Discovery of the X-ray selected galaxy cluster XMMU J0338.8+0021 at z = 1.49 - indications of a young system with a brightest galaxy in formation-猫眼课题宝

DOI：

10.1051/0004-6361/201117292

发表时间：

2011-06

期刊：

Astronomy and Astrophysics

影响因子：

6.5

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

A. Nastasi;R. Fassbender;H. Bohringer;R. vSuhada;P. Rosati;D. Pierini;M. Verdugo;Joana S. Santos;A. Schwope;A. D. Hoon;J. Kohnert;G. Lamer;M. Muhlegger;H. Quintana

我们报道了一个位于z=1.490的星系团的发现，该星系团最初被选为XMM-牛顿遥远星系团的扩展X射线源。用VLT-FORS2型光谱仪进行的进一步观测使光谱确认了七个安全的星系团成员，提供了系统红移的中位数z=1.490±0.009。XMMUJ0338.8+0021的颜色-星等图显示，存在一个与z−H≈3填充良好的红色序列，尽管在颜色上有明显的散射。由于我们在这些天体中没有探测到任何强烈的恒星形成活动的迹象，颜色扩散可能代表了成员星系的不同恒星年龄。此外，我们发现最亮的星系团星系处于非常活跃的动力学状态，有一个相互作用的合并伙伴位于d≈20kpc的物理投影距离。根据X射线光度，我们估算出M200∼的质量为1.2×1014M�。数据似乎与XMMU J0338.8+0021的情况一致

We report the discovery of a galaxy cluster at z = 1.490 originally selected as an extended X-ray source in the XMM-Newton Distant Cluster Project. Further observations carried out with the VLT-FORS2 spectrograph allowed the spectroscopic confirmation of seven secure cluster members, providing a median system redshift of z = 1.490 ± 0.009. The color-magnitude diagram of XMMU J0338.8+0021 reveals the presence of a well-populated red sequence with z − H ≈ 3, albeit with an apparent significant scatter in color. Since we do not detect indications of any strong star formation activity in these objects, the color spread could represent the different stellar ages of the member galaxies. In addition, we found the brightest cluster galaxy in a very active dynamical state, with an interacting, merging companion located at a physical projected distance of d ≈ 20 kpc. From the X-ray luminosity, we estimate a cluster mass of M200 ∼ 1.2 × 10 14 M� . The data appear to be consistent with a scenario in which XMMU J0338.8+0021 is

Discovery of the X-ray selected galaxy cluster XMMU J0338.8+0021 at z = 1.49 - indications of a young system with a brightest galaxy in formation

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