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Population Synthesis Models for Late BuildUp of the Red Sequence
Draft version February 5, 2008
A
Preprint typeset using L T X style emulateapj v. 6/22/04
E
POPULATION SYNTHESIS MODELS FOR LATE BUILD-UP OF THE RED SEQUENCE
1 1,2 1,3 1
Justin J. Harker , Ricardo P. Schiavon , Benjamin J. Weiner , S. M. Faber
Draft version February 5, 2008
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 HδF absorption strengths, U −B color data, and
6
0 the number density of red sequence galaxies from z = 1 to z = 0. We find that quenched models,
0 models of constant star formation histories truncated at regularly-spaced intervals, average to an RSG
2 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
l
u at redshifts z = 1.5 − 2.
J Subject headings: galaxies: evolution, galaxies: formation, galaxies: stellar content
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