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Faint galaxy evolution via interactions
Carlberg, R. G.; Charlot, Stephane
AA(Toronto Univ., Canada), AB(Space Telescope Science Inst., Baltimore, MD)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 397, no. 1, p. 5-13. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Cosmology, Dwarf Galaxies, Galactic Evolution, Interacting Galaxies, Red Shift, Starburst Galaxies, Astronomical Models, Luminosity, Star Formation
Bibliographic Code:


Simple theoretical arguments are used here to model the effects of interaction-induced starbursts and of the progressive formation of galaxies on the faint galaxy properties in an Omega = 1 cosmology. It is shown that interactions and mergers brighten the numerous gas-rich dwarf galaxies at moderately high redshifts and may make the galaxy luminosity function depart significantly from the predictions of models which assume standard evolution. It is concluded that a marginally acceptable model describing the faint galaxy population is that present-day galaxies began to appear in large numbers at z about 3 and were thereafter subjected to interactions and minor mergers inducing starbursts, mostly in gas-rich, low-luminosity galaxies at a rate that declined by about an order of magnitude from z about 1 to the present.

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