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The origin of dwarf galaxies, cold dark matter, and biased galaxy formation
Dekel, A.; Silk, J.
AA(Yale University, New Haven, CT; Weizmann Institute of Science, Rehovot, Israel), AB(California, University, Berkeley)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 1, 1986, p. 39-55. (ApJ Homepage)
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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
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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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