26-30 June 2023
Centro Congressi Federico II
Europe/Rome timezone

X-ray variability of SDSS quasars

26 Jun 2023, 18:15
Aula Magna (Centro Congressi Federico II)

Aula Magna

Centro Congressi Federico II

Via Partenope, 36, Napoli, Italy
Contributed talk X-ray continuum variability


Prof. Guido Risaliti (Università di Firenze)


I present the analysis of a sample of several hundred SDSS quasars with multiple serendipitous XMM-Newton observations. The X-ray to UV luminosity relation allows to predict the average X-ray flux, and to select only the X-ray observations that are deep enough to remove any bias towards higer-than-average flux states. The optical/UV SDSS spectrum allows to investigate the relation between X-ray variability and the total luminosity, the black hole mass, and the Eddington ratio. Considering that the optical/UV and X-ray observations are not correlated, I conclude that most of the "intrinsic" dispersion of the X-ray to UV relation is due to X-ray variability.

Primary authors

Prof. Guido Risaliti (Università di Firenze) Ms. Matilde Signorini (Università di Firenze) Dr. Elisabeta Lusso (Università di Firenze) Dr. Emanuele Nardini (INAF-Arcetri Observatory)

Presentation Materials

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