Bimodal star formation - Constraints from galaxy colors at high redshift

Details Bimodal star formation - Constraints from galaxy colors at high redshift Bimodal star formation - Constraints from galaxy colors at high redshift

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319l...1w&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 319, Aug. 1, 1987, p. L1-L6. NASA-NSF-supported res

Astronomy and Astrophysics

Astronomy

19

Elliptical Galaxies, Galactic Evolution, Interstellar Magnetic Fields, Red Shift, Star Formation, Stellar Color, Astronomical Models, Radio Sources (Astronomy), Solar Neighborhood, Star Distribution, Stellar Mass

Scientific paper

The possibility that at early epochs the light from elliptical galaxies is dominated by stars with an initial mass function (IMF) which is deficient in low-mass stars, relative to the solar neighborhood is investigated. V-R colors for the optical counterparts of 3CR radio sources offer the most severe constraints on the models. Reasonable fits are obtained to both the blue, high-redshift colors and the redder, low-redshift colors with a model galaxy which forms with initially equal star formation rates in each of two IMF modes: one lacking low-mass stars, and one with stars of all masses. The net effect is that the time-integrated IMF has twice as many high-mass stars as the solar neighborhood IMF, relative to low mass stars. A conventional solar neighborhood IMF does not simultaneously account for both the range in colors at high redshift and the redness of nearby ellipticals, with any single star formation epoch. Models with a standard IMF require half the stellar population to be formed in a burst at low redshift z of about 1.

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