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(Latest Revision: 2 December 2013)

May 2013 - September 2013 Revisions

Best Practices for Data Publication

In the process of continuously streamlining the integration of data from the literature into NED and at the urging of the NED Users Committee (NUC) chaired by Prof. Michael Strauss (Princeton University), the NED Team has prepared and published on this website a new document titled Best Practices for Data Publication to Facilitate Integration into NED: A Reference Guide for Authors (Schmitz, M. et al. 2013).

This Best Practices document includes a convenient Checklist of recommendations with links to sections of the main document that provide further examples, explanation and rationale. The current version is a revision based on recent vetting and comments provided by the NUC, the AAS Director of Publishing Dr. Chris Biemesderfer, and Journals Scientist Dr. Greg Schwartz. The document is undergoing further review by the Copy Editors and science editors on the AAS Editorial Board. We hope that journal publishers will incorporate links to this document in their Instructions to Authors to provide a practical reference for authors, referees, and science editors so as to help avoid various pitfalls that often impede the interpretation of data and metadata, and also delay their integration into NED, SIMBAD, ADS and other systems.

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.

New and Improved Functionality

The Search for Objects By Parameters service has the following major upgrades:
  • A new NED Backgrounding with Automated Scheduling and Queuing (NBASQ) system supports long-running database searches with 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.
  • Since the results are often too large for viewing in HTML format in a web browser, the default output format has been changed to a plain text file with bar-separated values that can be easily parsed with a computer program or read into a spreadsheet program.
  • The search form has been redesigned to fit on a single page when initially (re)loaded. Form sections to input different types of search constraints and output options can be expanded or collapsed as needed.

New Approach for Very Large Catalogs - Beta Version

NED is implementing a new methodology for integrating data from very large catalogs (VLCs) containing tens or hundreds of millions of sources. 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 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 sources (rows) in a VLC are rapidly loaded into a new "Source Representation" layer of the database and made available for optional inclusion in search results along with the fully integrated NED objects. The initial release will provide access to 40 million sources from the GALEX All-Sky Survey Source Catalog (GASC) and 22 million sources from the GALEX Medium Imaging Survey Catalog (GMSC).

There will be a new user interface to query NED By Position ("cone search") with an option to include incoming catalog sources which have not yet been cross-identified and had their key parameters fused with other information in NED. If you are interested in beta testing NED's new approach for handling VLCs and providing us with your feedback, please contact the NED team.

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
    Unique Objects 62,606 177,234,420
    Publication Abstracts 1,795 64,434
    References 2,319 89,423
    Object Links to References 1,241,586 28,805,122
    Multiwavelength Cross-IDs 427,539 192,568,131
    Object Associations 1,612 1,402,403
    Photometric Data Points 390,249 1,746,428,206
    Objects with Redshifts 40,451 4,195,018
    Redshift-Independent Distances 4,889 69,293
    Objects with Redshift-Independent Distances2,08715,494
    Objects with Detailed Classifications13,780 229,792
    Images 1,838 2,727,103
    Spectra 15,897 494,104
    Detailed Object Notes 153 72,290

Highlights of Latest Additions to Objects and Basic Data

  • Over 114,000 GAMA sources from Galaxy and Mass Assembly (GAMA): survey diagnostics and core data release (Driver, S. P. et al. 2011MNRAS.413..971D)
  • Over 54,000 AMIGA sources around KIG galaxies from The AMIGA sample of isolated galaxies. IV. A catalogue of neighbours around isolated galaxies (Verley, S. et al. 2007A&A...470..505V)
  • Over 17,000 radio sources in SDSS from High-resolution Very Large Array Imaging of Sloan Digital Sky Survey Stripe 82 at 1.4 GHz (Hodge, J. A. et al. 2011AJ....142....3H)
  • About 16,000 AGC sources from The Arecibo Legacy Fast ALFA Survey: The {alpha}.40 H I Source Catalog, Its Characteristics and Their Impact on the Derivation of the H I Mass Function (Haynes, M. P. et al. 2011AJ....142..170H)
  • Over 13,000 AGNs in the Extended-Chandra Deep Field-South and Extended Groth Strip from Supermassive Black Hole Growth in Starburst Galaxies over Cosmic Time: Constraints from the Deepest Chandra Fields (Rafferty, D. A. et al. 2011ApJ...742....3R)
  • About 8,000 sources from The Hubble Space Telescope GOODS NICMOS Survey: overview and the evolution of massive galaxies at 1.5< z< 3 (Conselice, C. J. et al. 2011MNRAS.413...80C)
  • Over 4,000 CLASH sources from The Cluster Lensing and Supernova Survey with Hubble: An Overview (Postman, M. et al. 2012ApJS..199...25P)
  • Supernovae through July 2013 from IAU Central Bureau for Astronomical Telegrams (CBATs)
  • GRBs through April 2013 from Swift GRB lists

Highlights of Latest Additions to Photometry

  • X-ray: 17,207 sources with Chandra 0.3-8 keV fluxes from Chandra ACIS Survey of X-ray Point Sources in 383 Nearby Galaxies. I. The Source Catalog (Liu, J. 2011ApJS..192...10L)
  • UV: 62,522 sources with 1700 A fluxes from A strong redshift dependence of the broad absorption line quasar fraction (Allen, J. T. et al. 2011MNRAS.410..860A)
  • Visual: 71,604 sources with LCO B, R magnitudes from Probing the IGM/Galaxy Connection. IV. The LCO/WFCCD Galaxy Survey of 20 Fields Surrounding UV-bright Quasars (Prochaska, J. X. et al. 2011ApJS..193...28P)
  • NIR: 8,865 sources with UKIDSS YJHK magnitudes from SPIDER - I. Sample and galaxy parameters in the grizYJHK wavebands (La Barbera, F. et al. 2010MNRAS.408.1313L)
  • Sub-mm: 37 sources with fluxes from A LABOCA survey of submillimeter galaxies behind galaxy clusters (Johansson, D. 2011A&A...527A.117J)
  • Radio: 1,623 sources with VLA 1.4 GHz fluxes from Variable and Transient Radio Sources in the FIRST Survey (Thyagarajan, N. et al. 2011ApJ...742...49T)

Highlights of Latest Additions to Classifications

  • 1,080 unique attributes applied to 4,800 NGC and IC galaxies from Notes in the Reference Catalogue of Bright Galaxies (RC1) (de Vaucouleurs, G. & de Vaucouleurs, A. 1964RC1...C...0000d)
  • 14,034 visually determined Hubble Types for SDSS galaxies from A Catalog of Detailed Visual Morphological Classifications for 14,034 Galaxies in the Sloan Digital Sky Survey (Nair, P. B. & Abraham, R. G. 2010ApJS..186..427N)
  • 68,234 types of direct distances in Attributes have been synchronized with NED-D

Latest Images

  • 229 integrated H I, velocity field, velocity dispersion, and individual channel maps from THINGS: The H I Nearby Galaxy Survey (Walter, F. et al. 2008AJ....136.2563W)
  • 329 channel maps, moment maps, velocity-flux profiles, and surface gas density profiles from Little Things (Hunter, D. A. et al. 2012AJ....144..134H)
  • 1278 Herschel SPIRE and PACS images from KINGFISH -- Key Insights on Nearby Galaxies: A Far-Infrared Survey with Herschel: Survey Description and Image Atlas (Kennicutt, R. C. et al. 2011PASP..123.1347K)

Latest Spectra

  • 15,855 spectra from The Arecibo Legacy Fast ALFA Survey: The {alpha}.40 H I Source Catalog, Its Characteristics and Their Impact on the Derivation of the H I Mass Function (Haynes, M. P. et al. 2011AJ....142..170H)
  • 16 spectra from PINGS: the PPAK IFS Nearby Galaxies Survey (Rosales-Ortega, F. F. et al. 2010MNRAS.405..735R)
  • 8 spectra from Twenty-one centimeter line widths of galaxies (Roberts, M. S. 1978AJ.....83.1026R)
  • 3 spectra from Detection of a long H I plume emerging from NGC 3628 (Rots, A. H. 1978AJ.....83..219R)
  • 6 spectra from The giant spiral galaxy M 101. III - Integral properties of several companion galaxies (Allen, R. J. et al. 1978A&A....64..359A)
  • 4 spectra from Observations of neutral hydrogen in early-type galaxies (Bieging, J. H. 1978A&A....64...23B)
  • 2 spectra from The H I content of the elliptical galaxies NGC 3904 and 4636 (Bottinelli, L. & Gouguenheim, L. 1977A&A....60L..23B)
  • 1 spectrum from A neutral hydrogen study of the spiral galaxy NGC 4736 (Bosma, A. et al. 1977A&A....57..373B)
  • 1 spectrum from A 21-cm study of the Seyfert galaxy NGC 4151 (Bosma, A. et al. 1977A&A....57...97B)
  • 8 spectra from H I in early-type galaxies. III. Observations of S0 galaxies (Balick, B. et al. 1976ApJ...209..710B)
  • 9 spectra from H I in early-type galaxies. I - Observations (Gallagher, J. S. et al. 1975ApJ...202....7G)

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

January 2013 - April 2013 Revisions

New and Improved Functionality

  • Foreground Galactic extinction values (Aλ [mag]) based on Schlafly et al. 2011 are now computed using the latest version of the Schlegel et al. 1998 dust maps and code available at http://www.astro.princeton.edu/~schlegel/dust/.
  • New capability to return foreground Galactic extinction values (Aλ [mag]) from Schlafly et al. 2011 in up to 88 photometric bands in the Customized Output feature of the Build Data Table from Input List tools (By Name and Near Name/Position), and in the By Classifications query form.
  • Corrections were made to the logic for By Parameters (All-Sky) searches. These bug fixes improve searches involving constraints on multiple object types and searches excluding particular name prefixes.
  • The results of Photometric Data searches have been revised such that when Fν in Jansky [Jy] or [W m-2 Hz-1] units are selected for homogenized flux density values derived by NED, these only apply to broad-band photometric measurements; homogenized spectral line measurements are now given in their proper integrated flux units of [Jy Hz] or [W m-2].
  • Notice of Discontinuing Services: Server Mode (nedsrv) soon to be replaced with web services.

Database Contents

The following table gives statistics for data added to NED since the previous public update and total NED holdings:

    Data Type Added Total
    Unique Objects 310,514 177,171,814
    Publication Abstracts 1,401 62,639
    References 3,167 87,104
    Object Links to References 1,672,995 27,563,536
    Multiwavelength Cross-IDs 1,708,218 192,140,592
    Object Associations 1,766 1,400,791
    Photometric Data Points 77,594 1,746,037,957
    Objects with Redshifts 133,971 4,154,567
    Redshift-Independent Distances 225 64,404
    Objects with Redshift-Independent Distances013,407
    Objects with Detailed Classifications6,750 216,012
    Images 27,071 2,725,265
    Spectra 317 478,207
    Detailed Object Notes 522 72,137

Highlights of Latest Additions to Objects and Basic Data

Highlights of Latest Additions to Photometry

Latest Images

  • 26,748 images in the u, g, r, i, and z bands for a sample of 4458 PGC galaxies from the EFIGI catalogue. Baillard et al. 2011A&A...532A..74B
  • 122 images from an H I/Optical Atlas of Isolated Galaxies. D. J. Pisano, Eric M. Wilcots and Charles T. Liu. 2002ApJS..142..161P

Latest Spectra

  • 192 spectra from GHASP: an H-alpha kinematic survey of 203 spiral and irregular galaxies - VII. Epinat et al. 2008MNRAS.390..466E
  • 44 spectra from Comparison of AGN and Nuclear Starburst Activity in Seyfert 1 and 2 Galaxies Based on Near-Infrared 2-4 micron Spectroscopy. Oi et al. 2010PASJ...62.1509O
  • 45 spectra from An H I study of Scd galaxies. Shostak, G. 1975ApJ...198..527S
  • 36 spectra from Observations of Neutral Hydrogen in Bright Southern Galaxies. Whiteoak, J. B., and Gardner, F. F. 1977AuJPh..30..187W

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

October 2012 - December 2012 Revisions

Notice of Discontinuing Services: Server Mode (nedsrv) soon to be replaced with web services.

Database Contents

The following table gives statistics for data added to NED since the previous public update and total NED holdings:

    Data Type Added Total
    Unique Objects 8,184 176,861,300
    Publication Abstracts 676 61,238
    References 348 83,937
    Object Links to References 39,765 25,890,541
    Multiwavelength Cross-IDs 51,504 190,432,374
    Object Associations -8 1,399,025
    Photometric Data Points 22,013,9071,745,960,363
    Objects with Redshifts 893 4,020,596
    Redshift-Independent Distances 20,878 64,179
    Objects with Redshift-Independent Distances2,88813,407
    Objects with Detailed Classifications1123 209,262
    Images 733 2,698,194
    Spectra 110 477,890
    Detailed Object Notes 913 71,615

Highlights of Latest Additions to Objects and Basic Data

Highlights of Latest Additions to Photometry

Latest Images

  • 610 images from MIPS 24-160 micron photometry for the Herschel-SPIRE Local Galaxies Guaranteed Time Programs. Bendo, G. J.; Galliano, F.; Madden, S. C. 2012MNRAS.423..197B
  • 123 images in U,B,V,R,I,Ha,J,H,K bands from Stellar Disks of Collisional Ring Galaxies. Romano, R.; Mayya, Y. D.; Vorobyov, E. I. 2008AJ....136.1259R

Latest Spectra

  • 110 spectra from H I bright Galaxies in the Southern Zone of Avoidance. Henning et al. 2000AJ....119.2686H

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

June-September 2012 Revisions

Notice of Discontinuing Services: Server Mode (nedsrv) to be replaced in 2012 with web services.

SDSS Photometry Updated

The SDSS DR6 asinh magnitudes and SDSS DR5 and DR6 fluxes and uncertainties computed by NED have been updated, as described here. This corrects several issues, including incorrect zero-flux magnitudes and negative flux uncertainties for faint sources.

Database Contents

The following table gives statistics for data added to NED since the previous public update and total NED holdings:

    Data Type Added Total
    Unique Objects 6,361,884176.9 million
    Publication Abstracts 2,328 60,562
    References 2,341 83,589
    Object Links to References 15,100,107 25.9 million
    Multiwavelength Cross-IDs 8,144,260190.4 million
    Object Associations 484 1,399,033
    Photometric Data Points 372,441 1.72 billion
    Objects with Redshifts 25,053 4.02 million
    Redshift-Independent Distances 0 43,301
    Objects with Redshift-Independent Distances 0 10,519
    Images 1 2,697,461
    Spectra 11,650 477,780
    Detailed Object Notes 1,192 70,702

Highlights of Latest Additions to Objects and Basic Data

Highlights of Latest Additions to Photometry

Latest Images

Latest Spectra

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

May 2012 Revisions

Interface Enhancements

January-April 2012 Revisions

Interface Enhancements

Known Issues

  • The flux densities computed by NED from the SDSS asinh magnitudes are incorrect at magnitudes within 2.5 mag of the sky noise limit due to a bug in the application of the softening parameters (all 5 bands). In addition, the zero-point magnitude corrections were incorrectly applied in the derived flux densities computed by NED from the SDSS u and z band magnitudes. The flux densities (and uncertainties) are being recomputed and are scheduled to appear in the next NED release (June 2012). In the mean time, the recommended fix is for users to recalculate the SDSS fluxes from the asinh magnitudes as explained here.

Database Contents

The following data have been added to NED since the previous public update:
  • 1,009,472 Unique Objects (total: 170.5 million unique objects)
  • 1,294,165 Objects Linked to 858 References (total: 10.8 million objects linked to 81,248 references)
  • 1,660,624 Multiwavelength Cross-Identifications between Objects (total: 182.2 million cross-IDs)
  • 494,744 Photometric Measurements (total: 1.72 billion photometric measurements)
  • Redshifts for 242,201 Objects (total: 3.99 million objects with at least one redshift measurement)
  • 1,143 detailed Object Notes (total: 69,510 notes)
  • 342,084 Object Associations (total: 1,398,549 associations)
  • 127,114 Spectra (total: 465,717 spectra)
  • 849 Publication Abstracts (total: 58,234 abstracts)

Highlights include:

Latest review papers in LEVEL 5 Knowledgebase for Extragalactic Astronomy and Cosmology

Highlights of Recent Additions to Photometry

Latest Spectra in NED

September-December 2011 Revisions

Interface Enhancements

Known Issues

  • The flux densities computed by NED from the SDSS asinh magnitudes are incorrect at magnitudes within 2.5 mag of the sky noise limit due to a bug in the application of the softening parameters (all 5 bands). In addition, the zero-point magnitude corrections were incorrectly applied in the derived flux densities computed by NED from the SDSS u and z band magnitudes. The SDSS asinh magnitudes themselves are correct in NED. The flux densities (and uncertainties) are being recomputed and are scheduled to appear in the next NED release (March 2012). In the mean time, the recommended fix is for users to recalculate the SDSS fluxes from the asinh magnitudes as explained here.

Database Contents

The following data have been added to NED since the previous public update:
  • 1,934,583 Unique Objects (total: 169.5 million unique objects)
  • 697,763 Objects Linked to 502 References (total: 9.46 million objects linked to 80,390 references)
  • 2,929,376 Multiwavelength Cross-Identifications between Objects (total: 180.6 million cross-IDs)
  • 62,766 Photometric Measurements (total: 1.72 billion photometric measurements)
  • Redshifts for 242,201 Objects (total: 3.5 million objects with at least one redshift measurement)
  • 8,248 Redshift-Independent Distances for 1,374 objects (total: 43,301 redshift-independent distances for 10,519 objects)
  • 1,017 detailed Object Notes (total: 68,367 notes)
  • 12,929 Object Associations (total: 1,056,465 associations)
  • 2,409 Images (total: 2,697,664 images)
  • 501 Publication Abstracts (total: 57,385 abstracts)

Highlights include:

Latest review papers in LEVEL 5 Knowledgebase for Extragalactic Astronomy and Cosmology

Highlights of Recent Additions to Photometry

Latest Images in NED

  • 2416 MOJAVE 15-GHz Very Long Baseline Array (VLBA) images of a complete flux-density-limited sample of 135 AGNs above declination -20 deg, spanning the period 1994 August to 2007 September from Lister et al. 2009AJ....137.3718L

April-August 2011 Revisions

Interface Enhancements

Database Contents

The following data have been added to NED since the previous public update:
  • 2,869,332 Unique Objects (total: 167.5 million unique objects)
  • 2,131,821 Objects Linked to 1,381 References (total: 8.76 million objects linked to 79,888 References)
  • 4,360,178 Multi-Wavelength Cross-Identifications between Objects (total: 177.6 million cross-IDs)
  • 23,561 Photometric Measurements (total: 1.72 billion Photometric Measurements)
  • Redshifts for 1,286,619 Objects (total: 3.26 million objects with at least one Redshift Measurement)
  • 467 detailed Object Notes (total: 67,350 notes)
  • 37,472 Object Associations (total: 1,043,536 Associations)
  • 726 Images (total: 2,571,905 Images)
  • 47,559 Spectra (total: 339,023 Spectra)
  • 1,371 Publication Abstracts (total: 56,884 abstracts)

Highlights include:

Latest review papers in LEVEL 5 Knowledgebase for Extragalactic Astronomy and Cosmology

Highlights of Recent Additions to Photometry

Latest Images in NED

Latest Spectra in NED

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