CFAZ ivo://nasa.heasarc/zcat NASA/GSFC HEASARC Huchra et al. 2026-04-03 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Galaxy Redshift The ZCAT database contains the CfA Redshift Catalog, which incorporates much of the latest velocity data from the Whipple Observatory and other sources, as well as velocities from earlier compilations such as the "Second Reference Catalog" of de Vaucouleurs, de Vaucouleurs, and Corwin; the "Index of Galaxy Spectra" of Gisler and Friel; and the "Catalog of Radial Velocities of Galaxies" of Palumbo, Tanzella-Nitti, and Vettolani. It includes BT magnitudes, some UGC numbers, and increased "accuracy" in the velocity source information. The data presented here have primarily been assembled for the purpose of studying the large scale structure of the universe, and, as such, are nearly complete in redshift information, but are not necessarily complete in such categories as diameter, magnitude, and cross-references to other catalogues. The original HEASARC version was constructed based on an earlier version of the catalog and was released on November 15, 1996. The HEASARC created the current version of ZCAT in February 2001 based on CDS/ADC Catalog VII/193, "The CfA Redshift Catalogue", Version June 1995, tables <a href="https://cdsarc.cds.unistra.fr/ftp/cats/VII/193/zcat.dat">https://cdsarc.cds.unistra.fr/ftp/cats/VII/193/zcat.dat</a> and zbig.dat. The former table contains the main body of the CFA Redshift Catalog (57536 objects) and entries from it are distinguishable in the current database by having either listed radial velocity values but not redshifts or neither, while the latter table contains 1202 high-redshift galaxies (distinguishable in the current database by their having listed redshift values but not radial velocities). This is a service provided by NASA HEASARC . https://heasarc.gsfc.nasa.gov/W3Browse/all/zcat.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=zcat& GET text/xml 180 99999 true 25.40675631 -89.33515576 0.0333333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=zcat GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_zcat&Action=More+Options&Action=Parameter+Search&ConeAdd=1 GALAXY CATALOG 0.0333333333333333 Optical public zcat CfA Redshift Catalog (June 1995 Version) ugc_or_eso UGC or ESO Number meta.id char nullable diameter_2 Diameter 2 (arcmin) arcmin phys.angSize;src double nullable morph_type Morphological (T) Type src.morph.type short nullable dec Declination degree pos.eq.dec;meta.main double nullable redshift Redshift src.redshift double nullable rfn_number Plate Number meta.id;obs.field char nullable ref_redshift Reference Code for Redshift meta.code;src.redshift short nullable bii Galactic Latitude degree pos.galactic.lat double nullable radial_velocity_error Radial Velocity Error km/s stat.error;spect.dopplerVeloc;pos.heliocentric short nullable lii Galactic Longitude degree pos.galactic.lon double nullable notes Diameter (arcmin) or Spectrum ID meta.note char nullable "__y_ra_dec" System unit vector column double nullable name Catalog Designation meta.id;meta.main char nullable structure Structure Flag meta.code;src char nullable comments Comments meta.note char nullable bt_mag B_T Magnitude phot.mag;em.opt double nullable class Browse Object Classification src.class short nullable bar_type Bar Type meta.note;src.class char nullable "distance" Distance Determined by Independent Source (Mpc) Mpc pos.distance double nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable "__row" System index column char nullable bmag B Magnitude phot.mag;em.opt.B float nullable ref_radial_velocity Reference Code for Radial Velocity meta.ref;spect.dopplerVeloc;pos.heliocentric short nullable luminosity_class Luminosity Class src.class.luminosity short nullable "__z_ra_dec" System unit vector column double nullable radial_velocity Heliocentric Radial Velocity (km/s) km/s spect.dopplerVeloc;pos.heliocentric int nullable diameter_1 Diameter 1 (arcmin) arcmin phys.angSize;src double nullable "__x_ra_dec" System unit vector column double nullable ref_bmag Reference Code for B Magnitude meta.ref;phot.mag;em.opt.B char nullable