Detailed Spectral Analysis of the 260 ks XMM-Newton Data of 1E 1207.4–5209 and Significance of a 2.1 keV Absorption Feature
Detailed Spectral Analysis of the 260 ks XMM-Newton Data of 1E 1207.4–5209 and Significance of a 2.1 keV Absorption Feature
复制标题
1E 1207.4–5209 260 ks XMM-Newton 数据的详细光谱分析以及 2.1 keV 吸收特征的意义
DOI：
10.1086/432632
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
C. Hailey
中科院分区：
文献类型：
--
作者：
K. Mori;James C. Chonko;C. Hailey
对1e1207.4 -5209的260 ks XMM-Newton观测数据进行了重新分析。与以前的工作相比，有几项重大改进。首先，使用了更广泛的物理上合理的光谱模型。其次，我们使用了更严格的统计分析。不采用标准的f分布，而是通过蒙特卡罗模拟确定了精确的有限统计量f分布。这种方法是由Protassov和他的同事以及Freeman和他的同事最近的工作所激发的。他们证明，当用于评估光谱中附加吸收特征的重要性时，标准f分布甚至不是渐近正确的。通过改进后的分析，我们没有发现1e1207.4 -5209的第三和第四个光谱特征，而只有先前报道的两个宽吸收特征。另外两个统计检验，一个依赖于线模型，另一个独立于线模型，证实了我们修改的f检验分析。对于所有物理上合理的连续体模型，其中弱残差强到足以拟合，残差出现在仪器Au M边缘。作为完整性检查，我们确认残差在强度和位置上与3C 273中观察到的仪器Au M残差一致。
We have reanalyzed the 260 ks XMM-Newton observation of 1E 1207.4-5209. There are several significant improvements over previous work. First, a much broader range of physically plausible spectral models was used. Second, we have used a more rigorous statistical analysis. The standard F-distribution was not employed, but rather the exact finite statistics F-distribution was determined by Monte Carlo simulations. This approach was motivated by the recent work of Protassov and coworkers and Freeman and coworkers. They demonstrated that the standard F-distribution is not even asymptotically correct when applied to assess the significance of additional absorption features in a spectrum. With our improved analysis we do not find a third and fourth spectral feature in 1E 1207.4-5209 but only the two broad absorption features previously reported. Two additional statistical tests, one line model dependent and the other line model independent, confirmed our modified F-test analysis. For all physically plausible continuum models in which the weak residuals are strong enough to fit, the residuals occur at the instrument Au M edge. As a sanity check we confirmed that the residuals are consistent in strength and position with the instrument Au M residuals observed in 3C 273.