A pan-chromatic view of the galaxy cluster XMMU J1230.3+1339 at z = 0.975 - Observing the assembly of a massive system

A pan-chromatic view of the galaxy cluster XMMU J1230.3+1339 at z = 0.975 - Observing the assembly of a massive system
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星系团 XMMU J1230 3 1339 在 z = 0 975 处的全色视图 - 观察大规模系统的组装

DOI:
10.1051/0004-6361/201015204
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发表时间:
2011
影响因子:
6.5
通讯作者:
Nastasi
Nastasi
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Fassbender;Böhringer;Santos;Šuhada;Kohnert;Lerchster;Rovilos;Pierini;Schwope;Mühlegger;Rosati;Quintana;Nastasi

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大质量星系团及其物质组分的形成和演化的观测为宇宙结构的形成、星系团内介质的热历史、星系演化、星系子成分的引力和流体动力相互作用物理提供了重要的制约因素。目的研究X射线选择星系团XMMU J1230.3+1339atz=0.975的全球多波长特性。我们测量和比较了各种广泛使用的质量指标,并确定了从核心区域到大型结构环境的多个星系团相关成分。方法我们基于X射线数据、光学成像和光谱观测、弱透镜结果和射电性质的联合分析,对星系团进行了全面的研究,以获得详细的多组分星系图。结果我们发现了一个光学上非常丰富的大质量系统,其M200≃=(4.2x±0.08)×1014M⊙,\Hbox{}=Kev,\Hbox{}X×1044erg/S-1。我们已经确定了靠近核心通道的一个中心穿越群,并发现了轻微扩展的1.4 GHz射电辐射,可能与合并事件的湍流尾迹区有关。在星系团的外围,我们看到了轴上坠落的星系群和第二亮的星系团(BCG)的证据,以及另一个离轴群吸积事件的迹象。我们追踪了标称星系团半径以外的两个星系丝,并初步重建了系统的3D吸积几何。结论从总质量、ICM结构、光学丰度和两个主要的卡介苗类型星系的存在来看,新确认的星系团XMMU J1230.3+1339很可能是一个与本地彗星团非常相似的系统的先驱,结构演化的差异为7.6Gyr。这个新系统是一个理想的天体物理模型实验室,用于深入研究重子在冷相和热相的聚集。
ContextObservations of the formation and evolution of massive galaxy clusters and their matter components provide crucial constraints on cosmic structure formation, the thermal history of the intracluster medium (ICM), galaxy evolution, transformation processes, and gravitational and hydrodynamic interaction physics of the subcomponents.AimsWe characterize the global multi-wavelength properties of the X-ray selected galaxy cluster XMMU J1230.3+1339 atz= 0.975, a new system discovered within the XMM-NewtonDistant Cluster Project (XDCP). We measure and compare various widely used mass proxies and identify multiple cluster-associated components from the inner core region out to the large-scale structure environment.MethodsWe present a comprehensive galaxy cluster study 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 on a system atz~ 1.ResultsWe find an optically very rich and massive system withM200≃ (4.2 ± 0.8)  ×  1014M⊙, \hbox{} keV, and \hbox{}  ×  1044erg s-1. We have identified a central fly-through group close to core passage and find marginally extended 1.4 GHz radio emission possibly associated with 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.ConclusionsIn 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. This new system is an ideally suited astrophysical model laboratory for in-depth follow-up studies on the aggregation of baryons in the cold and hot phases.
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