Observations of Spectral and Time Variabilities from MCG-2-58-22
Abstract
We present results from analysis of the X-ray archive data of MCG-2-58-22, acquired with ROSAT from 1991 to 1993 and with ASCA from 1993 to 1997. By analyzing light curves, we find that MCG-2-58-22 shows a clear time variability in X-ray flux. The time scales of the variations range widely from about 1000 s to more than years. Among the variations, a flare-like event overlaid on the gradual flux decrease from 1979 to 1993 is detected. We also find clear time variability of the spectra in the energy range of 0.1 - 2.0 keV. However, the flux variation does not influences on their spectra in the energy range of 2 - 10 keV. The implications of these observational results are discussed in terms of a supermassive black hole model and accretion flow dynamics near the central black hole.
Cite
@article{arxiv.astro-ph/0007195,
title = {Observations of Spectral and Time Variabilities from MCG-2-58-22},
author = {Chul-Sung Choi and Tadayasu Dotani and Insu Yi and ChulHee Kim},
journal= {arXiv preprint arXiv:astro-ph/0007195},
year = {2007}
}
Comments
27 pages and 9 figures, submitted to ApJ