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NASA/IPAC EXTRAGALACTIC DATABASE

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DECEMBER 2023 RELEASE HIGHLIGHTS



DATABASE AND SOFTWARE UPDATES

 * This is the first release based on a major reworking of the NED data system,
   including recent updates to equipment, network, database structure, query
   software, and the user interface (UI).
 * In addition to many upgrades "under the hood", the UI provides streamlined
   results including more compact data presentations and improvements to column
   labeling for Coordinates, Redshifts, and Diameters (more in progress).
 * The Overview tab of an object search result displays the mean
   Redshift-independent Distance and dispersion.
 * In the Redshifts tab, the detection technique and methods are now presented
   in the bottom table of individual redshift measurements.

USER SURVEY

 * We wish to thank everyone who participated in the 2023 NED User Survey (Oct
   18 to Dec 4). The valuable feedback provided deepens our understanding of the
   evolving needs of the community as we continue to expand NED's holdings and
   science functionality.



For further details, please visit Information » Overview » News.

Before submission of your next journal article, please support Open Science and
help streamline integration of data from your publications into NED by referring
to Best Practices for Data Publication in the Astronomical Literature (Chen et
al. 2022).

NED Facilitates GW Counterpart Searches

The NED gravitational wave follow-up (GWF) service is continuing to cross-match
galaxies with LIGO-Virgo-KAGRA (LVK) GW events for the fourth observing run. The
upper panel in the figure above shows candidate host galaxies for neutron star -
black hole (NSBH) merger event LVK S230518H. Recent updates include utilizing a
subset of NED galaxies with additional vetting and characterization: the Local
Volume Sample (NED-LVS; Cook et al. 2023 ). Photometry from all-sky surveys
(GALEX, 2MASS, and AllWISE) are used to derive physical properties and to
estimate the completeness relative to expected local luminosity densities (e.g.,
bottom panel in Figure). See the NED-LVS webpage for more details.



The NASA/IPAC Extragalactic Database (NED) is funded by the
National Aeronautics and Space Administration and operated by the
California Institute of Technology.



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