Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...303...39d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 1, 1986, p. 39-55.
Astronomy and Astrophysics
Astronomy
1221
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
Scientific paper
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).
Dekel Avishai
Silk Joseph
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