Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543315m&link_type=abstract
American Astronomical Society, AAS Meeting #215, #433.15; Bulletin of the American Astronomical Society, Vol. 42, p.372
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the results of an investigation into the optical-to-X-ray properties of radio-intermediate and radio-loud quasars (RIQs and RLQs, respectively). We combine large, modern optical (SDSS) and radio (FIRST) surveys with high-quality archival X-ray data from Chandra, XMM-Newton, and ROSAT to generate an optically selected sample that includes 150 RIQs and 450 RLQs. This sample is constructed independently of X-ray properties but has a high X-ray detection rate of 80%, and it extends to high redshifts (25% of objects have z>2) and radio-loudness values (25% of objects have R*>3, using logarithmic units). We 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 parameterize the X-ray luminosity of RIQs and RLQs as a sole function of optical/UV luminosity and as a joint function of optical/UV and radio luminosity (including separate fits conducted on subsamples of RLQs grouped by radio-loudness, radio luminosity, and radio spectral slope). The X-ray properties of RIQs are quite similar to those of RQQs, and it is only at high values of radio-loudness and luminosity that RLQs become strongly X-ray bright. Finally, we determine the relative degree of disk/corona-linked X-ray emission and of jet-linked X-ray emission in RIQs and RLQs through comparison to simulated samples, and quantify the increasing dominance of jet-linked X-ray emission at low inclinations.
Brandt Wiliam N.
Gibson Robert R.
Miller Brendan P.
Schneider David P.
Steffen Aaron T.
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