RASSBSCPGC ivo://nasa.heasarc/rassbscpgc NASA/GSFC HEASARC Zimmermann et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source In a correlation study of the ROSAT All-Sky Survey Bright Source Catalog (RASS-BSC, <a href="https://cdsarc.cds.unistra.fr/ftp/cats/IX/10A">CDS Cat. <IX/10A></a>, the <a href="rassbsc.html">HEASARC table RASSBSC</a>) with the Catalogue of Principal Galaxies (PGC, <a href="https://cdsarc.cds.unistra.fr/ftp/cats/VII/119">CDS Cat. <VII/119></a>, the HEASARC table PGC2003), 904 X-ray sources were found that possess possible extragalactic counterparts within a search radius of 100 arcseconds. A visual screening process was applied to classify the reliability of the correlations. 547 correlations have been quoted as reliable identifications. From these, 349 sources are known to be active galaxies. Although for the other sources no hints for activity were found in the literature, 69% of those for which we have distances show X-ray luminosities exceeding those of normal galaxies, a clear sign that these galaxies also own hitherto unreported X-ray active components. Some objects are located inside or in the direction of a known group or cluster of galaxies. Their X-ray flux may therefore be in part affected by hot gas emission. In the paper, luminosity and log N-log S distributions are used to characterize different subsamples. Nuclei that are both optically and X-ray active are found predominantly in spirals. Two special source samples are defined, one with candidates for X-ray emission from hitherto unknown groups or clusters of galaxies, and one with high X-ray luminosity sources, that are likely candidates to possess hitherto unreported active galactic nuclei. Besides a compilation of X-ray and optical parameters, X-ray overlays on optical images for all the objects are also supplied as part of this work. This table contains 1124 optical galaxy entries for the 904 relevant X-ray candidates/counterparts from the RASS. Besides a compilation of X-ray and optical parameters for each source, the results of an identification screening are also given. The 904 optical images with X-ray overlay contours (xID_nnn.ps.gz) used in the screening process are added for each user's own judgement of the reliability of the associations. This table was created by the HEASARC in March 2012 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/A+A/378/30">CDS catalog J/A+A/378/30</a> file table1.dat, the list of PGC galaxies identified as possible counterparts to RASS Bright Source Catalog X-ray sources. This is a service provided by NASA HEASARC . 2001A&A...378...30Z https://heasarc.gsfc.nasa.gov/W3Browse/all/rassbscpgc.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=rassbscpgc& GET text/xml 180 99999 true 10.2175 -79.24444444 0.0333333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=rassbscpgc GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_rassbscpgc&Action=More+Options&Action=Parameter+Search&ConeAdd=1 GALAXY CATALOG 0.0333333333333333 Optical X-ray public rassbscpgc ROSAT All-Sky Survey Bright Source Catalog/Catalog of Principal rass_name 1RXS Identifier for the 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 error_radius Uncertainty for X-Ray Position arcsec stat.error;pos;em.X-ray.soft int nullable count_rate Count Rate of X-Ray Source ct/s phot.count;em.X-ray.soft double nullable count_rate_error Uncertainty for Count Rate of X-Ray Source ct/s stat.error;phot.count;em.X-ray.soft double nullable name Name of Optical Candidate meta.id;meta.main char nullable pgc_ra Optical Candidate Right Ascension degree double nullable pgc_dec Optical Candidate Declination degree double nullable bmag B Magnitude of Optical Candidate mag phot.mag;em.opt.B double nullable rass_pgc_offset Distance Between X-Ray Object and Optical Candidate arcsec pos.angDistance;em.X-ray;em.opt double nullable class Browse Object Classification src.class short nullable nh_gal Galactic Hydrogen Column Density cm^-2 phys.columnDensity double nullable pgc_candidate_number Number Identifies the Optical Candidate for a Specific X-Ray Source meta.id short nullable radial_velocity Recession Velocity km/s spect.dopplerVeloc double nullable activity_type Type of Activity (Optical) src.class char nullable log_flux Logarithm of X-Ray Flux in the 0.1-2.4keV X-ray Band log(erg/s/cm^2) phot.flux;em.X-ray.soft double nullable xid_number Identification Number of X-Ray Object Related to Image Number meta.id short nullable object_type Type of Optical Candidate src.class char nullable lii Galactic Longitude degree pos.galactic.lon double nullable counts Total Counts from X-Ray Source ct phot;em.X-ray.soft double nullable exposure Exposure Time of X-Ray Source s time.duration;obs.exposure int nullable log_lx Logarithm of X-Ray Luminosity using H_0_=70km/Mpc/s log(erg/s) phys.luminosity;em.X-ray.soft double nullable opt_error_radius Optical Position Uncertainty arcsec stat.error;pos;em.opt double nullable bii Galactic Latitude degree pos.galactic.lat double nullable comments Comments meta.note char nullable detect_likelihood Likelihood of Detection stat.likelihood;em.X-ray.soft short nullable source_number Sequential Identification Number for Each Source in Catalog meta.id;src short nullable extended_likelihood Likelihood that X-Ray Source Is Extended (Interpret with Care!) stat.likelihood;em.X-ray.soft;phys.angSize int nullable detailed_type Detailed Type of Optical Candidate src.class char nullable angular_extent Extent Size arcsec phys.angSize;em.X-ray.soft int nullable cluster_flag Flag Indicates Classification of Cluster meta.code short nullable corr_reliability Reliability of Correlating the X-Ray and Optical Source meta.code 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