What's New with NED

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(Latest Revision: 14 May 2014)

Welcome to the NASA/IPAC Extragalactic Database (NED)

May 2014 Release

Database Contents

The following table gives NED's current total holdings:

    Data Type Total
    Sources from Very Large Catalogs 493,236,705
    Distinct Objects with Cross-IDs 206,318,572
    Multiwavelength Cross-IDs 232,414,197
    Object Associations 1,413,595
    References 91,600
    Publication Abstracts 66,641
    Object Links to References 30,592,951
    Photometric Data Points 1,891,559,219
    Diameters 608,833,152
    Objects with Redshifts 5,178,966
    Redshift-Independent Distances 72,219
    Objects with Redshift-Independent Distances15,876
    Objects with Detailed Classifications229,792
    Detailed Object Notes 73,732
    Images 2,608,840
    Spectra 553,829

Highlights of Latest Additions to Photometry

  • Radio : 1285 sources with GMRT 325 MHz fluxes from 325-MHz observations of the ELAIS-N1 field using the Giant Metrewave Radio Telescope (Sirothia, S. K. et al. 2009MNRAS.395..269S)
  • UV, Visual and NIR : 4629 sources with HST magnitudes from The Cluster Lensing and Supernova Survey with Hubble: An Overview (Postman, Marc et al. 2012ApJS..199...25P)
  • FUV and NUV : 6953 sources GALEX magnitudes from UV to Far-IR Catalog of a Galaxy Sample in Nearby Clusters: Spectral Energy Distributions and Environmental Trends (Hernandez-Fernandez, Jonathan D. et al. 2012ApJS..199...22H)
  • X-ray : 1873 sources with Fermi 0.1-100 GeV fluxes from Fermi Large Area Telescope Second Source Catalog (Nolan, P.L. et al 2012ApJS..199...31N)

Latest Images

  • 65 images from A Survey of Local Group Galaxies Currently Forming Stars. I. UBVRI Photometry of Stars in M31 and M33 (Massey, P. et al. 2006AJ....131.2478M
  • 30 images from A Survey of Local Group Galaxies Currently Forming Stars. II. UBVRI Photometry of Stars in Seven Dwarfs and a Comparison of the Entire Sample (Massey, P. et al. 2007AJ....133.2393M)
  • 57 images from A Survey of Local Group Galaxies Currently Forming Stars. III. A Search for Luminous Blue Variables and Other H{alpha} Emission-Line Stars (Massey, P. et al. 2007AJ....134.2474M)
  • 52 images from A Deep K-Band Photometric Survey of Merger Remnants (B. Rothberg and R. D. Joseph 2004AJ....128.2098R)
  • 4704 images from The Spitzer Survey of Stellar Structure in Galaxies (S^4^ G) (Sheth, K. et al. 2010PASP..122.1397S)

Latest Spectra

  • 88 spectra from 21 Centimeter Survey of Luminous Infrared Galaxies (Mirabel, I. F. and Sanders, D. B. 1988ApJ...335..104M)
  • 46 spectra from Comparison of AGN and Nuclear Starburst Activity in Seyfert 1 and 2 Galaxies over a Wide Luminosity Range Based on Near-Infrared 2-4 micron Spectroscopy (Oi, N. et al. 2010PASJ...62.1509O)
  • 16 spectra from PINGS: the PPAK IFS Nearby Galaxies Survey (Rosales-Ortega, F. F. et al. 2010MNRAS.405..735R)

NOTE: If you would like to have your FITS image or spectral data become available for use by other researchers via NED, please leave a comment with your name and email address so that we may contact you.

Latest Review Papers in LEVEL 5 Knowledgebase for Extragalactic Astronomy and Cosmology

March 2014 Release

New User Interface

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. The most popular By Name search may be typed directly into a prominently featured query box. Search Objects, With Unprocessed Catalog Sources leads to a new-style interface which gives information on objects in NED and sources from very large catalogs (VLCs) that NED knows about but have not yet been fully integrated into NED (see below). Source Nomenclature leads to a new-style service for looking up source acronyms.

New Approach for Very Large Catalogs

NED has implemented a new methodology for integrating data from very large catalogs (VLCs) containing tens or hundreds of millions of sources. There is a new user interface to Search Objects, With 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) and 22 million catalog sources from the GALEX Medium Imaging Survey Catalog (GMSC). Nearly 40 million catalog sources from the GALEX All Sky Survey Catalog (GASC) 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) in a VLC 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.

Explore Galaxy Environments via Radial Velocity Constrained Cone Searches

The new Search By Environment service gives a view of the environments surrounding objects or positions of interest. A list of objects centered on the requested position and having radial velocities within 5000 km/s and projected distances within 10 Mpc is returned, and the locations of these objects are plotted on position-radial velocity diagrams.

Best Practices for Data Publication

The September 2013 Release published on this website a document titled Best Practices for Data Publication to Facilitate Integration into NED: A Reference Guide for Authors (Schmitz, M. et al. 2013). We encourage authors and referees of journal articles presenting extragalactic data and derived results to refer to these Best Practices while preparing and reviewing data sets and manuscripts before publication. We expect this document will evolve based on additional input from the community, and we welcome everyone interested to please submit your comments for future editions.

Queuing for By Parameters Queries

Long-running queries from the Search for Objects By Parameters service are now managed by queue (starting September 2013). The NED Backgrounding with Automated Scheduling and Queuing (NBASQ) system supports these searches and delivers machine-readable output tables staged on the NED server for download when the search is completed. This service facilitates complex, multi-parameter searches that typicaly require more than a few minutes to complete and often result in very large output tables.

Database Contents

The following table gives statistics for data added to NED since the previous public update, followed by the current total holdings:

    Data Type Added Total
    Sources from Very Large Catalogs 532,806,736 493,236,705
    Multiwavelength Cross-IDs 39,846,066 232,414,197
    Unique Objects 29,084,152 206,318,572
    Object Associations 11,192 1,413,595
    References 788 90,211
    Publication Abstracts 772 65,206
    Object Links to References 1,668,471 30,473,593
    Photometric Data Points 145,107,934 1,891,536,140
    Diameters 0 608,833,152
    Objects with Redshifts 983,948 5,178,966
    Redshift-Independent Distances 1,940 71,233
    Objects with Redshift-Independent Distances274 15,768
    Objects with Detailed Classifications0 229,792
    Detailed Object Notes 1,442 73,732
    Images 180 2,603,933
    Spectra 59,621 553,725

Highlights of Latest Additions to Objects and Basic Data

  • Nearly 471,000,000 2MASS PSC Near-IR Sources from The 2-Micron All Sky Survey Point Source Catalog (Skrutskie, M. F. et al. 2006AJ....131.1163S)
  • Nearly 40,000,000 GALEX ASC (GASC) UV Sources from The GALEX All Sky Catalog (Seibert, M. 2012GASC..C...0000S)
  • About 22,000,000 GALEX MSC (GMSC) UV Sources from The GALEX Medium-Deep Sky Catalog (Seibert, M. 2012GMSC..C...0000S)
  • Over 65,000 COMAi galaxies from The HST/ACS Coma Cluster Survey. II. (Hammer, D. et al. 2010ApJS..191..143H)
  • Over 27,000 more MaxBCG clusters from Robust Optical Richness Estimation with Reduced Scatter (Rykoff, E. S. et al. 2012ApJ...746..178R)
  • Over 21,000 more MUSYC objects from The Multiwavelength Survey by Yale-Chile (MUSYC) (Cardamone, C. N. et al. 2010ApJS..189..270C)
  • Over 12,000 more candidate QSOs and over 1,163,000 photometric redshifts using the NBCKDE (Nonparametric Bayes Classifier Kernel Density Estimate) method from Efficient Photometric Selection of Quasars from the Sloan Digital Sky Survey. II. (Richards, G. T. et al. 2009ApJS..180...67R)
  • Over 2,000 more candidate QSOs behind the LMC from A Refined QSO Selection Method Using Diagnostics Tests (Kim, D.-W. et al. 2012ApJ...747..107K)
  • Over 1,300 new parts of galaxies (HII regions, globular clusters, planetary nebulae) from 13 different journal articles
  • Supernovae through October 2013

Highlights of Latest Additions to Photometry

  • VIS and NIR : 4130 sources with HST multiwavelength magnitudes from Active and Passive Galaxies at z ~ 2: Rest-frame Optical Morphologies with WFC3 (Cameron, E. et al. 2011ApJ...743..146)
  • SUBMM : 153 sources with BLAST 250, 350, and 500 GHz fluxes from Submillimetre observations of galaxy clusters with the BLAST: the star formation activity in Abell 3112 (Braglia, F. G. et al. 2011MNRAS.412.1187B)
  • X-ray : 1948 sources with XMM 0.2-4.5 keV fluxs from The deep XMM-Newton Survey of M 31 (Stiele, H. et al. 2011A&A...534A..55S)
  • Radio : 598 sources with GMRT 153 MHz fluxes from Deep low-frequency radio observations of the NOAO Bootes field. I. Data reduction and catalog construction (Intema, H. T. et al 2011A&A...535A..38I)
  • IR : 7284 sources with AKARI 2-24 microns fluxes from The AKARI NEP-Deep survey: a mid-infrared source catalogue (Takagi, T. et al. 2012A&A...537A..24T)
  • UV : Nearly 40,000,000 sources with GALEX NUV and/or FUV fluxes from The GALEX All Sky Survey Catalog (GASC) (Seibert, M. 2012GASC..C...0000S)

Latest Images

  • 180 images from an atlas of CO emission from 18 nearby galaxies from Heracles: The HERA CO Line Extragalactic Survey (Leroy, A. K. et al. 2009AJ....137.4670L)

Latest Spectra

  • 59,615 spectra from Galaxy and Mass Assembly (GAMA): survey diagnostics and core data release (Driver, S. P. et al. 2011MNRAS.413..971D)

NOTE: If you would like to have your FITS image or spectral data become available for use by other researchers via NED, please leave a comment with your name and email address so that we may contact you.

Latest Review Papers in LEVEL 5 Knowledgebase for Extragalactic Astronomy and Cosmology

The 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.

Return to NED's Home Page.