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Population Synthesis Models for Late Build-Up of the Red Sequence

Justin J. Harker·Ricardo P. Schiavon·Benjamin J. Weiner·S. M. Faber
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Abstract

We present population synthesis models designed to represent the star formation histories of L* red sequence galaxies (RSGs). Earlier work has shown that single-burst stellar populations (SSPs) are unable to match Balmer line strengths simultaneously at high and low redshift. We therefore consider alternative star formation histories in which RSGs contain intermediate-aged stars even at late epochs. The models are compared to Balmer Hdelta absorption strengths, U-B color data, and the number density of red sequence galaxies from z=1 to z=0. We find that quenched models (which consist of constant star formation histories truncated at regularly-spaced intervals) average to an RSG population that matches the data well, showing slow evolution in color and Balmer line strength and a rise in number density by a factor of a few after z=1. The data are best fit by a turn-on of quenching at redshifts z=1.5-2.

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Justin J. Harker, Ricardo P. Schiavon, Benjamin J. Weiner, S. M. Faber. 2006-07-17. Population Synthesis Models for Late Build-Up of the Red Sequence. https://doi.org/10.1086/507581

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