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Title:
The origin of dwarf galaxies, cold dark matter, and biased galaxy formation
Authors:
Dekel, A.; Silk, J.
Affiliation:
AA(Yale University, New Haven, CT; Weizmann Institute of Science, Rehovot, Israel), AB(California, University, Berkeley)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 1, 1986, p. 39-55. (ApJ Homepage)
Publication Date:
04/1986
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ABUNDANCE, COLD PLASMAS, DARK MATTER, DWARF GALAXIES, GALACTIC EVOLUTION, STELLAR WINDS, VIRGO GALACTIC CLUSTER, BIG BANG COSMOLOGY, GALACTIC STRUCTURE, LOCAL GROUP (ASTRONOMY), MASS TO LIGHT RATIOS, STELLAR EVOLUTION, SUPERNOVAE
DOI:
10.1086/164050
Bibliographic Code:
1986ApJ...303...39D

Abstract

The formation of dwarf, diffuse, metal-poor galaxies as a result of supernova-driven winds is reexamined in view of the accumulating data on the systematic properties of dwarfs in the Local Group and in the Virgo Cluster. The observed luminosity-radius-metallicity relations are found to be produced naturally inside dominant halos, with a mass-radius relation that resembles the predictions of the "cold" dark matter cosmological scenario. The critical condition for global gas loss as a result of the first burst of star formation is that the virial velocity be below a critical value on the order of 100 km s-1. In any hierarchial scenario for galaxy formation, this condition leads to two distinct classes of galaxies as observed: (1) the diffuse dwarfs which mostly originate from typical density perturbations; and (2) the normal, brighter galaxies which can originate only from the highest density peaks. This provides a statistical biasing mechanism for the preferential formation of bright galaxies in denser regions (clusters and superclusters).

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