Z=0.975时星系团XMMU J1230 .3+1339的全色图像--观测一个大质量系统的集合
A pan-chromatic view of the galaxy cluster XMMU J1230.3+1339 at z=0.975 - Observing the assembly of a massive system
摘要：
我们提出了一个全面的星系团研究XMMU J1230.3+1339的基础上，联合分析的X射线数据，光学成像和光谱观测，弱透镜的结果，并实现一个详细的多组件视图，这个新发现的系统在z=0.975的无线电特性。我们发现了一个光学性质非常丰富的大质量系统，其M200 $\simeq$（4.2 $\pm$ 0.8）$\times$ 10^14 M $\sun$，Tx $\simeq$ 5.3（+0.7--0.6）keV，Lx $\simeq$（6.5 $\pm$ 0.7）$\times$ 10^44 erg/s，测量并比较了各种广泛使用的质量代理。我们已经确定了多个集群相关的组件，包括一个中央飞越组靠近核心通道与相关的边缘扩展1.4GHz的无线电发射可能源自湍流尾流区的合并事件。在星系团的外围，我们看到了一个轴上坠落的星系团和第二个布里渊星系团星系（BCG）的证据，以及一个额外的离轴星系团吸积事件的迹象。我们跟踪两个星系细丝超出标称集群半径，并提供了一个尝试性的重建系统的三维吸积几何。根据总质量、ICM结构、光学丰度以及两个主要的BCG型星系的存在，新确认的星系团XMMU J1230.3+1339可能是一个与后发座星系团非常相似的系统的前身，但结构演化相差7.6 Gyr。
英文摘要：
We present a comprehensive galaxy cluster study of XMMU J1230.3+1339 based on a joint analysis of X-ray data, optical imaging and spectroscopy observations, weak lensing results, and radio properties for achieving a detailed multi-component view of this newly discovered system at z=0.975. We find an optically very rich and massive system with M200$\simeq$(4.2$\pm$0.8)$\times$10^14 M$\sun$, Tx$\simeq$5.3(+0.7--0.6)keV, and Lx$\simeq$(6.5$\pm$0.7)$\times$10^44 erg/s, for which various widely used mass proxies are measured and compared. We have identified multiple cluster-related components including a central fly-through group close to core passage with associated marginally extended 1.4GHz radio emission possibly originating from the turbulent wake region of the merging event. On the cluster outskirts we see evidence for an on-axis infalling group with a second Brightest Cluster Galaxy (BCG) and indications for an additional off-axis group accretion event. We trace two galaxy filaments beyond the nominal cluster radius and provide a tentative reconstruction of the 3D-accretion geometry of the system. In terms of total mass, ICM structure, optical richness, and the presence of two dominant BCG-type galaxies, the newly confirmed cluster XMMU J1230.3+1339 is likely the progenitor of a system very similar to the local Coma cluster, differing by 7.6 Gyr of structure evolution.
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