A ROSAT PSPC observation of Abell 478: the distribution of X-ray absorbing matter in a massive cooling flow
A ROSAT PSPC observation of Abell 478: the distribution of X-ray absorbing matter in a massive cooling flow
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ROSAT PSPC 对 Abell 478 的观测：大量冷却流中 X 射线吸收物质的分布
DOI：
10.1093/mnras/262.4.901
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发表时间：
1993
影响因子：
4.8
通讯作者：
G. Stewart
中科院分区：
文献类型：
--
作者：
S. Allen;A. Fabian;R. Johnstone;D. White;S. Daines;A. Edge;G. Stewart
本文分析了用位置灵敏正比计数器(PSPC)在ROSAT上观测到的阿贝尔478星系团的X射线发光。星系团中心区域的X射线辐射被超过21厘米HI观测得到的银河系数值的柱密度所吸收，这证实了之前用爱因斯坦天文台的固态光谱仪进行的观测结果。在与X射线发射峰值同心的环形空间内，我们测量了星系团内柱子密度和温度的径向变化。光电子能谱表明，超额吸收集中在∼300kpc的内部，因此一定是团簇的本征吸收
We present the analysis of an observation of the X-ray luminous cluster of galaxies Abell 478 made with the Position Sensitive Proportional Counter (PSPC) on ROSAT. The X-ray emission from the central regions of the cluster is shown to be absorbed by a column density in excess of the Galactic value obtained from 21-cm H I observations, confirming the results of previous observations with the Solid State Spectrometer on the Einstein Observatory. We have measured the radial variation of column density and temperature within the cluster, in annuli concentric with the peak of the X-ray emission. The PSPC spectra show that the excess absorption is concentrated within the inner ∼300 kpc, and so must be intrinsic to the cluster