Long-Term Soft X-Ray Variability of Active Galaxies. I. Mrk 926 |
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Authors: | Chulhee Kim Th Boller |
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Institution: | (1) Department of Earth Science Education, Chonbuk National University, Chonju, 561-756, (South) Korea;(2) Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, D-85748 Garching, Germany |
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Abstract: | We present a detailed analysis of the soft X-ray (0.1–2.4 keV) emission of the Seyfert 1 galaxy Mrk 926 in order to investigate
its long-term variation. The X-ray data were obtained from the ROSAT-PSPC archives. The light curves show a gradual decrease
of brightness for a time scales of 36months with the exception of a single flare event superimposed on the gradual variation
of brightness. The light variations for three different energy bands and the hardness ratios were investigated to search for
correlations; no correlation was confirmed. In order to compare spectral variations during the flare event with other periods,
the spectral parameters were determined. Results of our analysis are discussed within the framework of the accretion disk
phenomenon.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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