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

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 $4215\mathring{\mathrm{A}}$ (or $2200\mathring{\mathrm{A}}$) for both radio-loud quasars (RLQs) and radio-quiet quasars (RQQs) at $z\le 3.2$, 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 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, 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.

14 pages, 12 figures, 6 Tables, Accepted for publication in Research in Astronomy and Astrophysics

References in corpus (12)

• A Catalog of Quasar Properties from SDSS DR7
• The X-ray Properties of the Most-Luminous Quasars from the Sloan Digital Sky Survey
• Roma-BZCAT: A multifrequency catalogue of Blazars
• The 5th edition of the Roma-BZCAT. A short presentation
• Cosmic X-ray Surveys of Distant Active Galaxies: The Demographics, Physics, and Ecology of Growing Supermassive Black Holes
• The Last of FIRST: The Final Catalog and Source Identifications
• The black hole fundamental plane: revisit with a larger sample of radio and X-ray emitting broad-line AGNs
• The black hole fundamental plane from a uniform sample of radio and X-ray emitting broad line AGNs
• Investigation on Young radio AGNs based on SDSS spectroscopy
• AGN Coronae Through A Jet Perspective
• XMMFITCAT: The XMM-Newton spectral-fit database
• The composite X-ray spectrum of 3CRR Quasars

Cited by in corpus (5)

• The X-ray spectral and variability properties of typical radio-loud quasars
• The intrinsic X-ray luminosity distribution of an optically-selected SDSS quasar population
• Exploring the Connection between UV/Optical Variations and Radio Emission in Radio-Quiet Quasars: Clues on Radio Emission Origin
• Constraining X-ray emission of magnetically arrested disk (MAD) by radio-loud AGNs with extreme ultraviolet (EUV) deficit
• X-ray emission of radio-loud quasar SDSS J121426.52+140258.9: independent variations between optical/UV and X-ray emission