The composite X-ray spectra of radio-loud and radio-quiet SDSS quasars
Minhua Zhou, Minfeng Gu

TL;DR
This study compares the X-ray and optical spectra of radio-loud and radio-quiet SDSS quasars, revealing higher X-ray emission in radio-loud quasars and correlations with radio loudness, supporting a corona-jet connection.
Contribution
It provides the first composite X-ray spectra comparison between radio-loud and radio-quiet SDSS quasars, highlighting the relationship with radio loudness and supporting the corona-jet model.
Findings
Radio-loud quasars have higher X-ray emission than radio-quiet quasars.
X-ray spectra increase with radio loudness.
Significant correlation between optical-to-X-ray index and radio loudness.
Abstract
We present the study on 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 (or ) for both radio-loud quasars (RLQs) and radio-quiet quasars (RQQs) at , 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 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…
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