ROSAT PSPC Catalog of Clusters of Galaxies

ROSAT PSPC Catalog of Clusters of Galaxies ROSAT/Clust. ivo://nasa.heasarc/rosgalclus NASA/GSFC HEASARC Vikhlinin et al. 2026-06-05 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Cluster of Galaxies This is a catalog of 203 clusters of galaxies serendipitously detected in 647 ROSAT PSPC high Galactic latitude pointings covering 158 square degrees. This is one of the largest X-ray-selected cluster samples, comparable in size only to the ROSAT All-Sky Survey sample of nearby clusters (Ebeling et al. 1997). Clusters in the inner 17.'5 of the ROSAT PSPC field of view are detected using the spatial extent of their X-ray emission. Fluxes of detected clusters range from 1.6 x 10-14 to 8 x 10-12 ergs s-1 cm-2 in the 0.5-2 keV energy band. X-ray luminosities range from 1042 ergs s-1, corresponding to very poor groups, to ~5 x 1044 ergs s-1, corresponding to rich clusters. The cluster redshifts range from z = 0.015 to z > 0.5. The catalog lists X-ray fluxes, core radii, and spectroscopic redshifts for 73 clusters and photometric redshifts for the remainder. Of 223 X-ray sources, 203 have been optically confirmed as clusters of galaxies. Of the remaining 20 sources, 19 are likely false detections arising from blends of unresolved point X-ray sources. Optical identifications of the remaining object are hampered by a nearby bright star. Above a flux of 2 x 10-13 ergs s-1 cm-2, 98% of extended X-ray sources are optically confirmed clusters. The number of false detections and their flux distribution are in perfect agreement with simulations. The log N-log S relation for clusters derived from this catalog shows excellent agreement with counts of bright clusters derived from the Einstein Extended Medium Sensitivity Survey and the ROSAT All-Sky Survey. At fainter fluxes, its log N-log S relation agrees with the smaller area WARPS survey. The cluster counts appear to be systematically higher than those from a 50 square degree survey by Rosati et al. This database was created by the HEASARC in December 2001 based on the CDS/ADC catalog J/ApJ/502/558/ (table3.dat). This is a service provided by NASA HEASARC . 1998ApJ...502..558V https://heasarc.gsfc.nasa.gov/W3Browse/all/rosgalclus.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=rosgalclus& GET text/xml 180 99999 true 318.585 -68.01555556 0.05 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=rosgalclus GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_rosgalclus&Action=More+Options&Action=Parameter+Search&ConeAdd=1 GALAXY CATALOG 0.05 X-ray public rosgalclus ROSAT PSPC Catalog of Clusters of Galaxies name Catalog 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 flux Total Unabsorbed X-ray Flux in 0.5-2keV Energy Band erg/cm^2/s phot.flux;em.X-ray.soft double nullable flux_error RMS Uncertainty on Flux erg/cm^2/s stat.error;phot.flux;em.X-ray.soft double nullable core_radius Angular Core Radius arcsec short nullable core_radius_error RMS Uncertainty on Core Radius arcsec short nullable max_redshift Photometric Redshift 90% Confidence Maximum double nullable dss_redshift_flag Flag Indicates Digitized Sky Survey Redshift char nullable lii Galactic Longitude degree pos.galactic.lon double nullable redshift Heliocentric Spectroscopic or Photometric Redshift src.redshift double nullable error_radius 90% X-ray Position Error Circle arcsec stat.error;pos short nullable uncertainty_flag [UF] Uncertain or False Detections char nullable note_flag Flag Indicates Note Detailed in Documentation short nullable min_redshift Photometric Redshift 90% Confidence Minimum double nullable bii Galactic Latitude degree pos.galactic.lat double 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