog sources and objects in NED were
integrated incrementally over many months as the results
from cross-matching software were vetted and loaded into the database in
chunks spanning across multiple NED updates.
This had the disadvantage that only a fraction of catalog sources
were accessible in NED until the catalogs were fully processed, and
it was not clear exactly what subsets were in NED at any given time.
In the new approach, selected parameters (columns) for all catalog sources (rows)
are rapidly loaded into a new Catalog Source Representation layer of the database
and made available for optional inclusion in search results
along with the fully integrated NED objects. A detailed discussion of
the ontology of unprocessed catalog sources (Status=S) versus NED objects (Status=O)
may be found here.
Introduction to NED has more details about all of NED's
services, and NED's Features
gives a brief overview of NED.
The NED History page has
previous NED news.