Suzaku Observations of the Hard X-ray Variability of MCG-6-30-15: the Effects of Strong Gravity Around a Kerr Black Hole
Suzaku Observations of the Hard X-ray Variability of MCG-6-30-15: the Effects of Strong Gravity Around a Kerr Black Hole
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DOI：
10.1093/pasj/59.sp1.s315
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发表时间：
2006-09
影响因子：
2.3
通讯作者：
G. Miniutti;A. Fabian;N. Anabuki;J. Crummy;Y. Fukazawa;L. Gallo;Y. Haba;K. Hayashida;S. Holt
中科院分区：
文献类型：
--
作者：
G. Miniutti;A. Fabian;N. Anabuki;J. Crummy;Y. Fukazawa;L. Gallo;Y. Haba;K. Hayashida;S. Holt
Suzaku首次实现了对Seyfert 1星系MCG-6-30-15的硬X射线可变性的测量。在14-45keV频段，强反射峰占主导地位的变率相对于几keV处的变化是熄灭的。这直接证明了整个反射光谱比幂定律连续谱的变化要小得多。宽带光谱可变性可以分解为两个分量--高度可变的幂定律和恒定反射--正如以前从2-10keV波段的其他观测推断的那样。强烈的反射和高的铁丰度形成了一条强大的宽铁线，这要求内盘半径约为2引力半径。我们的结果与光弯曲模型的预测是一致的，该模型调用了非常接近于快速旋转的黑洞的非常强的引力效应。
Suzaku has, for the first time, enabled the hard X-ray variability of the Seyfert 1 galaxy MCG-6-30-15 to be measured. The variability in the 14-45 keV band, which is dominated by a strong reflection hump, is quenched relative to that at a few keV. This directly demonstrates that the whole reflection spectrum is much less variable than the power-law continuum. The broadband spectral variability can be decomposed into two components - a highly variable power-law and constant reflection - as previously inferred from other observations in the 2-10 keV band. The strong reflection and high iron abundance give rise to a strong broad iron line, which requires the inner disc radius to be at about 2 gravitational radii. Our results are consistent with the predictions of the light bending model which invokes the very strong gravitational effects expected very close to a rapidly spinning black hole.