Optically Selected Radio-Intermediate and Loud Quasars X-ray Emission Catalog

Optically Selected Radio-Intermediate and Loud Quasars X-ray Emission Catalog OSRILQXRAY ivo://nasa.heasarc/osrilqxray NASA/GSFC HEASARC Miller et al. 2026-10-02 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This catalog contains some of the results of an investigation into the X-ray properties of radio-intermediate and radio-loud quasars (RIQs and RLQs, respectively). The authors have combined large, modern optical (e.g., SDSS) and radio (e.g., FIRST) surveys with archival X-ray data from Chandra, XMM-Newton, and ROSAT to generate an optically selected sample that includes 188 RIQs and 603 RLQs. This sample is constructed independently of X-ray properties but has a high X-ray detection rate (85%); it provides broad and dense coverage of the luminosity-redshift (l-z) plane, including at high redshifts (22% of the objects have z = 2-5), and it extends to high radio-loudness RL values (33% of objects have RL = log(Lr/Lo) = 3 - 5), where Lr and Lo are the rest-frame monochromatic luminosities at 5 GHz and 2500 Angstroms, respectively). The authors measure the "excess" X-ray luminosity of RIQs and RLQs relative to radio-quiet quasars (RQQs) as a function of radio loudness and luminosity, and parametrize the X-ray luminosity of RIQs and RLQs both as a function of optical/UV luminosity and also as a joint function of optical/UV and radio luminosity. RIQs are only modestly X-ray bright relative to RQQs; it is only at high values of radio loudness (RL >~ 3.5) and radio luminosity that RLQs become strongly X-ray bright. This HEASARC table contains the primary sample from the reference paper. The authors consider three categories of quasars in this work: RQQs, RIQs, and RLQs (rather than just RQQs and RLQs), where the define RIQs to consist of objects with 1 <= RL < 2; consequently, the objects they classify as RLQs satisfy RL >= 2. The primary sample contained herein consists of 654 optically selected RIQs and RLQs with SDSS/FIRST observations and high-quality X-ray coverage from Chandra (171), XMM-Newton (202), or ROSAT (281). The primary sample is split nearly evenly between spectroscopic (312) and high-confidence photometric (342) quasars. Most (562) of the primary sample objects possess serendipitous off-axis X-ray coverage, while the remainder (92) were targeted in the observations used in this sample. The X-ray detection fraction for the primary sample is 84%; the detection fraction for those objects with Chandra/XMM-Newton/ROSAT coverage is 95%/92%/70% (typical ROSAT observations are comparatively less sensitive and have higher background). The authors adopt a standard cosmology with H0 = 70 km s-1 Mpc-1, OmegaM = 0.3, and OmegaLambda = 0.7 throughout their study. This table was created by the HEASARC in October 2012 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJ/726/20">CDS Catalog J/ApJ/726/20</a> file table1.dat. This is a service provided by NASA HEASARC . 2011ApJ...726...20M https://heasarc.gsfc.nasa.gov/W3Browse/all/osrilqxray.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=osrilqxray& GET text/xml 180 99999 true 358.3095 -10.68505556 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=osrilqxray GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_osrilqxray&Action=More+Options&Action=Parameter+Search&ConeAdd=1 GALAXY CATALOG 0.0166666666666667 Optical Radio X-ray public osrilqxray Optically Selected Radio-Intermediate and Loud Quasars X-ray Emi name Object Designation (SDSS JHHMMSS.ss+DDMMSS.s) 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 redshift Redshift src.redshift double nullable imag SDSS PSF i-Band Magnitude Corrected for Galactic Absorption mag phot.mag;em.opt.I double nullable log_lr Logarithm of Radio Luminosity log(erg/s/Hz) phys.luminosity;em.radio double nullable log_lo Logarithm of Optical/UV Luminosity log(erg/s/Hz) phys.luminosity;em.UV.200-300nm double nullable log_lx_limit Flag Indicates Upper Limit (95% Confidence) meta.code;phys.luminosity;em.X-ray char nullable log_lx Logarithm of X-Ray Luminosity log(erg/s/Hz) phys.luminosity;em.X-ray double nullable log_lr_lo Radio Loudness phys.luminosity;arith.ratio;em.radio;em.UV.200-300nm double nullable alpha_r Radio Spectral Slope spect.index;em.radio double nullable alpha_ox_limit Flag Indicates Upper Limit (95% Confidence) meta.code;spect.index;em.UV.200-300nm;em.X-ray char nullable alpha_ox Optical/UV-to-X-Ray Spectral Slope, alpha_ox = 0.384*(Logarithm(LX/L)) spect.index;em.UV.200-300nm;em.X-ray double nullable delta_ig_color Object (g-i) Minus Typical (g-i) of Similar z SDSS Quasars mag phot.color;em.opt.B;em.opt.I double nullable log_lr_core Core Radio Luminosity log(erg/s/Hz) phys.luminosity;em.radio double nullable xray_obs_flag X-Ray Coverage Flag meta.code char nullable lii Galactic Longitude degree pos.galactic.lon double nullable sdss_flag Flag [SP] Indicates Optical Selection meta.code char nullable log_lr_core_limit Flag [<] Indicates Core Detection (Not in FIRST Catalog) meta.code;phys.luminosity;em.radio char 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