Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2012-02-13
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
Submitted to Publications of the Astronomical Society of Japan
Scientific paper
We propose a new spectral model for the Seyfert 1 Galaxy MCG-6-30-15 that can describe most of the 1 - 40 keV spectral variation effectively by a single parameter. Our spectral model includes three continuum components; (1) a direct power-law component, (2) a heavily absorbed power-law component by thick photoionized material, and (3) a cold disk reflection component far from the black hole with moderate solid-angle including a narrow fluorescent iron line. The ionized iron K-edge of the heavily absorbed power-law component can explain most of the seemingly broad "disk line" spectral feature, so that our model does not require an additional broad iron emission line. In the course of spectral variations, the "total normalization", which is sum of the normalizations of the direct power-law component and the absorbed component, is not significantly variable, while the "covering fraction", which is defined as ratio of the normalization of the absorbed component to the total normalization, is much more significantly variable. We propose that MCG-6-30-15 has a moderately extended, not significantly variable central X-ray source, partially covered by intervening optically thick clouds having internal ionization structure, so that observed flux and spectral variations are primarily caused by variation of the partial covering fraction. These absorbing clouds probably correspond to the fast-moving broad line region (BLR) clouds.
Ebisawa Ken
Inoue Hajime
Miyakawa Takehiro
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