YITP WORKSHOP ON
Quasi-Periodic Oscillations and Time Variabilities of Accretion Flows
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ABSTRACT

NAME
INSTITUTE
TITLE OF THE TALK
T. Miyakawa
JAXA/The University of Tokyo, Japan
Long Term Iron Line Variability of the Seyfert 1 Galaxy MCG-6-30-15
We have analyzed the data sets of two long observation of the Seyfert 1 galaxy MCG-6-30-15 performed with ASCA and Suzaku, in 1999 and 2006, respectively. We confirmed that the Root Mean Square (RMS) variability in 1999 indicates a significant decrease in the disk-line energy band(5.0---6.6 keV) more rapidly than those in the other energy bands, as time-bin-width increases from $10^{4}$ sec to $10^{5}$ sec, as already reported by Matsumoto et al. (2003). On the other hand, RMS variability in 2006 does not show such a rapid decrease in the disk-line energy band, which is explained with a simple two-component model such that normalization of the power-law component is variable and the disc reflection component is constant. On the other hand, the energy dependent variability in 1999 cannot be explained by this model, but is required to introduce a variable warm absorber with the typical variation time scale longer than that of the continuum(Inoue and Matsumoto 2003).
In this talk, we apply the warm absorber model by Inoue and Matsumoto (2003) to the 2006 data, and examine if the MCG-6-30-15 RMS spectra could be explained without introducing the disk line model.


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