Abell 3627: A Nearby, X-Ray Bright, and Massive Galaxy Cluster
Abell 3627: A Nearby, X-Ray Bright, and Massive Galaxy Cluster
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Abell 3627：附近一个 X 射线明亮的巨大星系团
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
R. Kraan
中科院分区：
文献类型：
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作者：
H. Bohringer;D. Neumann;S. Schindler;R. Kraan
星团A3627最近被确认为是一个非常大质量的星团，在一次星系巡天中靠近银道面。我们正在报告ROSAT PSPC对该天体的观测，这证实了该星团确实非常巨大。从该星系团中检测到的X射线辐射半径几乎超过1度。X射线图像不是球对称的，显示正在进行的集群合并的迹象。由于强的星际吸收，光谱分析和气体温度的确定是困难的。这些数据与5至10 keV范围内的总体气体温度一致。在合并区域有温度变化的迹象。如果外推到维里半径3 h_{50}^{-1}$ Mpc，则基于X射线数据的质量估计值为0.4 - 2.2 cdot 10^{15}$ msu。在ROSAT的能量波段（0.1 - 2.4 keV），星系团的辐射产生了大约2 cdot 10^{-10}$ erg s$^{-1}$ cm$^{-2}$的通量，这使得A3627成为ROSAT全天巡天中最亮的第6个星系团。这个星团在早期的X射线巡天中被遗漏了，因为它与邻近的X射线明亮的银河X射线双星（1H 1556 -605）混淆了。大的X射线通量使A3627成为未来研究的重要目标。
The cluster A3627 was recently recognized to be a very massive, nearby cluster in a galaxy survey close to the galactic plane. We are reporting on ROSAT PSPC observations of this object which confirm that the cluster is indeed very massive. The X-ray emission detected from the cluster extends over almost 1 degree in radius. The X-ray image is not spherically symmetric and shows indications of an ongoing cluster merger. Due to the strong interstellar absorption the spectral analysis and the gas temperature determination are difficult. The data are consistent with an overall gas temperature in the range 5 to 10 keV. There are signs of temperature variations in the merger region. A mass estimate based on the X-ray data yields values of $0.4 - 2.2 cdot 10^{15}$ msu if extrapolated to the virial radius of $3 h_{50}^{-1}$ Mpc. In the ROSAT energy band (0.1 - 2.4 keV) the cluster emission yields a flux of about $2 cdot 10^{-10}$ erg s$^{-1}$ cm$^{-2}$ which makes A3627 the 6$^{th}$ brightest cluster in the ROSAT All Sky Survey. The cluster was missed in earlier X-ray surveys because it was confused with a neighbouring X-ray bright, galactic X-ray binary (1H1556-605). The large X-ray flux makes A3627 an important target for future studies.