A giant radio halo in the cool core cluster CL1821+643
A giant radio halo in the cool core cluster CL1821+643
复制标题
DOI：
10.1093/mnrasl/slu110
复制
发表时间：
2014-07
影响因子：
4.8
通讯作者：
A. Bonafede;H. Intema;M. Brüggen;H. Russell;G. Ogrean;K. Basu;M. Sommer;R. V. Weeren;R. Cassano;A. Fabian;H. Röttgering
中科院分区：
文献类型：
--
作者：
A. Bonafede;H. Intema;M. Brüggen;H. Russell;G. Ogrean;K. Basu;M. Sommer;R. V. Weeren;R. Cassano;A. Fabian;H. Röttgering
巨大的射电晕是在一些合并的星系团中发现的mpc大小的光源。同步加速器发射的电子被认为是由两个大质量星团合并引起的等离子体湍流（再）加速的。冷核星系团的核心温度较低，这可能表明最近没有发生大的合并。CL1821+643是目前已知最强的冷核星团之一。令人惊讶的是，我们发现了一个巨大的射电晕，其最大线性尺寸为1.1 Mpc。我们在提出的巨射电晕模型的框架内讨论了星系团的射电和x射线性质。如果合并引起了无线电发射，尽管存在冷核，我们认为它应该是离轴的，或者处于早期阶段，或者是较小的阶段。
Giant radio halos are Mpc-size sources found in some merging galaxy clusters. The synchrotron emitting electrons are thought to be (re)accelerated by plasma turbulence induced by the merging of two massive clusters. Cool core galaxy clusters have a low temperature core, likely an indication that a major merger has not recently occurred. CL1821+643 is one of the strongest cool core clusters known so far. Surprisingly, we detect a giant radio halo with a largest linear size of $\sim$ 1.1 Mpc. We discuss the radio and X-ray properties of the cluster in the framework of the proposed models for giant radio halos. If a merger is causing the radio emission, despite the presence of a cool-core, we suggest that it should be off-axis, or in an early phase, or a minor one.