Discovery of a massive X-ray luminous galaxy cluster at z=1.579

被引:67
作者
Santos, J. S. [1 ]
Fassbender, R. [2 ]
Nastasi, A. [2 ]
Boehringer, H. [2 ]
Rosati, P. [3 ]
Suhada, R. [2 ]
Pierini, D. [2 ]
Nonino, M. [4 ]
Muehlegger, M. [2 ]
Quintana, H. [5 ]
Schwope, A. D. [6 ]
Lamer, G. [6 ]
de Hoon, A. [6 ]
Strazzullo, V. [7 ]
机构
[1] ESAC ESA, Madrid, Spain
[2] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany
[3] European So Observ, D-85748 Garching, Germany
[4] INAF Osservatorio Astron Trieste, I-34133 Trieste, Italy
[5] Pontificia Univ Catolica Chile, Dept Astron & Astrofis, Santiago 22, Chile
[6] AIP, D-14482 Potsdam, Germany
[7] CEA Saclay, Serv Astrophys, F-91191 Gif Sur Yvette, France
关键词
galaxies: clusters: individual: XMMUJ0044.0-2033; galaxies: high-redshift; X-rays: galaxies: clusters;
D O I
10.1051/0004-6361/201117190
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report on the discovery of a very distant galaxy cluster serendipitously detected in the archive of the XMM-Newton mission, within the scope of the XMM-Newton Distant Cluster Project (XDCP). XMMUJ0044.0-2033 was detected at a high significance level (5 sigma) as a compact, but significantly extended source in the X-ray data, with a soft-band flux f(r < 40 '') = (1.5 +/- 0.3) x 10(-14) erg s(-1) cm(2). Optical/NIR follow-up observations confirmed the presence of an overdensity of red galaxies matching the X-ray emission. The cluster was spectroscopically confirmed to be at z = 1.579 using ground-based VLT/FORS2 spectroscopy. The analysis of the I-H colour-magnitude diagram shows a sequence of red galaxies with a colour range [3.7 < I-H < 4.6] within 1' from the cluster X-ray emission peak. However, the three spectroscopic members (all with complex morphology) have significantly bluer colours relative to the observed red-sequence. In addition, two of the three cluster members have [OII] emission, indicative of on-going star formation. Using the spectroscopic redshift we estimated the X-ray bolometric luminosity, L-bol,L-40 '' similar to 5.8 x 10(44) erg s(-1), implying a massive galaxy cluster. This places XMMU J0044.0-2033 at the forefront of massive distant clusters, closing the gap between lower redshift systems and recently discovered proto-and low-mass clusters at z > 1.6.
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页数:4
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