Chandra and XMM–Newton observations of A2256: cold fronts, merger shocks, and constraint on the IC emission

Chandra and XMM–Newton observations of A2256: cold fronts, merger shocks, and constraint on the IC emission
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Chandra 和 XMM-Newton 对 A2256 的观测:冷锋、合并冲击以及对 IC 排放的限制

DOI:
10.1093/mnras/staa2320
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发表时间:
2020
影响因子:
4.8
通讯作者:
Markevitch, Maxim
Markevitch, Maxim
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Ge, Chong;Liu, Ruo-Yu;Sun, Ming;Yu, Heng;Rudnick, Lawrence;Eilek, Jean;Owen, Frazer;Dasadia, Sarthak;Rossetti, Mariachiara;Markevitch, Maxim

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我们展示了chandraandxmm - newton对一个复杂合并星系团Abell 2256 (A2256)的深度观测结果,该星系团拥有一个壮观的无线电遗迹(RR)。温度图和金属丰度图显示了西部亚星团(SC)和主星团(PC)合并的明显证据。我们检测到五个x射线表面亮度边缘。其中靠近星团中心的三个是冷锋(CFs): CF1与下沉的SC有关;CF2位于PC的东面;CF3位于PC核心的西面。星团外围的另外两个边缘是激波锋(SFs): NW RR附近的SF1的马赫数分别来源于温度和密度的跳跃,ofMT= 1.62±0.12,ρ= 1.23±0.06;SF2在SE中mt = 1.54±0.05,ρ= 1.16±0.13。在RR区域,没有证据表明x射线和射电子结构之间存在相关性,由此我们估计了逆康普顿发射的上限,并因此设定了单幂律电子能谱b >.0 μG的磁场下限(距离PC中心约450 kpc),对于破幂律电子能谱b > 0.4 μG。我们提出了一个包括PC、SC和group的合并方案。我们的合并方案考虑了x射线边缘、漫射无线电特征、星系运动学以及投影效应。
We present the results of deepChandraandXMM–Newtonobservations of a complex merging galaxy cluster Abell 2256 (A2256) that hosts a spectacular radio relic (RR). The temperature and metallicity maps show clear evidence of a merger between the western subcluster (SC) and the primary cluster (PC). We detect five X-ray surface brightness edges. Three of them near the cluster centre are cold fronts (CFs): CF1 is associated with the infalling SC; CF2 is located in the east of the PC; and CF3 is located to the west of the PC core. The other two edges at cluster outskirts are shock fronts (SFs): SF1 near the RR in the NW has Mach numbers derived from the temperature and the density jumps, respectively, ofMT= 1.62 ± 0.12 andMρ= 1.23 ± 0.06; SF2 in the SE hasMT= 1.54 ± 0.05 andMρ= 1.16 ± 0.13. In the region of the RR, there is no evidence for the correlation between X-ray and radio substructures, from which we estimate an upper limit for the inverse-Compton emission, and therefore set a lower limit on the magnetic field (∼ 450 kpc from PC centre) ofB> 1.0 μG for a single power-law electron spectrum orB> 0.4 μG for a broken power-law electron spectrum. We propose a merger scenario including a PC, an SC, and a group. Our merger scenario accounts for the X-ray edges, diffuse radio features, and galaxy kinematics, as well as projection effects.
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