Faint galaxy evolution via interactions

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Cosmology, Dwarf Galaxies, Galactic Evolution, Interacting Galaxies, Red Shift, Starburst Galaxies, Astronomical Models, Luminosity, Star Formation

Scientific paper

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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