The composite X-ray spectra of radio-loud and radio-quiet SDSS quasars

作     者：Min-Hua Zhou Min-Feng Gu Min-Hua Zhou;Min-Feng Gu

作者机构：Key Laboratory for Research in Galaxies and CosmologyShanghai Astronomical ObservatoryChinese Academy ofSciences80 Nandan RoadShanghai 200030China University of Chinese Academy of Sciences19A Yuquan RoadBeijing 100049China 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2021年第21卷第1期

页      面：33-44页

核心收录：

学科分类：0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 070401[理学-天体物理] 0704[理学-天文学] 0825[工学-航空宇航科学与技术] 

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。 

主　　题：methods:statistical catalogs quasars:general X-rays:general 

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.