Hickson(Gal) ivo://nasa.heasarc/hcggalaxy NASA/GSFC HEASARC Hickson, Kindl, Auman; Hickson 2026-05-08 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Galaxy The HCGGALAXY database table is based on the Hickson Catalog of Compact Groups, and contains data on 463 galaxies in 100 compact groups of galaxies that were identified by a systematic search of the Palomar Observatory Sky Survey red prints. Each group contains four or more galaxies, has an estimated mean surface brightness brighter than 26.0 magnitude per arcsec<sup>2</sup> and satisfies an isolation criterion. Astrometry, photometry, and morphological types, derived from CCD images, are presented for the 463 galaxies. Radial velocities are given for 457 of the 463 galaxies: more than 84% of the galaxies measured have radial velocities that are within 1000 km/s of the group median velocity. Morphological information derived from either an isophotal analysis or from a visual inspection of images is given for 210 of the 463 galaxies. This database table essentially contains the information given in Table 2 of Hickson, P. et al. (1989, ApJS, 70, 687), Table 2 of Hickson, P. et al. (1992, ApJ, 399, 353), and Table 2 of Mendes de Oliveira, C. and Hickson, P. (1994, ApJ, 427, 684). Consequently, the information on the properties of the Hickson Compact Groups as units that is also given in some of these references, e.g., in Table 3 of Hickson, P. et al. (1992, ApJ, 399, 353), is not in the HCGGALXY database table; however, the latter data can be found in the related HEASARC database table HCG. This database table was created by the HEASARC in August, 1999, based on machine-readable tables obtained from the ADC/CDS data centers (<a href="https://cdsarc.cds.unistra.fr/ftp/cats/VII/213">CDS catalog VII/213</a>, files galaxies.dat and morpho.dat). The HEASARC added Galactic coordinates and updated the table's metadata in August, 2005. This is a service provided by NASA HEASARC . 1989ApJS...70..687H https://heasarc.gsfc.nasa.gov/W3Browse/all/hcggalaxy.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=hcggalaxy& GET text/xml 180 99999 true 195.53045631 -32.78750503 0.0833333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=hcggalaxy GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_hcggalaxy&Action=More+Options&Action=Parameter+Search&ConeAdd=1 GALAXY CATALOG 0.0833333333333333 Optical public hcggalaxy Hickson Compact Groups of Galaxies (HCG) Individual Galaxies Dat name HCG Catalog Galaxy Designation meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable radial_velocity Heliocentric Radial Velocity (km/s) km/s spect.dopplerVeloc int nullable bmag B Magnitude of Galaxy within the 24.5mag/arcsec^2 Isophote mag phot.mag;em.opt.B float nullable hubble_type Hubble Morphological Type char nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable bt_asympt_mag_error B_T Asymptotic Magnitude Mean Error mag float nullable hcg_galaxy HCG Galaxy Code in Group char nullable comments Comments on Individual Galaxy char nullable diameter_rmag Diameter of R=24.0mag/arcsec^2 Isophote (arcsec) arcsec float nullable morph_type Numeric Morphological Type Code short nullable alt_name2 Alternative Designation 2 char nullable br_color B-R Color within 24.5mag/arcsec^2 Isophote mag float nullable bmag_qual Flag Indicates Confidence in B Magnitude short nullable semi_major_axis Semi-Major Axis at 25.0mag/arcsec^2 Isophote (arcsec) arcsec float nullable alt_name3 Alternative Designation 3 char nullable rmag R magnitude within 24.0mag/arcsec^2 Isophote mag phot.mag;em.opt.R float nullable bt_asympt_mag B_T Asymptotic Magnitude mag float nullable class Browse Object Classification src.class short nullable rmag_qual Flag Indicates Confidence in R Magnitude short nullable lii Galactic Longitude degree pos.galactic.lon double nullable alt_name1 Alternative Designation 1 char nullable abs_bmag Absolute B Magnitude of Individual Galaxy mag float nullable bii Galactic Latitude degree pos.galactic.lat double nullable morph_info Flag [Y] Indicates More Morphology Information in Comments Parameter char nullable semi_minor_axis Semi-Minor Axis at 25.0mag/arcsec^2 Isophote (arcsec) arcsec float nullable radial_velocity_qual Flag Indicates Confidence in Radial Velocity short nullable diameter_bmag Diameter of B=24.5mag/arcsec^2 Isophote (arcsec) arcsec float nullable radial_velocity_error Estimated RMS Uncertainty in Radial Velocity (km/s) km/s stat.error;spect.dopplerVeloc short nullable corr_bt_asympt_mag Extinction-Corrected B_T Asymptotic Magnitude mag float nullable hcg Hickson Compact Group Number short nullable