Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
권호 표지

X-RAY ARCHIVAL DATA ANALYSIS OF TIME VARIABILITIES IN SEYFERT GALAXY MCG-2-58-22

  • CHOI CHUL-SUNG (Korea Astronomy Observatory) ;
  • DOTANI TADAYASU (Institute of Space and Astronautical Science) ;
  • YI INSU (School of Physics, Korea Institute for Advanced Study) ;
  • FLETCHER ANDRE (Korea Astronomy Observatory) ;
  • KIM CHULHEE (Department of Earth Science Education, Chonbuk National University)
  • Published : 2001.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

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, $\~10^3$ 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.

Keywords