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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >ATCA 16 cm observation of CIZA J1358.9?4750: Implication of merger stage and constraint on non-thermal properties
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ATCA 16 cm observation of CIZA J1358.9?4750: Implication of merger stage and constraint on non-thermal properties

机译：ATZA 16 cm观察CIZA J1358.9？4750：合并阶段的影响和对非热性质的限制

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We report the Australia Telescope Compact Array 16?cm observation of CIZA J1358.9?4750. Recent X-ray studies imply that this galaxy cluster is composed of merging, binary clusters. Using the EW367 configuration, we found no significant diffuse radio emission in and around the cluster. An upper limit of the total radio power at 1.4?GHz is ～1.1?×?1022?W?Hz?1 in 30 square arcminutes, which is a typical size for radio relics. It is known that an empirical relation holds between the total radio power and X-ray luminosity of the host cluster. The upper limit is about one order of magnitude lower than the power expected from the relation. Very young (～70?Myr) shocks with low Mach numbers (～1.3), which are often seen at an early stage of merger simulations, are suggested by the previous X-ray observation. The shocks may generate cosmic-ray electrons with a steep energy spectrum, which is consistent with non-detection of bright (1023?W?Hz?1) relic in this 16?cm band observation. Based on the assumption of energy equipartition, the upper limit gives a magnetic field strength of below 0.68f(Dlos/1?Mpc)?1(γmin/200)?1?μG, where f is the cosmic-ray total energy density over the cosmic-ray electron energy density, Dlos is the depth of the shock wave along the sightline, and γmin is the lower cutoff Lorentz factor of the cosmic-ray electron energy spectrum.
机译：我们报告了CIZA J1358.9？4750的澳大利亚望远镜紧凑阵列16？cm观测结果。最近的X射线研究表明，这个星系团是由合并的二元团组成的。使用EW367配置，我们发现群集内和群集附近没有明显的漫射无线电发射。在1.4？GHz处，总无线电功率的上限为30平方弧分分钟内的〜1.1？×？1022？W？Hz？1，这是无线电文物的典型大小。众所周知，总无线电功率和主机簇的X射线发光度之间存在经验关系。上限比根据该关系预期的功率低大约一个数量级。以前的X射线观察表明，在合并模拟的早期阶段经常会看到马赫数低（〜1.3）的非常年轻的（〜70？Myr）电击。震动可能会产生具有陡峭能谱的宇宙射线电子，这与在此16？cm波段观测中未检测到明亮的（> 1023？W？Hz？1）遗迹相一致。根据能量均分的假设，上限给出的磁场强度低于0.68f（Dlos / 1？Mpc）？1（γmin/ 200）？1？μG，其中f是宇宙射线在整个过程中的总能量密度宇宙射线电子能量密度，Dlos是沿视线的冲击波深度，γmin是宇宙射线电子能量谱的下截止洛伦兹因子。

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