Characterization of diffuse X-ray emission from IGR?J17448$-$3232: an implication of a line-of-sight merging activity
Characterization of diffuse X-ray emission from IGR?J17448$-$3232: an implication of a line-of-sight merging activity
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IGR 漫射 X 射线发射的表征？J17448$-$3232：视线合并活动的含义
DOI：
10.1093/pasj/psz098
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发表时间：
2019
影响因子：
2.3
通讯作者：
Akamatsu Hiroki
中科院分区：
文献类型：
--
作者：
Watanabe Shoko;Yamauchi Shigeo;Nobukawa Kumiko K;Akamatsu Hiroki
本文给出了星系团IGR J174483232的光谱分析结果。中心区域（kpc）的簇内介质（ICM）具有较高的电子温度等离子体of - kev，并且由FexxviLyFexxvHelines的强度比估算出的电离温度低于电子温度，表明ICM处于非电离平衡（NEI）状态。中心区域的光谱也可以用双组分模型拟合：温度为kev和kev的碰撞电离平衡（CIE）中的双温度等离子体模型，或温度为kev和光子指数为1.1的ciepower定律模型。双分量模型可以表示FexxviLyFexxvHelines的强度比。另一方面，外区（）的光谱可以用一个温度为5 kev的单一CIE等离子体模型来解释。根据其光谱特征和圆形结构，我们提出NEI等离子体是沿视距方向合并产生的。
The results of spectral analysis for the galaxy cluster IGR J174483232 are presented. The intracluster medium (ICM) in the central region (,kpc) has a high electron temperature plasma of–keV, and an ionization temperature estimated from an intensity ratio of FexxviLyFexxvHelines is lower than the electron temperature, which suggests that the ICM is in the non-ionization equilibrium (NEI) state. The spectrum in the central region can be also fitted with a two-component model: a two-temperature plasma model in a collisional ionization equilibrium (CIE) with temperatures ofkeV andkeV, or a CIEpower-law model with a temperature ofkeV and a photon index of 1.1. The two-component models can represent the intensity ratio of FexxviLyFexxvHelines. On the other hand, the spectrum in the outer region () can be explained by a single CIE plasma model with a temperature of 5–keV. Based on the spectral feature and its circular structure, we propose that the NEI plasma was produced by merging along the line-of-sight direction.