We present the second Multi-Epoch X-ray Serendipitous AGN Sample (MEXSAS2), extracted from the 6th release of the XMM Serendipitous Source Catalogue (XMMSSC-DR6), cross-matched with Sloan Digital Sky Survey quasar catalogues DR7Q and DR12Q. Our sample also includes the available measurements for masses, bolometric luminosities, and Eddington ratios. Analyses of the ensemble structure function and spectral variability are presented, together with their dependences on such parameters. We confirm a decrease of the structure function with the X-ray luminosity, and find a weak dependence on the black hole mass. We introduce a new spectral variability estimator, taking errors on both fluxes and spectral indices into account. We confirm an ensemble softer when brighter trend, with no dependence of such estimator on black hole mass, Eddington ratio, redshift, X-ray and bolometric luminosity.

The MEXSAS2 Sample and the Ensemble X-ray Variability of Quasars / Serafinelli, Roberto; Vagnetti, Fausto; Chiaraluce, Elia; Middei, Riccardo. - In: FRONTIERS IN ASTRONOMY AND SPACE SCIENCES. - ISSN 2296-987X. - ELETTRONICO. - 4:(2017). [10.3389/fspas.2017.00021]

The MEXSAS2 Sample and the Ensemble X-ray Variability of Quasars

Serafinelli, Roberto;
2017

Abstract

We present the second Multi-Epoch X-ray Serendipitous AGN Sample (MEXSAS2), extracted from the 6th release of the XMM Serendipitous Source Catalogue (XMMSSC-DR6), cross-matched with Sloan Digital Sky Survey quasar catalogues DR7Q and DR12Q. Our sample also includes the available measurements for masses, bolometric luminosities, and Eddington ratios. Analyses of the ensemble structure function and spectral variability are presented, together with their dependences on such parameters. We confirm a decrease of the structure function with the X-ray luminosity, and find a weak dependence on the black hole mass. We introduce a new spectral variability estimator, taking errors on both fluxes and spectral indices into account. We confirm an ensemble softer when brighter trend, with no dependence of such estimator on black hole mass, Eddington ratio, redshift, X-ray and bolometric luminosity.
2017
04 Pubblicazione in atti di convegno::04c Atto di convegno in rivista
The MEXSAS2 Sample and the Ensemble X-ray Variability of Quasars / Serafinelli, Roberto; Vagnetti, Fausto; Chiaraluce, Elia; Middei, Riccardo. - In: FRONTIERS IN ASTRONOMY AND SPACE SCIENCES. - ISSN 2296-987X. - ELETTRONICO. - 4:(2017). [10.3389/fspas.2017.00021]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1080399
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