Chandra observations of RX J1347.5−1145: the distribution of mass in the most X-ray-luminous galaxy cluster known
Chandra observations of RX J1347.5−1145: the distribution of mass in the most X-ray-luminous galaxy cluster known
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钱德拉对 RX J1347.5−1145 的观测：已知 X 射线最亮星系团中的质量分布
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
A. Fabian
中科院分区：
文献类型：
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作者：
S. Allen;R. Schmidt;A. Fabian
我们介绍了钱德拉对RX J1347.5−1145的观测，这是已知X射线最亮的星系团。我们报告发现了一个相对较热、明亮的X射线发射区域，位于主X射线峰东南约20弧秒的位置，该位置与小松等人最近报道的增强Sunyaev‐Zel'dovich效应区域一致。排除东南象限的数据，集群似乎相对宽松。X射线气体的温度从中心25 h −1 Kpc半径内的kT ~ 16 keV上升到0.1 ~ 0.5 h −1 Mpc之间的平均值~ 16 keV。在流体静力学平衡的假设下，星系团松弛区域的质量分布可以用Navarro，Frenk and白色模型参数化，尺度半径rs = 0.4 h −1 Mpc，浓度参数c = 6。最佳拟合的钱德拉质量模型与弱引力透镜研究的独立测量结果吻合良好。星团中心区域的强透镜数据也可以通过引入以第二亮星系为中心的额外质量团来解释。我们认为，这个星系很可能是最近合并的子星系团的主导星系。
We present Chandra observations of RX J1347.5−1145, the most X-ray-luminous cluster of galaxies known. We report the discovery of a region of relatively hot, bright X-ray emission, located approximately 20 arcsec to the south-east of the main X-ray peak at a position consistent with the region of enhanced Sunyaev‐Zel’dovich effect reported recently by Komatsu et al. We suggest that this region contains shocked gas resulting from a recent subcluster merger event. Excluding the data for the south-east quadrant, the cluster appears relatively relaxed. The X-ray gas temperature rises from kT ∼ 6 keV within the central 25 h −1 kpc radius to a mean value of ∼16 keV between 0.1 and 0.5 h −1 Mpc. The mass profile for the relaxed regions of the cluster, determined under the assumption of hydrostatic equilibrium, can be parametrized by a Navarro, Frenk and White model with a scale radius rs ∼ 0.4 h −1 Mpc and a concentration parameter c ∼ 6. The best-fitting Chandra mass model is in good agreement with independent measurements from weak gravitational lensing studies. Strong lensing data for the central regions of the cluster can also be explained by the introduction of an additional mass clump centred on the second brightest galaxy. We argue that this galaxy is likely to have been the dominant galaxy of the recently merged subcluster.