Searching for Evidence of Tidal Disruption Event in Long-Term X-Ray Light Curve of Seyfert Galaxy MCG-2-58-22

Details Searching for Evidence of Tidal Disruption Event in Long-Term X-Ray Light Curve of Seyfert Galaxy MCG-2-58-22 Searching for Evidence of Tidal Disruption Event in Long-Term X-Ray Light Curve of Seyfert Galaxy MCG-2-58-22

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002chee.conf...59c&link_type=abstract

CURRENT HIGH-ENERGY EMISSION AROUND BLACK HOLES . Proceedings of the 2nd KIAS Astrophysics Workshop. Held 3-8 September 2001 in

Astronomy and Astrophysics

Astrophysics

Scientific paper

Stars can be captured or tidally disrupted by the supermassive black hole in galactic nuclei. It has long been thought that the tidal disruption of stars by a supermassive black hole can result in flare-like activity in the central regions of active galactic nuclei (AGNs) and even in normal galaxies, which occurs on a timescale of years. We report that MCG-2-58-22 (Mrk926) shows such a variability in the X-ray band. Long term variability of X-ray emission of active galactic nuclei and normal galactic centeres is of an interest in study dramatic phenomena expected from exotic processes such as a tidal disruption of a star passing-by a supermassive black hole. In this paper we present a long-term X-ray light curve (2-10 keV) of the bright Seyfert 1 galaxy MCG-2-58-22 by compiling data from various X-ray satellites, which covers more than 20 years. We find that two distinct time variations are displayed in the light curve. One is a gradual and secular decrease of the X-ray flux has a timescale of several ten years, and the other is abrupt increases of X-ray flux by a factor of 2 - 4 compared with the flux level of gradual change parts. We detected 3 flares in total; a possible duration is ~ 2 years and an interval ~ 6 - 8 years. We discuss possible origins of these variabilities. Though a standard disk instability theory may explain a displayed time variability in X-ray light curve, the subsequent accretions of stellar debris of the tidal disruption event due to the supermassive black hole in MCG-2-58-22 cannot be ruled out as an alternative explanation.

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