ARXA ivo://nasa.heasarc/arxa NASA/GSFC HEASARC Flesch 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The Atlas of Radio/X-Ray Associations (ARXA) is a compendium of all cataloged or APM/USNO-A optical objects which are found to be associated with XMM-Newton, Chandra, RASS, HRI, PSPC or WGACAT X-ray detections, or with NVSS, FIRST or SUMSS radio detections. All detections are listed, plus double radio lobes where found. The source number counts are: <pre> Optical objects - 602,570. NVSS - 266,148 core associations, plus 8309 double lobes. FIRST - 173,383 core associations, plus 12,844 double lobes. SUMSS - 59,138 core associations, plus 2529 double lobes. XMM associations - 57,778. Chandra associations - 32,951. ROSAT RASS - 47,486. ROSAT HRI - 15,523. ROSAT PSPC - 35,607. WGA - 24,226. </pre> Each optical object is given as one entry in this catalog, containing the sky coordinates, the object name (from the literature where available), APM and USNO-A sourced red and blue photometry, redshift, the source catalogs for the name and redshift, the calculated odds that the object is a quasar, galaxy, star, or erroneous association, and the radio & X-ray identifiers, up to 10 of them possible although usually just 1 or 2. This catalog supersedes the previous similar compilation by the same author, the Quasars.org (QORG) Catalog, called QORGCAT in the HEASARC's Browse (see <a href="http://quasars.org/qorg-data.htm">http://quasars.org/qorg-data.htm</a>). Questions or comments on ARXA may be directed to eric@flesch.org. See also: <pre> APM home page <a href="http://www.ast.cam.ac.uk/~apmcat">http://www.ast.cam.ac.uk/~apmcat</a> USNO-A home page <a href="http://www.nofs.navy.mil/">http://www.nofs.navy.mil/</a> NVSS home page <a href="http://www.cv.nrao.edu/nvss/">http://www.cv.nrao.edu/nvss/</a> FIRST home page <a href="http://sundog.stsci.edu/">http://sundog.stsci.edu/</a> SUMSS home page <a href="http://www.astrop.physics.usyd.edu.au/SUMSS/index.html">http://www.astrop.physics.usyd.edu.au/SUMSS/index.html</a> XMM-Newton home page <a href="http://xmmssc-www.star.le.ac.uk">http://xmmssc-www.star.le.ac.uk</a> HRI & PSPC home page <a href="http://www.mpe.mpg.de/ROSAT/">http://www.mpe.mpg.de/ROSAT/</a> WGA home page <a href="http://wgacat.gsfc.nasa.gov/wgacat/wgacat.html">http://wgacat.gsfc.nasa.gov/wgacat/wgacat.html</a> RASS-FSC home page <a href="http://www.xray.mpe.mpg.de/rosat/survey/rass-fsc">http://www.xray.mpe.mpg.de/rosat/survey/rass-fsc</a> RASS-BSC home page <a href="http://www.xray.mpe.mpg.de/rosat/survey/rass-bsc">http://www.xray.mpe.mpg.de/rosat/survey/rass-bsc</a> Chandra home page <a href="http://chandra.harvard.edu">http://chandra.harvard.edu</a> XAssist home page <a href="http://xassist.pha.jhu.edu/zope/xassist">http://xassist.pha.jhu.edu/zope/xassist</a> (XMMX & CXOX sources are from XAssist) </pre> If using this catalog in published research, please add a small mention in the acknowledgements. This table is based on research which made use of the NASA/IPAC Extragalactic Database (NED) operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. This online catalog was created by the HEASARC in January 2010 based on a machine-readable table obtained from the author's ARXA web site at <a href="http://quasars.org/arxa.htm">http://quasars.org/arxa.htm</a>. This is a service provided by NASA HEASARC . 2010PASA...27..283F https://heasarc.gsfc.nasa.gov/W3Browse/all/arxa.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=arxa& GET text/xml 180 99999 true 267.79583333 -89.88388889 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=arxa GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_arxa&Action=More+Options&Action=Parameter+Search&ConeAdd=1 GALAXY CATALOG 0.0166666666666667 Optical Radio X-ray public arxa Atlas of Radio/X-Ray Associations (ARXA) name Source Identification from the Literature meta.id;meta.main char nullable alt_name Alternative Source Designation meta.id char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable bmag Blue Optical Magnitude mag phot.mag;em.opt.B double nullable rmag Red Optical Magnitude mag phot.mag;em.opt.R double nullable redshift Redshift from the Literature src.redshift double nullable chandra_id Chandra X-Ray Identification, If Any meta.id.assoc;em.X-ray char nullable rass_id ROSAT RASS X-Ray Identification, If Any meta.id.assoc;em.X-ray 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 wga_id WGA X-Ray Identification, If Any meta.id.assoc;em.X-ray char nullable red_psf_flag Flag Indicates Red Optical PSF Class meta.code;instr.det.psf char nullable nvss_id NVSS Radio Identification, If Any meta.id.assoc;em.radio char nullable blue_psf_flag Flag Indicates Blue Optical PSF Class meta.code;instr.det.psf char nullable ref_name Reference Code for the Source Identification from the Literature meta.ref;src char nullable lobe2_id 2nd Radio Lobe Identification, If Any meta.id.assoc;em.radio char nullable lii Galactic Longitude degree pos.galactic.lon double nullable bii Galactic Latitude degree pos.galactic.lat double nullable lobe1_id 1st Radio Lobe Identification, If Any meta.id.assoc;em.radio char nullable false_id_prob Probability That Association Is Erroneous percent stat.probability short nullable star_prob Probability That This Object Is a Star percent stat.probability short nullable hri_id ROSAT HRI X-Ray Identification, If Any meta.id.assoc;em.X-ray char nullable fs_id FIRST or SUMSS Radio Identification, If Any meta.id.assoc;em.radio char nullable pspc_id ROSAT PSPC X-Ray Identification, If Any meta.id.assoc;em.X-ray char nullable xmm_id XMM-Newton X-Ray Identification, If Any meta.id.assoc;em.X-ray char nullable optical_flag Flags Indicate Comments on Optical Object meta.code;em.opt char nullable gal_prob Probability That This Object Is a Galaxy percent stat.probability short nullable class Browse Object Classification src.class short nullable qso_prob Probability That This Object Is a QSO percent stat.probability short nullable ref_redshift Reference Code for the Redshift from the Literature meta.ref;src.redshift char nullable broad_type Broad Classification of Object src.class char nullable