摘要
We present a study of the X-ray emission for a sample of radio-detected quasars constructed from the cross-matches between SDSS,FIRST catalogs and XMM-Newton archives.A sample of radio-quiet SDSS quasars without FIRST radio detection is also assembled for comparison.We construct the optical and X-ray composite spectra normalized at rest frame 4215 A(or 2200 A)for both radio-loud quasars(RLQs)and radio-quiet quasars(RQQs)at z≤3.2,with matched X-ray completeness of 19%,redshift and optical luminosity.While the optical composite spectrum of RLQs is similar to that of RQQs,we find that RLQs have a higher X-ray composite spectrum than RQQs,consistent with previous studies in the literature.By dividing the radio-detected quasars into radio loudness bins,we find the X-ray composite spectra are generally higher with increasing radio loudness.Moreover,a significant correlation is found between the optical-to-X-ray spectral index and radio loudness,and there is a unified multi-correlation between the radio and X-ray luminosities and radio loudness in radio-detected quasars.These results could be possibly explained with the corona-jet model,in which the corona and jet are directly related.
基金
the National Natural Science Foundation of China(Grant Nos.11873073,U1531245,11773056 and U1831138)
based on results from the enhanced XMMNewton spectral-fit database,an ESA PRODEX funded project,based in turn on observations obtained with XMMNewton,an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA
Funding for SDSS-Ⅲhas been provided by the Alfred P.Sloan Foundation
the National Science Foundation
the U.S.Department of Energy Office of Science。
