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arXiv 1503.07694astro-ph.COastro-ph.HE
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Chandra和XMM-Newton对合并星系团PLCK G036 .7+14.9的观测

Chandra and XMM-Newton observations of the merging cluster of galaxies PLCK G036.7+14.9

B. Zhang, L. P. David, C. Jones, F. Andrade-Santos, E. O'Sullivan, H. Dahle, P. E. J. Nulsen, T. E. Clarke, E. Pointecouteau, G. W. Pratt, M. Arnaud, J. M. Vrti… 展开作者

B. Zhang, L. P. David, C. Jones, F. Andrade-Santos, E. O'Sullivan, H. Dahle, P. E. J. Nulsen, T. E. Clarke, E. Pointecouteau, G. W. Pratt, M. Arnaud, J. M. Vrtilek, L. Ji, R. J. van Weeren, R. P. Kraft, X. Kong

摘要:

我们介绍了钱德拉-普朗克遗产计划的PLCK G036.7+14.9的钱德拉和XMM-牛顿观测。高分辨率X射线观测揭示了两个紧密的子星系团G 036 N和G 036 S,这是以前的ROSAT,光学或最近的普朗克观测所无法分辨的。我们进行详细的成像和光谱分析,并使用一个简化的模型来研究这个系统的运动学。基本情况是PLCK G036.7+14.9正在经历两个大质量子星系团之间的主要合并(质量比接近1),合并主要沿着视线进行,可能处于早期阶段。G 036 N拥有一个小的中等冷核,而G 036 S在中心40 kpc区域最多只有一个非常弱的冷核。堆芯冷却时间的差异不太可能是由于正在进行的合并破坏了G 036 S中预先存在的冷却堆芯。G 036 N还在中心拥有一个未解决的射电源,如果射电源延伸,可能会加热气体。普朗克导出的质量高于X射线测量的任一子星系团的质量,但低于整个星系团的X射线测量质量,这是因为普朗克没有将PLCK G036.7+14.9分解为子星系团,而是将其解释为单个星系团。这种质量差异可能会导致显着的偏差,质量函数,如果这种以前未解决的系统是常见的普朗克集群样本。高分辨率的X射线观测是必要的,以确定这样的系统的分数,并纠正这种偏差的目的,精确的宇宙学研究。

英文摘要:

We present Chandra and XMM-Newton observations of PLCK G036.7+14.9 from the Chandra-Planck Legacy Program. The high resolution X-ray observations reveal two close subclusters, G036N and G036S, which were not resolved by previous ROSAT, optical, or recent Planck observations. We perform detailed imaging and spectral analyses and use a simplified model to study the kinematics of this system. The basic picture is that PLCK G036.7+14.9 is undergoing a major merger (mass ratio close to unity) between the two massive subclusters, with the merger largely along the line-of-sight and probably at an early stage. G036N hosts a small, moderate cool-core, while G036S has at most a very weak cool-core in the central 40 kpc region. The difference in core cooling times is unlikely to be caused by the ongoing merger disrupting a pre-existing cool-core in G036S. G036N also hosts an unresolved radio source in the center, which may be heating the gas if the radio source is extended. The Planck derived mass is higher than the X-ray measured mass of either subcluster, but is lower than the X-ray measured mass of the whole cluster, due to the fact that Planck does not resolve PLCK G036.7+14.9 into subclusters and interprets it as a single cluster. This mass discrepancy could induce significant bias to the mass function if such previously unresolved systems are common in the Planck cluster sample. High resolution X-ray observations are necessary to identify the fraction of such systems and correct such a bias for the purpose of precision cosmological studies.

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