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.

Serafinelli, R., Vagnetti, F., Chiaraluce, E., Middei, R. (2017). The MEXSAS2 Sample and the Ensemble X-ray Variability of Quasars. FRONTIERS IN ASTRONOMY AND SPACE SCIENCES, 4 [10.3389/fspas.2017.00021].

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

Vagnetti, Fausto
Supervision
;
2017-01-01

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
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/05 - ASTRONOMIA E ASTROFISICA
English
Con Impact Factor ISI
http://arxiv.org/abs/1710.01582v1
Serafinelli, R., Vagnetti, F., Chiaraluce, E., Middei, R. (2017). The MEXSAS2 Sample and the Ensemble X-ray Variability of Quasars. FRONTIERS IN ASTRONOMY AND SPACE SCIENCES, 4 [10.3389/fspas.2017.00021].
Serafinelli, R; Vagnetti, F; Chiaraluce, E; Middei, R
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/193308
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