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

被引：68

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

来源：

ASTRONOMY & ASTROPHYSICS | 2011年 / 531卷

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.

引用

页数：4

共 33 条

[1] The LX-T relation and intracluster gas fractions of X-ray clusters [J].

Arnaud, M ;

Evrard, AE .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1999, 305 (03) :631-640

[2]

Baldi M, 2011, MNRAS, pL190

[3] SExtractor: Software for source extraction [J].

Bertin, E ;

Arnouts, S .

ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, 1996, 117 (02) :393-404

[4]

Brodwin M., 2010, APJ, V732, P33

[5]

CAVALIERE A, 1976, ASTRON ASTROPHYS, V49, P137

[6] Linking cluster formation to large-scale structure [J].

Colberg, JM ;

White, SDM ;

Jenkins, A ;

Pearce, FR .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1999, 308 (03) :593-598

[7]

Dekker H., 1986, SPIE, V627, P339

[8] A pan-chromatic view of the galaxy cluster XMMU J1230.3+1339 at z=0.975 [J].

Fassbender, R. ;

Boehringer, H. ;

Santos, J. S. ;

Pratt, G. W. ;

Suhada, R. ;

Kohnert, J. ;

Lerchster, M. ;

Rovilos, E. ;

Pierini, D. ;

Chon, G. ;

Schwope, A. D. ;

Lamer, G. ;

Muehlegger, M. ;

Rosati, P. ;

Quintana, H. ;

Nastasi, A. ;

de Hoon, A. ;

Seitz, S. ;

Mohr, J. J. .

ASTRONOMY & ASTROPHYSICS, 2011, 527

[9] The X-ray luminous galaxy cluster XMMU J1007.4+1237 at z=1.56 The dawn of starburst activity in cluster cores [J].