Exploring X-ray and radio emission of type 1 AGN up to z ~ 2.3

Abstract

X-ray emission from AGN is dominated by the accretion disk around a SMBH. The radio luminosity, however, has not such a clear origin except in the most powerful sources where jets are evident. The origin (and even the very existence) of the local bi-modal distribution in radioloudness is also a debated issue. By analysing X-ray, optical and radio properties of a large sample of type 1 AGN up to z>2, where the bulk of this population resides, we aim to explore the interplay between radio and X-ray emission in AGN, in order to further our knowledge on the origin of radio emission, and its relation to accretion. We analyse a large (~800 sources) sample of type 1 AGN and QSOs selected from the 2XMMi X-ray source catalogue, cross-correlated with the SDSS DR7 spectroscopic catalogue, covering a redshift range from z~0.3 to z~2.3. SMBH masses are estimated from the Mg II emission line, bolometric luminosities from the X-ray data, and radio emission or upper limits from the FIRST catalogue. Most of the sources accrete close to the Eddington limit and the distribution in radioloudness does not appear to have a bi-modal behaviour. We confirm that radioloud AGN are also X-ray loud, with an X-ray-to-optical ratio up to twice that of radioquiet objects, even excluding the most extreme strongly jetted sources. By analysing complementary radio-selected control samples, we find evidence that these conclusions are not an effect of the X-ray selection, but are likely a property of the dominant QSO population. Our findings are best interpreted in a context where radio emission in AGN, with the exception of a minority of beamed sources, arises from very close to the accretion disk and is therefore heavily linked to X-ray emission. We also speculate that the RL/RQ dichotomy might either be an evolutionary effect that developed well after the QSO peak epoch, or an effect of incompleteness in small samples.

Accepted for publication in A&A; 16 pages, 5 tables, 10 figures; tables 3-5 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/

References in corpus (15)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• A Catalog of Quasar Properties from SDSS DR7
• An Observational Determination of the Bolometric Quasar Luminosity Function
• The X-ray-to-Optical Properties of Optically-Selected Active Galaxies Over Wide Luminosity and Redshift Ranges
• Radio-Loudness of Active Galactic Nuclei: Observational Facts and Theoretical Implications
• The XMM-Newton Serendipitous Survey. V. The Second XMM-Newton Serendipitous Source Catalogue
• Piecing Together the X-ray Background: Bolometric Corrections for Active Galactic Nuclei
• The X-ray Properties of the Most-Luminous Quasars from the Sloan Digital Sky Survey
• On the X-ray, optical emission line and black hole mass properties of local Seyfert galaxies
• The Radio-Loud Fraction of Quasars is a Strong Function of Redshift and Optical Luminosity
• The X-ray and Radio Connection in Low-luminosity Active Nuclei
• Are Optically-Selected Quasars Universally X-Ray Luminous? X-Ray/UV Relations in Sloan Digital Sky Survey Quasars
• Mass Functions of the Active Black Holes in Distant Quasars from the Sloan Digital Sky Survey Data Release 3
• Exploring X-ray and radio emission of type 1 AGN up to z ~ 2.3
• The NIR to UV continuum of radio loud vs. radio quiet quasars

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