A2163 - AN EXCEPTIONALLY HOT CLUSTER OF GALAXIES

被引:55
作者
ARNAUD, M
HUGHES, JP
FORMAN, W
JONES, C
LACHIEZEREY, M
YAMASHITA, K
HATSUKADE, I
机构
[1] CENS,SERV ASTROPHYS,F-91191 GIF SUR YVETTE,FRANCE
[2] INST SPACE & ASTRONAUT SCI,SAGAMIHARA,KANAGAWA 229,JAPAN
[3] MIYAZAKI UNIV,FAC ENGN,MIYAZAKI 88920,JAPAN
关键词
DARK MATTER; GALAXIES-CLUSTERING; X-RAYS-GALAXIES;
D O I
10.1086/171285
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We measured the X-ray spectrum of the distant galaxy cluster A2163 in the energy range 1-18 keV with the Ginga satellite. A combined analysis of these data with data previously obtained with the Einstein Observatory is presented. The mean temperature and X-ray luminosity we derive are exceptionally high compared to other clusters: kT = 12.9 keV, L(X) (2-10 keV) = 3.5 x 10(45) ergs s-1 for z = 0.15, as are the gas mass (6.7 x 10(14) M.) and binding mass (25 x 10(14) M.). The very existence of such a cluster can provide interesting constraints on the relative distribution of "visible" mass and dark matter, an important parameter in cold dark matter models for formation of structure in the universe.
引用
收藏
页码:345 / 349
页数:5
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