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VELOCITY DISPERSIONS IN GALAXY CLUSTERS

被引：146
作者：
GIRARDI, M
BIVIANO, A
GIURICIN, G
MARDIROSSIAN, F
MEZZETTI, M
机构：
[1] UNIV TRIESTE,DIPARTIMENTO ASTRON,I-34127 TRIESTE,ITALY
[2] INT CTR THEORET PHYS,I-34100 TRIESTE,ITALY
来源：
ASTROPHYSICAL JOURNAL | 1993年 / 404卷 / 01期
关键词：
GALAXIES; CLUSTERING; DISTANCES AND REDSHIFTS;
D O I：
10.1086/172256
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We analyze the velocity dispersions of 79 galaxy clusters having at least 30 galaxies with available redshifts. We show that different estimates of velocity dispersion give similar results on cluster samples of at least approximately 20 galaxies each. However, only robust estimates of velocity dispersion seem to be efficient on cluster samples with approximately 10 galaxies each. A significant correlation is found to exist between the velocity dispersion and the cluster richness. We provide the distribution function of cluster velocity dispersions, normalized to the complete sample by Abell, Corwin, & Olowin (1989). Available theoretical models are compared with this distribution function.
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页码：38 / 50
页数：13
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