Physics
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf..113v&link_type=abstract
In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 113 (SEE N93-26706 10-90)
Physics
Dwarf Galaxies, Galactic Evolution, Galactic Halos, Intergalactic Media, Stellar Luminosity, Galactic Mass, Star Clusters, Star Formation
Scientific paper
The coupling of the Press and Schechter prescription with the CDM scenario and the Hoyle-Rees-Ostriker cooling criterion leads to a galaxy formation scenario in which galaxies are overproduced by a large factor. Although star formation might be suppressed in the smaller halos, a large amount of energy per galactic mass is needed to account for the present number density of galaxies. The evolution of the intergalactic medium (IGM) provides a simple criterion to prevent galaxy formation without requiring feedback, since halos with small virial temperatures are not able to retain the infalling hot gas of the IGM. If the ionizing background has decreased since z is approximately 1 - 2, then this criterion explains the slope of the luminosity function at the faint end. In addition, this scenario predicts two populations of dwarf galaxies, well differentiated in age, gas content, stellar populations, and clustering properties, which can be identified with dE and dIm galaxies.
Blanchard Alain
Mamon Gary
Valls-Gabaud David
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