Binary merging - The other mode of galaxy evolution

Details Binary merging - The other mode of galaxy evolution Binary merging - The other mode of galaxy evolution

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...407l...9c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 407, no. 1, p. L9-L12.

Astronomy and Astrophysics

Astrophysics

19

Cosmology, Galactic Evolution, Galactic Mass, Mass Distribution, Stellar Luminosity, Galactic Clusters, Galactic Structure, Gravitational Collapse, Star Distribution

Scientific paper

We discuss the mode of galaxy evolution based on merging after binary encounters, complementary to the mode based on direct hierarchical collapses. We show that the merging-driven mode produces, mainly by dynamical evolution, a local Schechter-like luminosity function starting at z of about 2 from a steep mass distribution like Press & Schechter's (1974). Such evolution inside galaxy systems provides a quantitative estimate of the Butcher-Oemler effect and yields an excess of faint blue galaxy counts like that observed.

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