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具有高熵和低熵子团核的双峰普朗克SZ探测星系团PLCKG345 .40-39.34(A3716)的Chandra和XMM-Newton观测

Chandra and XMM-Newton Observations of the Bimodal Planck SZ-detected Cluster PLCKG345.40-39.34 (A3716) with High and Low Entropy Subcluster Cores

Felipe Andrade-Santos, Christine Jones, William R. Forman, Stephen S. Murray, Ralph P. Kraft, Alexey Vikhlinin, Reinout J. van Weeren, Paul E. J. Nulsen, Lauren… 展开作者

Felipe Andrade-Santos, Christine Jones, William R. Forman, Stephen S. Murray, Ralph P. Kraft, Alexey Vikhlinin, Reinout J. van Weeren, Paul E. J. Nulsen, Laurence P. David, William A. Dawson, Monique Arnaud, Etienne Pointecouteau, Gabriel W. Pratt, Jean-Baptiste Melin

摘要:

我们目前的结果,钱德拉,XMM牛顿,和ROSAT观测的普朗克SZ检测集群A3716(PLCKG345.40-39.34 - G345)。我们发现,G345实际上是两个在天空中相隔400 kpc的子星系团。我们测量了子星系团的气体温度(~ 2-3 keV)、总质量(~ 1-2 x 10^14太阳质量)和气体质量(~ 1-2 x 10^13太阳质量)、r500以内的气体质量分数、熵分布和X射线光度(~ 10^43 erg/s)。使用两个子集群的气体密度和温度分布,我们表明,有良好的(0.8西格玛)之间的预期Sunyaev Zel 'dovich信号预测的X射线数据和普朗克任务测量的协议,更好的协议在0.6西格玛内,当我们重新计算普朗克值假设一个两个组件集群模型,与固定的X射线数据的基础上的相对振幅。动力学分析显示,这两个星系子团很可能(> 97%的概率)受到引力束缚,在最有可能的情况下,子团将在5亿+-2亿年内经历核心通过。北部的子星系团是中央峰值,有一个低熵的核心,而南部的子星系团有一个高熵的中心。南子星系团中心的高熵可以解释为几个星系团的合并,如五个巨大的椭圆星系的存在,或AGN能量注入,如其中一个大质量椭圆星系中存在强大的射电源,或两种过程的组合。

英文摘要:

We present results from Chandra, XMM-Newton, and ROSAT observations of the Planck SZ-detected cluster A3716 (PLCKG345.40-39.34 - G345). We show that G345 is, in fact, two subclusters separated on the sky by 400 kpc. We measure the subclusters' gas temperatures (~ 2-3 keV), total (~ 1-2 x 10^14 solar masses) and gas (~ 1-2 x 10^13 solar masses) masses, gas mass fraction within r500, entropy profiles, and X-ray luminosities (~ 10^43 erg/s). Using the gas density and temperature profiles for both subclusters, we show that there is good (0.8 sigma) agreement between the expected Sunyaev-Zel'dovich signal predicted from the X-ray data and that measured from the Planck mission, and better agreement within 0.6 sigma when we re-computed the Planck value assuming a two component cluster model, with relative amplitudes fixed based on the X-ray data. Dynamical analysis shows that the two galaxy subclusters are very likely (> 97% probability) gravitationally bound, and in the most likely scenario, the subclusters will undergo core passage in 500 +- 200 Myr. The northern subcluster is centrally peaked and has a low entropy core, while the southern subcluster has a high central entropy. The high central entropy in the southern subcluster can be explained either by the mergers of several groups, as suggested by the presence of five giant ellipticals or by AGN energy injection, as suggested by the presence of a strong radio source in one of its massive elliptical galaxies, or by a combination of both processes.

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