THE MORPHOLOGY-DENSITY RELATION FOR GALAXIES IN A COLD DARK MATTER-DOMINATED UNIVERSE

被引:31
作者
EVRARD, AE
SILK, J
SZALAY, AS
机构
[1] UNIV CALIF BERKELEY, DEPT ASTRON, BERKELEY, CA 94720 USA
[2] UNIV CALIF BERKELEY, CTR PARTICLE ASTROPHYS, BERKELEY, CA 94720 USA
[3] JOHNS HOPKINS UNIV, DEPT PHYS & ASTRON, BALTIMORE, MD 21218 USA
[4] EOTVOS LORAND UNIV, DEPT PHYS, H-1364 BUDAPEST 5, HUNGARY
关键词
Cosmology; Dark matter; Galaxies: clustering; Galaxies: structure;
D O I
10.1086/169454
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We explore a model in which the observed galaxy morphology-density relation is intrinsically related to the initial fluctuations from which galaxies formed in a universe dominated by cold dark matter (CDM). We assume a direct mapping between initial peak height and final galaxy morphology with sharp thresholds dividing the principal Hubble types. Using a simplified, fully analytic formalism appropriate to Gaussian models, we show how a background cluster or group of galaxies may modulate the abundances of different morphological types. The model accounts for the observed power-law relation between the elliptical fraction and the combined fraction of elliptical and lenticular galaxies. We then extend this analytic approach using N-body simulations. The results support the validity of our prescription for differentiating disk from spheroidal galaxies. We note that a power-law segregation between luminous and dark matter densities is predicted by the simulations.
引用
收藏
页码:13 / 21
页数:9
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