Other
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.0824e&link_type=abstract
American Astronomical Society, HEAD meeting #11, #8.24; Bulletin of the American Astronomical Society, Vol. 41, p.666
Other
Scientific paper
We have investigated spectral variation of the Seyfert 1 galaxy MCG-6-30-15 observed with Suzaku in January 2006. We have found a clear correlation between the intensity in the 6 -- 10 keV band and the spectralratio of 0.5 -- 3.0 keV/6.0-- 10 keV. Such a spectral variation requires change of the apparent slope of the direct component. We have also analyzed the Chandra HETG data taken in May 2004 to study absorption line features in detail. We have extracted the ``bright spectrum''and the ``faint spectrum'' from the periods when the source flux was brighter and fainter than the average, respectively. We have found that the bright and faint spectra are fitted with common photon index, while only the power-law normalization and the absorption line depths are varied. The change of the absorption line depths is naturally explained by change of the ionization degree of the photoinozied warm absorber, responding to the incoming flux change. Furthermore, if we introduce another warm absorber which partially covers the central engine, variation of the partial covering factor explains most of the observed flux/spectral variation. Taking account of these warm absorbers, amounts of the disk reflection continuum and apparently broad iron emission line flux are not as large as previously thought without warm absorbers.
Ebisawa Ken
Inoue Hajime
Miyakawa Takahiko
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