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arXiv 1107.5945astro-ph.COastro-ph.HE
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通过Sunyaev-Zel'dovich效应发现星团内射电发射与高压区之间的对应关系

Discovery of the correspondence between intra-cluster radio emission and a high pressure region detected through the Sunyaev-Zel'dovich effect

C. Ferrari, H. T. Intema, E. Orrù, F. Govoni, M. Murgia, B. Mason, H. Bourdin, K. M. Asad, P. Mazzotta, M. W. Wise, T. Mroczkowski, J. H. Croston

摘要:

我们分析了X射线最明亮的星系团RX J1347-1145的新的237 MHz和614 MHz GMRT数据。我们的无线电结果与MUSTANG 90 GHz Sunyaev Zel 'dovich效应图和重新处理的钱德拉和XMM-牛顿档案数据的这个集群进行了比较。我们第一次明确地指出,通过Sunyaev-Zel'dovich效应和X射线观测,在一个弥漫的星系团内射电源和一个热区域检测到的无线电过剩之间的对应关系。我们的研究结果表明,电子再加速的无线电小晕在RX J1347-1145中心的过量发射是最有可能与冲击波阵面传播到集群内的介质。

英文摘要:

We analyzed new 237 MHz and 614 MHz GMRT data of the most X-ray luminous galaxy cluster, RX J1347-1145. Our radio results are compared with the MUSTANG 90 GHz Sunyaev-Zel'dovich effect map and with re-processed Chandra and XMM-Newton archival data of this cluster. We point out for the first time in an unambiguous way the correspondence between a radio excess in a diffuse intra-cluster radio source and a hot region detected through both Sunyaev-Zel'dovich effect and X-ray observations. Our result indicates that electron re-acceleration in the excess emission of the radio mini-halo at the center of RX J1347-1145 is most likely related to a shock front propagating into the intra-cluster medium.

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