QuasarOrg ivo://nasa.heasarc/qorgcat NASA/GSFC HEASARC Flesch, Hardcastle 2026-04-03 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Optical Counterpart The Quasars.org (QORG) Catalog is an all-sky optical catalog of radio/X-ray sources. The QORG Catalog aligns and overlays the year 2001/2 releases of the ROSAT HRI, RASS, PSPC and WGA X-ray catalogs, the NVSS (2002), FIRST (2003) and SUMSS (2003) radio catalogs, the Veron QSO catalog (2003) and various galaxy/star reference catalogs onto the optical APM and USNO-A catalogs. This catalog displays calculated percentage probabilities for each optical, radio/X-ray associated object of its likelihood of being a quasar, galaxy, star, or erroneous radio/X-ray association. This table contains the main Master QORG catalog (master.dat) and contains all 501,756 radio/X-ray associated optical objects and known quasars which are optically detected in APM/USNO-A. Up to six radio/X-ray catalog identifications are presented for each optical object, plus any double radio lobes (21,498 of these). These are superimposed (and laterally fitted) onto a 670,925,779-object optical background which combines APM and USNO-A data. Other subsets of this master catalog are available at the CDS, including the Free-Lunch catalog, a concise easy-to-read variant of the Master catalog showcasing just one X-ray and/or radio identification for each object, a subset catalog of QSO candidates, and a subset catalog of known QSOs/galaxies/stars. Objects presented in this catalog are those optical APM/USNO-A objects which are associated with X-ray/radio detections, or any optically-found catalogued QSO/AGN/Bl Lac objects, which have confidence levels >40% of being radio/X-ray emitting optical objects. There are 501,756 objects included in all (including 48,285 catalogued quasars), representing the 99.4% coverage of the sky which is available from the APM and USNO-A. Each object is shown as one entry giving the position in equatorial coordinates, red and blue optical magnitudes (recalibrated) and PSF class, calculated probabilities of the object being, separately, a quasar, galaxy, star, or erroneous radio/X-ray association, any radio identification from each of the NVSS, FIRST and SUMSS surveys, including candidate double-lobe detections, any X-ray identification from each of the ROSAT HRI, RASS, PSPC and WGA surveys, including fluxes and field shifts of those identifications, plus, if already catalogued, the object name and redshift where applicable. The QORG catalog and supporting data can be accessed from the catalog home page at <a href="http://quasars.org/qorg-data.htm">http://quasars.org/qorg-data.htm</a> Questions or comments on the catalog contents may be directed to the first author Eric Flesch at eric@flesch.org. The authors request that researchers using this catalog make a small acknowledgement of such use in any published papers which thereby result. This table was created by the HEASARC in November 2004 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/A+A/427/387">CDS Catalog J/A+A/427/387</a> file master.dat.gz. This is a service provided by NASA HEASARC . 2004A&A...427..387F https://heasarc.gsfc.nasa.gov/W3Browse/all/qorgcat.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=qorgcat& GET text/xml 180 99999 true 79.24583333 -89.74083333 0.0333333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=qorgcat GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_qorgcat&Action=More+Options&Action=Parameter+Search&ConeAdd=1 GALAXY CATALOG 0.0333333333333333 X-ray public qorgcat All-Sky Optical Catalog of Radio/X-Ray Sources star_prob Confidence (As Above) That Object Is a Star percent short nullable fs_id Identification from the FIRST or SUMSS Radio Catalog char nullable rass_count_rate Count Rate of the RASS Source (ct/s) ct/s double nullable rass_optical_offset Distance from RASS Detection to Optical Object (arcsecs) arcsec short nullable rmag_flag Flag Indicates Red Optical Magnitude Upper Limit char nullable wga_field_dec_shift Declination Arcsecs of the WGA Field Shift (arcsecs) arcsec short nullable rmag_psf_type Red Optical PSF Class char nullable nvss_optical_conf Confidence That This Is a True Association percent short nullable dec Declination degree pos.eq.dec;meta.main double nullable "__row" System index column char nullable hri_field_id HRI Field Identification of This Detection char nullable gal_prob Confidence (As Above) That Object Is a Galaxy percent short nullable hri_id Identification from the ROSAT HRI Survey char nullable rass_field_id RASS Field Identification of This Detection char nullable rass_id Identification from the ROSAT All-Sky Survey (RASS) char nullable nvss_radio_flux Flux of the NVSS Source (mJy) mJy int nullable hri_count_rate Count Rate of the HRI Source (ct/s) ct/s double nullable pspc_count_rate Count Rate of the PSPC Source (ct/s) ct/s double nullable wga_optical_offset Distance from WGA Detection to Optical Object (arcsecs) arcsec short nullable wga_count_rate Count Rate of the WGA Source (ct/s) ct/s double nullable sky_density_bin Sky Density Bin of This Sky Location K int nullable "__x_ra_dec" System unit vector column double nullable wga_field_ra_shift R.A. Arcsecs of the WGA Field Shift (arcsecs) arcsec short nullable fs_optical_offset Distance from FIRST/SUMSS Detection to Optical (arcsecs) arcsec short nullable name Quasars.org Source Designation meta.id;meta.main char nullable wga_id Identification from the WGA (PSPC Data) Catalog char nullable hri_optical_pa Angle (N Through E) from Optical Object to Detection (degrees) degree short nullable wga_optical_conf Confidence That This Is a True Association percent short nullable lobe1_id FIRST/NVSS Identification of a Radio Lobe for This Object char nullable pspc_id Identification from the ROSAT PSPC Survey char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable fs_optical_pa Angle (N Through E) from Optical Object to Detection (degrees) degree short nullable rass_optical_pa Angle (N Through E) from Optical Object to Detection (degrees) degree short nullable bmag Blue Optical Magnitude mag phot.mag;em.opt.B float nullable false_id_prob Probability That This Is a False Association percent short nullable bmag_psf_type Blue Optical PSF Class char nullable bii Galactic Latitude degree pos.galactic.lat double nullable wga_field_id WGA Field Identification of This Detection char nullable pspc_optical_pa Angle (N Through E) from Optical Object to Detection (degrees) degree short nullable lobe2_radio_flux Flux of This Lobe Source (mJy) mJy int nullable lobe2_central_offset Distance from Lobe Detection to Central Object (arcsecs) arcsec short nullable hri_optical_offset Distance from HRI Detection to Optical Object (arcsecs) arcsec short nullable fs_optical_conf Confidence That This Is a True Association percent short nullable lobe1_central_pa Angle (N Through E) from Central Object to This Lobe (degrees) degree short nullable pspc_field_ra_shift R.A. Arcsecs of the PSPC Field Shift (arcsecs) arcsec short nullable pspc_optical_conf Confidence That This Is a True Association percent short nullable wga_optical_pa Angle (N Through E) from Optical Object to Detection (degrees) degree short nullable lobe2_central_pa Angle (N Through E) from Central Object to this Lobe (degrees) degree short nullable pspc_field_id PSPC Field Identification of This Detection char nullable bmag_flag Flag Indicates Blue Optical Magnitude Upper Limit char nullable hri_optical_conf Confidence That This Is a True Association percent short nullable id_type Nature of Object and Any Association char nullable lobe1_radio_flux Flux of This Lobe Source (mJy) mJy int nullable hri_field_ra_shift R.A. Arcsecs of the HRI Field Shift (arcsecs) arcsec short nullable lobe2_id FIRST/NVSS Identification of Radio Lobe #2 for This Object char nullable nvss_optical_pa Angle (N Through E) from Optical Object to Detection (degrees) degree short nullable "__z_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable lobe1_central_conf Confidence That This Is a True Association percent short nullable rmag Red Optical Magnitude mag phot.mag;em.opt.R float nullable alt_name Alternative Designation from the Literature, Where Existing meta.id char nullable rass_field_ra_shift R.A. Arcsecs of the RASS Field Shift (arcsecs) arcsec short nullable ref_redshift Source Catalog of Redshift Value char nullable pspc_optical_offset Distance from PSPC Detection to Optical Object (arcsecs) arcsec short nullable rass_optical_conf Confidence That This Is a True Association percent short nullable lobe1_central_offset Distance from Lobe Detection to Central Object (arcsecs) arcsec short nullable hri_field_dec_shift Declination Arcsecs of the HRI Field Shift (arcsecs) arcsec short nullable rass_field_dec_shift Declination Arcsecs of the RASS Field Shift (arcsecs) arcsec short nullable nvss_optical_offset Distance from NVSS Detection to Optical Object (arcsecs) arcsec short nullable optical_note Comment on Optical Object char nullable pspc_field_dec_shift Declination Arcsecs of the PSPC Field Shift (arcsecs) arcsec short nullable nvss_id Identification from the NVSS Radio Catalog char nullable lobe2_central_conf Confidence That This Is a True Association percent short nullable lii Galactic Longitude degree pos.galactic.lon double nullable redshift Redshift from the Literature src.redshift double nullable ref_alt_name Source Catalog of Name Identification char nullable qso_prob Confidence that the Radio/X-Ray Association Shows This Object to Be a Quasar percent short nullable fs_radio_flux Flux of the FIRST or SUMSS Source mJy int nullable