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Chandra X-Ray Observations of Galaxies in an Off-Center Region of the Coma Cluster

机译:昏迷星团偏心区域星系的Chandra X射线观察

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摘要

We have performed a pilot Chandra survey of an off-center region of the Coma Cluster to explore the X-ray properties and luminosity function of normal galaxies. We present results on 13 Chandra-detected galaxies with optical photometric matches, including four spectroscopically confirmed Coma-member galaxies. All seven spectroscopically confirmed giant Coma galaxies in this field have detections or limits consistent with low X-ray to optical flux ratios [(fX/fR) 10-3]. We do not have sufficient numbers of X-ray-detected galaxies to directly measure the galaxy X-ray luminosity function (XLF). However, since we have a well-measured optical LF, we take this low X-ray to optical flux ratio for the seven spectroscopically confirmed galaxies to translate the optical LF to an XLF. We find good agreement with Finoguenov et al. (2004), indicating that the X-ray emission per unit optical flux per galaxy is suppressed in clusters of galaxies, but we extend this work to a specific off-center environment in the Coma Cluster. Finally, we report the discovery of a region of diffuse X-ray flux that might correspond to a small group interacting with the Coma intracluster medium (ICM).
机译:我们已经对昏迷星团的偏心区域进行了Chandra试点调查,以探索正常星系的X射线特性和光度函数。我们提出了13个钱德拉检测到的与光学光度匹配的星系的结果,其中包括四个经光谱确认的彗星成员星系。在该领域中,所有七个经光谱确认的巨大彗星星系都具有与低X射线与光通量比一致的检测或限度[(fX / fR)<10-3]。我们没有足够数量的X射线检测到的星系来直接测量星系的X射线光度函数(XLF)。但是,由于我们有一个测量良好的光学LF,我们对七个经光谱确认的星系采用了低的X射线与光通量之比,以将光学LF转换为XLF。我们与Finoguenov等人达成了良好的协议。 (2004年),表明在星系团中每个星系的每单位光通量的X射线发射受到抑制,但是我们将此工作扩展到了昏迷星团中特定的偏心环境。最后,我们报告发现了可能与与昏迷集群内介质(ICM)相互作用的小组相对应的X射线通量扩散区域。

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