Chandra and XMM-Newton Observations of the Bimodal Planck SZ-detected Cluster PLCKG345.40-39.34 (A3716) with High and Low Entropy Subcluster Cores
Felipe Andrade-Santos, Christine Jones, William R. Forman, Stephen S. Murray, Ralph P. Kraft, Alexey Vikhlinin, Reinout J. van Weeren, Paul E. J. Nulsen, Lauren… 展开作者
Felipe Andrade-Santos, Christine Jones, William R. Forman, Stephen S. Murray, Ralph P. Kraft, Alexey Vikhlinin, Reinout J. van Weeren, Paul E. J. Nulsen, Laurence P. David, William A. Dawson, Monique Arnaud, Etienne Pointecouteau, Gabriel W. Pratt, Jean-Baptiste Melin
备注:
14 pages, 10 figures, 9 tables. Accepted for publication in ApJ
我们目前的结果,钱德拉,XMM牛顿,和ROSAT观测的普朗克SZ检测集群A3716(PLCKG345.40-39.34 - G345)。我们发现,G345实际上是两个在天空中相隔400 kpc的子星系团。我们测量了子星系团的气体温度(~ 2-3 keV)、总质量(~ 1-2 x 10^14太阳质量)和气体质量(~ 1-2 x 10^13太阳质量)、r500以内的气体质量分数、熵分布和X射线光度(~ 10^43 erg/s)。使用两个子集群的气体密度和温度分布,我们表明,有良好的(0.8西格玛)之间的预期Sunyaev Zel 'dovich信号预测的X射线数据和普朗克任务测量的协议,更好的协议在0.6西格玛内,当我们重新计算普朗克值假设一个两个组件集群模型,与固定的X射线数据的基础上的相对振幅。动力学分析显示,这两个星系子团很可能(> 97%的概率)受到引力束缚,在最有可能的情况下,子团将在5亿+-2亿年内经历核心通过。北部的子星系团是中央峰值,有一个低熵的核心,而南部的子星系团有一个高熵的中心。南子星系团中心的高熵可以解释为几个星系团的合并,如五个巨大的椭圆星系的存在,或AGN能量注入,如其中一个大质量椭圆星系中存在强大的射电源,或两种过程的组合。
英文摘要:
We present results from Chandra, XMM-Newton, and ROSAT observations of the Planck SZ-detected cluster A3716 (PLCKG345.40-39.34 - G345). We show that G345 is, in fact, two subclusters separated on the sky by 400 kpc. We measure the subclusters' gas temperatures (~ 2-3 keV), total (~ 1-2 x 10^14 solar masses) and gas (~ 1-2 x 10^13 solar masses) masses, gas mass fraction within r500, entropy profiles, and X-ray luminosities (~ 10^43 erg/s). Using the gas density and temperature profiles for both subclusters, we show that there is good (0.8 sigma) agreement between the expected Sunyaev-Zel'dovich signal predicted from the X-ray data and that measured from the Planck mission, and better agreement within 0.6 sigma when we re-computed the Planck value assuming a two component cluster model, with relative amplitudes fixed based on the X-ray data. Dynamical analysis shows that the two galaxy subclusters are very likely (> 97% probability) gravitationally bound, and in the most likely scenario, the subclusters will undergo core passage in 500 +- 200 Myr. The northern subcluster is centrally peaked and has a low entropy core, while the southern subcluster has a high central entropy. The high central entropy in the southern subcluster can be explained either by the mergers of several groups, as suggested by the presence of five giant ellipticals or by AGN energy injection, as suggested by the presence of a strong radio source in one of its massive elliptical galaxies, or by a combination of both processes.
The Merger Dynamics of the Galaxy Cluster Abell 1775: New Insights from Chandra and XMM-Newton for a Cluster Simultaneously Hosting a WAT and a NAT Radio Sources
X-Ray Analysis of an Off-Axis Merger Stage Binary Galaxy Cluster: PSZ2 G279.79+39.09
Istanbul University, Institute of Graduate Studies in Science, Programme of Astronomy and Space Sciences(伊斯坦布尔大学科学研究生研究院天文学与空间科学项目);George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University(乔治·P·和辛西娅·伍兹基础物理与天文学研究所,德克萨斯农工大学);Leiden Observatory(莱顿天文台);Istanbul University, Faculty of Science, Department of Astronomy and Space Sciences(伊斯坦布尔大学理学院天文学与空间科学系);INAF—IRA(意大利国家天体物理研究所-博洛尼亚天文台);Yildiz Technical University, Faculty of Arts and Science, Department of Physics(伊尔迪兹理工大学文理学院物理系);Center for Astrophysics |Harvard & Smithsonian(哈佛-史密森尼天体物理中心)
CFHT MegaCam Two Deep Fields Imaging Survey (2DFIS) II: Decoding the Lensing Profile of a "Rotating" Cluster with Deep CFHT Imaging
Shanghai Normal University(上海师范大学);Shanghai Astronomical Observatory, Chinese Academy of Sciences(中国科学院上海天文台);China Three Gorges University(三峡大学);Hefei Institute of Technology(合肥工业大学);University of Science and Technology of China(中国科学技术大学);Purple Mountain Observatory, Chinese Academy of Sciences(中国科学院紫金山天文台);Université Paris-Saclay(巴黎萨克雷大学);Université Paris Cité(巴黎西岱大学)
本研究通过深度 CFHT 成像分析 RXCJ0110.+=1358 星系团,揭示光学双峰性源于丝状体投影,解决光学与 X 射线观测间的矛盾。
CLASH-VLT: Dissecting the Frontier Fields Galaxy Cluster MACS J0416.1-2403 with $\sim800$ Spectra of Member Galaxies
本文报道前线场团簇MACS~J0416.1-2403(z=0.397)的VIMOS-VLT光谱。作为CLASH-VLT巡天的一部分,大型光谱活动提供了超过4000个可靠的红移,包括约800个星系团成员星系。在这个红移的星系团成员的前所未有的样本,使我们能够执行一个非常详细的动力学和结构分析的集群到~2.2 $r_{200}$(~ 4 Mpc)。我们对子结构的分析揭示了一个由主要大质量星系团组成的复杂系统($M_{200}$ ~0.9 $\times 10^{15} M_{\odot}$),具有两个主要特征:i)双峰速度分布,显示两个中心峰,间隔为$ΔV_{rf}$ ~1100 km s $^{-1}$,具有可比的星系内容和速度分散,ii)主要子结构沿NE-SW方向的投影伸长,在中心西南约600 kpc处有一个突出的亚丛,在中心和西南丛之间大约有一个孤立的BCG。我们还探测到一个低质量结构,位于星团中心z~0.390,~10' S,投影在~ 3 Mpc,相对视线速度为$ΔV_{rf}$ ~-1700 km s $^{-1}$。我们通过动力学分析得到的团簇质量分布明显偏离“通用”NFW,最适合软化等温球模型。从星系动力学测量的质量分布被发现是在相对较好的协议与那些从强和弱透镜,以及与从X射线,尽管明显的不放松的性质的集群。我们的研究结果揭示了这个大规模集群的整体复杂的动力学状态,并支持…