Discovery of a redshift 0.8 cluster of galaxies in the ROSAT north ecliptic pole survey

被引:51
作者
Henry, JP
Gioia, IM
Mullis, CR
Clowe, DI
Luppino, GA
Boehringer, H
Briel, UG
Voges, W
Huchra, JP
机构
[1] MAX PLANCK INST EXTRATERR PHYS,D-85740 GARCHING,GERMANY
[2] CTR ASTROPHYS,CAMBRIDGE,MA 02138
[3] CNR,IST RADIOASTRON,I-40129 BOLOGNA,ITALY
关键词
D O I
10.1086/118562
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report the discovery of RX J1716.6+6708, an X-ray emitting cluster of galaxies at a redshift of 0.813. This cluster is only the third such X-ray emitting object known at redshifts greater than 0.8. X-ray emitting clusters at extreme distances are of special importance because they are massive, comparable to low-redshift examples, and their existence is problematic for some theories of structure formation. The luminosity of RX J1716.6+6708 is 3.2X10(44) erg s(-1) and the velocity dispersion of its member galaxies, based on 12 redshifts, is 1892 km s(-1). The galaxies in RX J1716.6+6708 are spread along a filament perhaps indicating that it is more properly called a protocluster. (C) 1997 American Astronomical Society.
引用
收藏
页码:1293 / 1296
页数:4
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