X-ray Emission from Optically Selected Radio-Intermediate and Radio-Loud QuasarsReportar como inadecuado



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


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We present the results of an investigation into the X-ray properties of radio-intermediate and radio-loud quasars RIQs and RLQs, respectively. We combine 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 l-z plane, including at high redshifts 22% of objects have z=2-5, and it extends to high radio-loudness values 33% of objects have R*=3-5, 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 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 R*3.5 and radio luminosity that RLQs become strongly X-ray bright. We find no evidence for evolution in the X-ray properties of RIQs and RLQs with redshift implying jet-linked IC-CMB emission does not contribute substantially to the nuclear X-ray continuum. Finally, we consider a model in which the nuclear X-ray emission contains both disk-corona-linked and jet-linked components and demonstrate that the X-ray jet-linked emission is likely beamed but to a lesser degree than applies to the radio jet. This model is used to investigate the increasing dominance of jet-linked X-ray emission at low inclinations.



Autor: B. P. Miller; W. N. Brandt; D. P. Schneider; R. R. Gibson; A. T. Steffen; Jianfeng Wu

Fuente: https://archive.org/







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