RASS/SDSSAGN ivo://nasa.heasarc/rassdssagn NASA/GSFC HEASARC Anderson et al. 2026-05-08 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov AGN This table contains further results of a program aimed at yielding ~ 10<sup>4</sup> fully characterized optical identifications of ROSAT X-ray sources. The program employs X-ray data from the ROSAT All Sky Survey (RASS) and both optical imaging and spectroscopic data from the Sloan Digital Sky Survey (SDSS). RASS/SDSS data from 5740 deg<sup>2</sup> of sky spectroscopically covered in SDSS Data Release 5 (DR5) provide an expanded catalog of 7000 confirmed quasars and other active galactic nuclei (AGN) that are probable RASS identifications. Again, in this expanded catalog the identifications as X-ray sources are statistically secure, with only a few percent of the SDSS AGNs likely to be randomly superposed on unrelated RASS X-ray sources. Most identifications continue to be quasars and Seyfert 1 galaxies with 15 < m < 21 and 0.01 < z < 4, but the total sample size has grown to include very substantial numbers of even quite rare AGN, e.g., it now includes several hundreds of candidate X-ray-emitting BL Lac objects and narrow-line Seyfert 1 galaxies. In addition to exploring rare subpopulations, such a large total sample may be useful when considering correlations between the X-ray and the optical and may also serve as a resource list from which to select the ``best'' object (e.g., the X-ray-brightest AGN of a certain subclass at a preferred redshift or luminosity) for follow-up X-ray spectral or alternate detailed studies. Much more information on the SDSS is available at the project's web site at <a href="http://www.sdss.org/">http://www.sdss.org/</a>. This table was created by the HEASARC in February 2007 based on the combination of the electronic versions of tables 1 through 6 from the above reference which were obtained from the electronic AJ website. It replaces a previous version containing the results presented by Anderson et al. (2003, AJ, 126, 2209) which were based on a cross-correlation of the RASS with optical data from very early on in the SDSS program, e.g., extending back to the 'Early Data Release' before SDSS photometric calibrations were complete. This is a service provided by NASA HEASARC . 2003AJ....126.2209A https://heasarc.gsfc.nasa.gov/W3Browse/all/rassdssagn.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=rassdssagn& GET text/xml 180 99999 true 0.93845833 -11.13847222 0.0333333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=rassdssagn GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_rassdssagn&Action=More+Options&Action=Parameter+Search&ConeAdd=1 SDSS 0.0333333333333333 Optical X-ray public rassdssagn ROSAT All-Sky Survey and SDSS DR5 Sample of X-Ray Emitting AGN name SDSS Optical Counterpart Designation meta.id char nullable rass_name RASS X-Ray Source 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 rmag SDSS r* Band PSF Magnitude mag phot.mag;em.opt.R double nullable redshift Redshift from the SDSS Spectra src.redshift double nullable rass_count_rate RASS 0.1-2.4keV Count Rate (ct/s) ct/s phot.count;em.X-ray.soft 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 rass_exposure RASS Exposure Time (s) s time.duration;obs.exposure short nullable object_type Flag Indicates 1=Broad-Line AGN, 2=Narrow-Emission AGN, 3=BL Lac Candidate src.class short nullable bii Galactic Latitude degree pos.galactic.lat double nullable rass_hardness_ratio_1 RASS Hardness Ratio 1 phot.count;arith.ratio;em.X-ray double nullable optical_morphology Optical Morphology src.class.starGalaxy short nullable zmag SDSS z* Band PSF Magnitude mag phot.mag;em.opt double nullable umag SDSS u* Band PSF Magnitude mag phot.mag;em.opt.U double nullable rass_flux RASS Absorbed 0.1-2.4keV Flux erg/s/cm^2 phot.flux;em.X-ray.soft double nullable rass_corr_flux RASS Absorbed 0.1-2.4keV Flux Corrected for Galactic Absorption erg/s/cm^2 phot.flux;em.X-ray.soft double nullable lii Galactic Longitude degree pos.galactic.lon double nullable comments Additional Comments meta.note char nullable imag SDSS i* Band PSF Magnitude mag phot.mag;em.opt.I double nullable gmag SDSS g* Band PSF Magnitude mag phot.mag;em.opt double nullable log_lx_broad Log of Broadband 0.1-2.4keV X-Ray Luminosity in Units of erg/s log(erg/s) phys.luminosity;em.X-ray.soft double nullable log_lx_2kev Log of Monochromatic X-ray Luminosity at 2keV in Units of erg/s/Hz log(erg/s/Hz) phys.luminosity;em.X-ray.soft double nullable log_l_opt Log of Monochromatic Optical Luminosity at 2500 Angstroms in Units of erg/s/Hz log(erg/s/Hz) phys.luminosity;em.opt double nullable alpha_ox Slope of a Hypothetical Power Law from 2500 Angstroms to 2keV spect.index;em.opt;em.X-ray double nullable g0mag SDSS g*0 Band PSF Magnitude mag phot.mag;em.opt double nullable rass_detect_likelihood Source Detection Likelihood stat.likelihood short nullable rass_hardness_ratio_2 RASS Hardness Ratio 2 phot.count;arith.ratio;em.X-ray double nullable