Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jkas...34..129c&link_type=abstract
Journal of the Korean Astronomical Society, vol. 34, no. 3, pp. 129-135
Astronomy and Astrophysics
Astronomy
3
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.
Choi Chul-Sung
Dotani Tadayasu
Fletcher Andre
Kim Chul-Hee
Yi Insu
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