ariability of the X-ray Broad Iron Spectral Features in Active Galactic Nuclei and Black-hole Binaries
ariability of the X-ray Broad Iron Spectral Features in Active Galactic Nuclei and Black-hole Binaries
复制标题
活动星系核和黑洞双星中 X 射线宽铁谱特征的可靠性
DOI：
10.1002/asna.201612338
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发表时间：
2016
影响因子：
0.9
通讯作者：
and Hajime Inoue
中科院分区：
文献类型：
--
作者：
Misaki Mizumoto;Ken Ebisawa;Masahiro Tsujimoto;and Hajime Inoue
在活动星系核(AGN)和黑洞双星(BHB)的X射线光谱中，经常可以看到“宽广的铁谱特征”。这些特征可以用“相对论圆盘反射”情形或“部分覆盖”情形来解释：从时间平均光谱分析中很难确定哪种模型是有效的。因此，为了约束光谱模型，研究了X射线光谱的可变性。为此，至关重要的是在短时间尺度上详细研究BHB的铁结构，这是第一次通过铃鹿号上XIS探测器的并行和计时(P-SUM)模式实现的。该观测模式的时间分辨率为7.8ms，能量分辨率为ccd。我们对P-和模式进行了系统的定标，并研究了BHB GRS 1915+105的光谱变率。因此，我们发现GRS 1915+105的光谱变率在亚秒级没有表现出铁的特征。这与活动星系核1H0707-495等活动星系核的变化完全不同，后者的变化幅度在铁K能带显著下降。这种差异可以在“部分覆盖”场景的框架下自然地得到解释。(2016Wiley-VCH Verlag GmbH&Co.KGaA，Weinheim)
The “broad iron spectral features” are often seen in X‐ray spectra of active galactic nuclei (AGN) and black‐hole binaries (BHB). These features may be explained either by the “relativistic disc reflection” scenario or the “partial covering” scenario: It is hardly possible to determine which model is valid from time‐averaged spectral analysis. Thus, X‐ray spectral variability has been investigated to constrain spectral models. To that end, it is crucial to study iron structure of BHBs in detail at short time‐scales, which is, for the first time, made possible with the Parallel‐sum clocking (P‐sum) mode of XIS detectors on board of Suzaku. This observational mode has a time‐resolution of 7.8 ms as well as a CCD energyresolution. We have carried out systematic calibration of the P‐sum mode, and investigated spectral variability of the BHB GRS 1915+105. Consequently, we found that the spectral variability of GRS 1915+105 doesnotshow iron features at sub‐seconds. This is totally different from variability of AGN such as 1H0707–495, where the variation amplitude significantly drops at the iron K‐energy band. This difference can be naturally explained in the framework of the “partial covering” scenario. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)