SDSSWHLGC ivo://nasa.heasarc/sdsswhlgc NASA/GSFC HEASARC Wen et al. 2026-05-08 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Cluster of Galaxies Clusters of galaxies in most of the previous catalogs have redshifts z <= 0.3. Using the photometric redshifts of galaxies from the Sloan Digital Sky Survey Data Release 6 (SDSS DR6), the authors identify 39,716 clusters in the redshift range 0.05 < z < 0.6 with more than eight luminous (M_r <= -21) member galaxies. Cluster redshifts are estimated accurately with an uncertainty of less than 0.022. The contamination rate of member galaxies is found to be roughly 20%, and the completeness of member galaxy detection reaches ~90%. Monte Carlo simulations show that the cluster detection rate is more than 90% for massive (M_200 > 2 x 10<sup>14</sup> M_sun, where M_200 is the total mass within the radius in which the mean mass density is 200 times the critical cosmic mass density) clusters of z <= 0.42. The false detection rate is ~5%. The authors obtain the richness, the summed luminosity, and the gross galaxy number within the determined radius for identified clusters. They are tightly related to the X-ray luminosity and temperature of the clusters. Cluster mass is related to the richness and summed luminosity with M_200 ~ R<sup>(1.90+/-0.04)</sup> and M_200 ~ L_r<sup>(1.64+/-0.03)</sup>, respectively. In addition, 790 new candidate X-ray clusters are found by cross-identification of these clusters with the source list of the ROSAT X-ray All-Sky Survey. This table was created by the HEASARC in August 2009 based on electronic versions of Tables 1 and 2 from the paper which were obtained from the Astrophysical Journal web site. This is a service provided by NASA HEASARC . 2009ApJS..183..197W https://heasarc.gsfc.nasa.gov/W3Browse/all/sdsswhlgc.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=sdsswhlgc& GET text/xml 180 99999 true 1.715 -11.21805556 0.0833333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=sdsswhlgc GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_sdsswhlgc&Action=More+Options&Action=Parameter+Search&ConeAdd=1 SDSS 0.0833333333333333 Optical X-ray public sdsswhlgc Sloan Digital Sky Survey DR6 Galaxy Clusters Catalog name Source Designation meta.id;meta.main char nullable xray_name Designation of X-Ray Source meta.id.cross char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable redshift Photometric Redshift of Cluster src.redshift double nullable rmag_bcg BCG r Band Magnitude mag phot.mag;em.opt.R double nullable num_galaxies Number of Member Galaxy Candidates in 1 Mpc meta.number short 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 rband_luminosity Summed r Band Cluster Luminosity (in Units of Solar Luminosity) Solar_Luminosity phys.luminosity;em.opt.R double nullable cluster_richness Cluster Richness src.class.richness double nullable dec_bcg Declination of the Brightest Cluster Galaxy degree pos.eq.dec double nullable gross_galaxy_num Gross Galaxy Number meta.number double nullable overdensity_level Overdensity Level of Cluster meta.number;arith.ratio double nullable projected_offset Projected X-Ray Source and Cluster BCG Separation Mpc pos.angDistance;em.opt;em.X-ray.soft double nullable other_catalogs Other Catalogs Containing the Cluster meta.ref char nullable bii Galactic Latitude degree pos.galactic.lat double nullable spect_redshift BCG Spectroscopic Redshift of Cluster src.redshift double nullable rass_count_rate X-Ray Cluster 0.1-2.4 keV Band Count Rate ct/s phot.count;em.X-ray.soft double nullable galaxy_det_radius Radius of Member Galaxy Detection (Mpc) Mpc phys.size.radius double nullable ra_bcg Right Ascension of the Brightest Cluster Galaxy degree pos.eq.ra double nullable lii Galactic Longitude degree pos.galactic.lon double nullable