Discovery of large-scale diffuse radio emission and of a new galaxy cluster in the surroundings of MACS J0520.7-1328
Discovery of large-scale diffuse radio emission and of a new galaxy cluster in the surroundings of MACS J0520.7-1328
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DOI：
10.1051/0004-6361/201323275
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发表时间：
2014-02
影响因子：
6.5
通讯作者：
G. Macario;H. Intema;C. Ferrari;H. Bourdin;S. Giacintucci;T. Venturi;P. Mazzotta;I. Bartalucci;M. Johnston-Hollitt;R. Cassano;D. Dallacasa;G. Pratt;R. Kale;Shea Brown
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文献类型：
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作者：
G. Macario;H. Intema;C. Ferrari;H. Bourdin;S. Giacintucci;T. Venturi;P. Mazzotta;I. Bartalucci;M. Johnston-Hollitt;R. Cassano;D. Dallacasa;G. Pratt;R. Kale;Shea Brown
我们报告的大规模弥漫性射电辐射的星系团MACS J0520.7-1328东南的发现，通过高灵敏度的巨型米波射电望远镜323 MHz的观测检测。这种辐射主要是由一个细长的漫射射电源和周围的其他功能较低的表面亮度。补丁这些微弱的源边缘检测到在1.4 GHz的图像通过重新分析档案NVSS数据。有趣的是，拉长的射电源与以前未分类的扩展X射线源相吻合。我们进行多波长分析的基础上档案红外，光学和X射线钱德拉数据。我们发现这个源是一个低温（~3.6 keV）星系团，有迹象表明动力学状态受到干扰，其红移与主要星系团MACS J0520.7-132（z = 0.336）之一一致。我们认为漫射射电发射与新检测到的星系团及其周围的星系团内和星系际介质中的非热成分有关。我们正在计划进行更深入的多波长和多频率无线电观测，以准确地研究这两个星团的动力学情况，并更精确地解决复杂无线电发射的性质。
We report the discovery of large-scale diffuse radio emission south-east of the galaxy cluster MACS J0520.7-1328, detected through high-sensitivity Giant Metrewave Radio Telescope 323 MHz observations. This emission is dominated by an elongated diffuse radio source and surrounded by other features of lower surface brightness. Patches of these faint sources are marginally detected in a 1.4 GHz image obtained through a re-analysis of archival NVSS data. Interestingly, the elongated radio source coincides with a previously unclassified extended X-ray source. We perform a multi-wavelength analysis based on archival infrared, optical, and X-ray Chandra data. We find that this source is a low-temperature (~3.6 keV) cluster of galaxies, with indications of a disturbed dynamical state, located at a redshift that is consistent with the one of the main galaxy cluster MACS J0520.7-132 (z = 0.336). We suggest that the diffuse radio emission is associated to non-thermal components in the intracluster and intergalactic medium in and around the newly detected cluster. We are planning deeper multi-wavelength and multi-frequency radio observations to accurately investigate the dynamical scenario of the two clusters and to address the nature of the complex radio emission more precisely.