Detection of a Double Relic in the Torpedo Cluster: SPT-CL J0245-5302
Detection of a Double Relic in the Torpedo Cluster: SPT-CL J0245-5302
复制标题
检测到鱼雷星团中的双重遗迹：SPT-CL J0245-5302
DOI：
10.1093/mnras/sty1467
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发表时间：
2018-03
影响因子：
4.8
通讯作者：
Li W. T.
中科院分区：
文献类型：
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作者：
Zheng Q.;Johnston-Hollitt M.;Duchesne S. W.;Li W. T.
鱼雷星系团SPT-CL J 0245 -5302（S 0295）是一个巨大的合并星系团，红移z = 0.300，与子弹星系团1 E 0657-55.8（z = 0.296）有着惊人的相似的形态，钱德拉X射线观测显示该星系团内部介质中有一个经典的弓形激波。我们目前澳大利亚望远镜紧凑阵列数据集中在2.1 GHz和默奇森宽场阵列数据在72 MHz和231 MHz之间的频率，我们用来研究集群的属性。我们在星团中发现了一些离散和弥散的射电源，包括在星团外围发现了两个以前未知的射电遗迹。在70 MHz和3.1 GHz之间的漫发射的平均光谱指数为$\alpha=-1.63_{-0.10}^{+0.10}$，并且计算出星团西部激波的无线电导出马赫数为M = 2.04。因此，鱼雷星团是一个中等红移的双遗迹系统。
The Torpedo cluster, SPT-CL J0245-5302 (S0295) is a massive, merging cluster at a redshift of z = 0.300, which exhibits a strikingly similar morphology to the Bullet cluster 1E 0657-55.8 (z = 0.296), including a classic bow shock in the cluster's intra-cluster medium revealed by Chandra X-ray observations. We present Australia Telescope Compact Array data centred at 2.1 GHz and Murchison Widefield Array data at frequencies between 72 MHz and 231 MHz which we use to study the properties of the cluster. We characterise a number of discrete and diffuse radio sources in the cluster, including the detection of two previously unknown radio relics on the cluster periphery. The average spectral index of the diffuse emission between 70 MHz and 3.1 GHz is $\alpha=-1.63_{-0.10}^{+0.10}$ and a radio-derived Mach number for the shock in the west of the cluster is calculated as M = 2.04. The Torpedo cluster is thus as a double relic system at moderate redshift.
DOI：
--
发表时间：
2017-07
期刊：
arXiv: Cosmology and Nongalactic Astrophysics
影响因子：
--
作者：
S. Duchesne;M. Johnston-Hollitt;A. Offringa;G. Pratt;Q. Zheng;S. D. V. U. O. Wellington;N. Zealand.;Peripety Scientific Ltd.;N. F. F. R. Astronomy-N.-F.-F.-R.-Astronomy-103039809;The Netherlands.;S. D. -. C. -. Irfu-S.-D.-.-C.-.-Irfu-2264875468;France
通讯作者：
S. Duchesne;M. Johnston-Hollitt;A. Offringa;G. Pratt;Q. Zheng;S. D. V. U. O. Wellington;N. Zealand.;Peripety Scientific Ltd.;N. F. F. R. Astronomy-N.-F.-F.-R.-Astronomy-103039809;The Netherlands.;S. D. -. C. -. Irfu-S.-D.-.-C.-.-Irfu-2264875468;France