X-Ray Archival Data Analysis of Time Variabilities in Seyfert Galaxy MCG--2-58-22

Astronomy and Astrophysics – Astronomy

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Galaxies: Individual (Mcg--2-58-22), Galaxies: Nuclei, Galaxies: Seyfert, X-Rays: Galaxies

Scientific paper

We report results from an analysis of the X-ray archival data on MCG--2-58-22 obtained with Ginga, ROSAT and ASCA. By analyzing both short- and long-term light curves, we find clear time variations, ranging widely from ~ 1E+3 s to more than several years, in the X-ray energy range 0.1-10 keV. In addition, a flare is detected in 1991, overlaid on a gradual, secular flux decrease from 1979 to 1993; this flare has a time scale of about 1 year, and the X-ray flux increased by at least a factor of 3. The implications of these observational results are discussed in terms of accretion flow dynamics near a supermassive black hole.

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