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• W2565156713 abstract "Variability in the X-rays is a key ingredient in understanding and unveilingactive galactic nuclei (AGN) properties. In this band flux variations occur onshort time scales (hours) as well as on larger times scales. While short timescale variability is often investigated in single source studies, only fewworks are able to explore flux variation on very long time scales.This workprovides a statistical analysis of the AGN long term X-ray variability. Westudy variability on the largest time interval ever investigated for the 0.2-2keV band, up to $sim 20$ years rest-frame for a sample of 220 sources.Moreover, we study variability for 2,700 quasars up to $sim 8$ yearsrest-frame in the same (soft) band.We build our source sample using the 3XMMserendipitous source catalogue data release 5, and data from ROSAT All SkySurvey Bright and Faint source catalogues. In order to select only AGN we usethe Sloan Digital Sky Survey quasar catalogues data releases 7 and 12.Combining ROSAT and XMM-Newton observations, we investigate variability usingthe structure function analysis which describes the amount of variability as afunction of the lag between the observations.Our work shows an increase of thestructure function up to 20 years. We do not find evidence of a plateau in thestructure function on these long time scales.The increase of the structurefunction at long time lags suggests that variability in the soft X-rays can beinfluenced by flux variations originated in the accretion disk or that theytake place in a region large enough to justify variation on such long timescales." @default.
• W2565156713 created "2017-01-06" @default.
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• W2565156713 date "2017-03-01" @default.
• W2565156713 modified "2023-10-18" @default.
• W2565156713 title "A long term study of AGN X-ray variability. Structure function analysis on a ROSAT-XMM quasar sample" @default.
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