A re-analysis of the iron line in the XMM–Newton data from the low/hard state in GX339−4
A re-analysis of the iron line in the XMM–Newton data from the low/hard state in GX339−4
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DOI：
10.1111/j.1365-2966.2010.17092.x
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发表时间：
2009-11
影响因子：
4.8
通讯作者：
C. Done;M. D. Trigo
中科院分区：
文献类型：
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作者：
C. Done;M. D. Trigo
在来自黑洞联星GX 339 -4的低/硬状态的XMM-Newton MOS数据中检测到一条极其宽的铁线，这是唯一一条与对该状态的极其成功的截盘解释明确冲突的证据。然而，它也与低/硬态的所有其他替代几何形状的观测数据的某些方面相冲突，包括喷流模型，使其非常难以理解。我们重新分析了这些数据，并表明它们受到堆积的强烈影响，即使有广泛的质心去除，因为源比推荐的最大计数率亮约200倍。相反，我们提取的同时PN时序模式的数据，不应该受到堆积。这些显示出比MOS数据中的线明显更窄的线。因此，这些数据很容易与截短的圆盘相一致，并且确实有力地支持了这种解释。
The detection of an extremely broad iron line in XMM-Newton MOS data from the low/hard state of the black hole binary GX339-4 is the only piece of evidence which unambiguously conflicts with the otherwise extremely successful truncated disc interpretation of this state. However, it also conflicts with some aspect of observational data for all other alternative geometries of the low/hard state, including jet models, making it very difficult to understand. We re-analyse these data and show that they are strongly affected by pile-up even with extensive centroid removal as the source is ~200 times brighter than the recommended maximum count rate. Instead, we extract the simultaneous PN timing-mode data which should not be affected by pile-up. These show a line which is significantly narrower than in the MOS data. Thus these data are easily consistent with a truncated disc, and indeed, strongly support such an interpretation.