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Title:
The morphology-density relation for galaxies in a cold dark matter-dominated universe
Authors:
Evrard, A. E.; Silk, J.; Szalay, A. S.
Affiliation:
AA(California, University, Berkeley), AB(California, University, Berkeley), AC(Johns Hopkins University, Baltimore, MD; Eotvos Lorand Tudomanyegyetem, Budapest, Hungary)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 365, Dec. 10, 1990, p. 13-21. Research supported by the Miller Foundation for Basic Research in Science and OTKA. (ApJ Homepage)
Publication Date:
12/1990
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
DARK MATTER, GALACTIC CLUSTERS, GALACTIC STRUCTURE, SPACE DENSITY, MANY BODY PROBLEM, MORPHOLOGY, SPATIAL DISTRIBUTION
DOI:
10.1086/169454
Bibliographic Code:
1990ApJ...365...13E

Abstract

A model is explored 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). A direct mapping between initial peak height and final galaxy morphology with sharp thresholds dividing the principal Hubble types is assumed. Using a simplified, fully analytic formalism appropriate to Gaussian models, it is shown 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. This analytic approach is then extended using N-body simulations. The results support the validity of this prescription for differentiating disk from spheroidal galaxies. A power-law segregation between luminous and dark matter densities is predicted by the simulations.

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