The X-ray luminous galaxy cluster XMMU J1007.4+1237 at z=1.56 - The dawn of starburst activity in cluster cores
The X-ray luminous galaxy cluster XMMU J1007.4+1237 at z=1.56 - The dawn of starburst activity in cluster cores
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DOI：
10.1051/0004-6361/201016169
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发表时间：
2011-01
影响因子：
6.5
通讯作者：
R. Fassbender;A. Nastasi;H. Bohringer;R. Suhada;Joana S. Santos;P. Rosati;D. Pierini;M. Muhlegger;H. Quintana;A. Schwope;G. Lamer;A. D. Hoon;J. Kohnert;G. Pratt;J. Mohr
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作者：
R. Fassbender;A. Nastasi;H. Bohringer;R. Suhada;Joana S. Santos;P. Rosati;D. Pierini;M. Muhlegger;H. Quintana;A. Schwope;G. Lamer;A. D. Hoon;J. Kohnert;G. Pratt;J. Mohr
上下文在z > 1.5的观测星系团研究探索了第一个大质量M > 10 14 M <$暗物质晕的形成，热ICM的早期热历史，以及淬灭早型星系的红色序列人口的出现。目标。我们提出了新发现的X射线发光星系团XMMUJ1007.4+1237在z = 1.555的第一个结果，由XMM-牛顿遥远星系团计划（XDCP）调查检测和确认。方法.我们选择该系统作为XMM-牛顿档案数据中偶然发现的弱扩展X射线源，并对其进行了双波段近红外成像和深层光谱学。结果我们可以确定XMMU J 1007.4+1237是一个光谱证实的大质量星系团，其X射线辐射光度为L bol X，500 <$（2.1 ± 0.4）x 1044 erg/s，是一个以X射线辐射为中心的红色星系群，是一个中心射电最亮的星系团星系。然而，我们第一次看到证据表明，星系人口的大质量末端和星系团红色序列尚未完全到位。特别是，我们发现正在进行的星暴活动的第三排名星系接近中心和另一个稍微暗淡的对象。结论.在9.4 Gyr的回顾时间，星团星系人口似乎陷入了一个重要的演化阶段，在核心区域完全恒星形成淬火和质量组装之前。X射线选择技术是识别和探测最遥远的星系团的有效手段，而无需事先假设它们的星系内容。
Context. Observational galaxy cluster studies at z > 1.5 probe the formation of the first massive M > 10 14 M ⊙ dark matter halos, the early thermal history of the hot ICM, and the emergence of the red-sequence population of quenched early-type galaxies. Aims. We present first results for the newly discovered X-ray luminous galaxy cluster XMMUJ1007.4+1237 at z = 1.555, detected and confirmed by the XMM-Newton Distant Cluster Project (XDCP) survey. Methods. We selected the system as a serendipitous weak extended X-ray source in XMM-Newton archival data and followed it up with two-band near-infrared imaging and deep optical spectroscopy. Results. We can establish XMMU J 1007.4+1237 as a spectroscopically confirmed, massive, bona fide galaxy cluster with a bolometric X-ray luminosity of L bol X,500 ≃ (2.1 ± 0.4) x 10 44 erg/s, a red galaxy population centered on the X-ray emission, and a central radio-loud brightest cluster galaxy. However, we see evidence for the first time that the massive end of the galaxy population and the cluster red-sequence are not yet fully in place. In particular, we find ongoing starburst activity for the third ranked galaxy close to the center and another slightly fainter object. Conclusions. At a lookback time of 9.4 Gyr, the cluster galaxy population appears to be caught in an important evolutionary phase, prior to full star-formation quenching and mass assembly in the core region. X-ray selection techniques are an efficient means of identifying and probing the most distant clusters without any prior assumptions about their galaxy content.