XMM-Newton observation of a distant X-ray selected cluster of galaxies at z=1.26 with possible cluster interaction

被引:29
作者
Hashimoto, Y
Hasinger, G
Arnaud, M
Rostai, P
Miyaji, T
机构
[1] Astrophys Inst Potsdam, D-14482 Potsdam, Germany
[2] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany
[3] CEA Saclay, Serv Astrophys, F-91191 Gif Sur Yvette, France
[4] European So Observ, D-85748 Garching, Germany
[5] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA
关键词
galaxies : clusters : general; X-rays : galaxies; galaxies : evolution;
D O I
10.1051/0004-6361:20011536
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report on the XMM-Newton observation of RX J1053.7+5735, one of the most distant (z = 1.26) X-ray selected clusters of galaxies, which also shows an unusual double-lobed X-ray morphology, indicative of possible cluster-cluster interaction. The cluster was discovered during our ROSAT deep pointings in the direction of the Lockman Hole. The XMM-Newton observations were performed with the European Photon Imaging Camera (EPIC) during the performance verification phase. Total effective exposure time was similar to 100 ksec. The best fit temperature based on a simultaneous fit of spectra from all EPIC cameras (pn+MOS) is 4.9(-0.9)(+1.5) keV. Metallicity is poorly constrained even using the joint fit of all spectra, with an upper limit on the iron abundance of 0.62 solar. Using the best fit model parameters, we derived an unabsorbed (0.2-10) keV flux of f(0.2-10) = 3.0 x 10(14) erg cm(-2) s(-1), corresponding to a bolometric luminosity of L-bol = 3.4 x 10(44) h(50)(-2) erg s(-1). Despite the fact that it was observed at fairly large off-axis angle, the temperature errors are much smaller compared with those of typical measurements based on ASCA or Beppo-Sax observations of high-z (z >0.6) clusters, demonstrating the power of the XMM for determining the X-ray temperature for high-z clusters. The measured temperature and luminosity show that one can easily reach the intrinsically X-ray faint and cool cluster regime comparable with those of z similar to 0.4 clusters observed by past satellites. The new cluster temperature and L-bol we have measured for RX J1053.7+5735 is consistent with a weak/no evolution of the L-bol-T-x relation out to z similar to 1.3, which lends support to a low Omega(m) universe, although more data-points of z >1 clusters are required for a more definitive statement. The caution has to be also exercised in interpreting the result, because of the uncertainty associated with the dynamical status of this cluster.
引用
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页码:841 / 847
页数:7
相关论文
共 40 条
[31]  
RICKER PM, 2001, IN PRESS APJ
[32]   An X-ray-selected galaxy cluster at z=1.26 [J].
Rosati, P ;
Stanford, SA ;
Eisenhardt, PR ;
Elston, R ;
Spinrad, H ;
Stern, D ;
Dey, A .
ASTRONOMICAL JOURNAL, 1999, 118 (01) :76-85
[33]   The ROSAT deep cluster survey: The X-ray luminosity function out to z = 0.8 [J].
Rosati, P ;
Della Ceca, R ;
Norman, C ;
Giacconi, R .
ASTROPHYSICAL JOURNAL, 1998, 492 (01) :L21-L24
[34]  
ROSATI P, 1995, APJ, V445, P11
[35]   The wide-angle ROSAT pointed X-ray survey of galaxies, groups, and clusters .1. Method and first results [J].
Scharf, CA ;
Jones, LR ;
Ebeling, H ;
Perlman, E ;
Malkan, M ;
Wegner, G .
ASTROPHYSICAL JOURNAL, 1997, 477 (01) :79-92
[36]   The galaxy cluster luminosity-temperature relationship and iron abundances: A measure of formation history? [J].
Scharf, CA ;
Mushotzky, RF .
ASTROPHYSICAL JOURNAL, 1997, 485 (02) :L65-L68
[37]  
STANFORD SA, 2001, IN PRESS APJ
[38]   The ROSAT deep survey -: VII.: RX J105343+5735:: A massive cluster at z=1.263 [J].
Thompson, D ;
Pozzetti, L ;
Hasinger, G ;
Lehmann, I ;
Schmidt, M ;
Soifer, BT ;
Szokoly, G ;
Wilson, G ;
Zamorani, G .
ASTRONOMY & ASTROPHYSICS, 2001, 377 (03) :778-783
[39]  
VIKHLININ A, 1998, APJ, V502, P598
[40]   The LX-T and LX-σ relationships for galaxy clusters revisited [J].
Wu, XP ;
Xue, YJ ;
Fang, LZ .
ASTROPHYSICAL JOURNAL, 1999, 524 (01) :22-30