Models for Evolution of Dusty Galaxies and E/S0s Seen in Multiband Surveys

Details Models for Evolution of Dusty Galaxies and E/S0s Seen in Multiband Surveys Models for Evolution of Dusty Galaxies and E/S0s Seen in Multiband Surveys

2002-12-16

arxiv.org/abs/astro-ph/0212344v1

Astrophys.J. 587 (2003) 90-116

Astronomy and Astrophysics

Astrophysics

48 pages text, 24 figures. Accepted by ApJ. A PS file including all figures can be found in http://spider.ipac.caltech.edu/s

Scientific paper

10.1086/368069

Phenomenological models for evolution of dusty galaxies and E/S0 galaxies, respectively, are developed to address two major questions concenring galaxy populations in deep infrared (IR) surveys: (1) Do normal late-type galaxies or starburst galaxies (including galaxies with obscured AGNs) dominate among sources in deep IR surveys? (2) How much do E/S0 galaxies contribute to the counts in deep mid-infrared (MIR: 3 -- 20$\mu m$) surveys? Among three new models for evolution of dusty galaxies, it is assumed in Model S1 that starburst galaxies are the dominant population, and in Model S2 that normal galaxies dominate. Model S3 is an intermediate model. Comparing the model predictions with a wide range of observational data collected from the literature, we find that none of these models can be ruled out, given the uncertainties of the data. We show that the most direct method to distinguish these models is to compare the predicted color distributions of IR galaxies with observations, which will soon be available from the SWIRE survey. The models for E/S0 galaxies follow a simple passive evolution approach. Among the three E/S0 models (E1, E2 and E3) investigated in this paper, Model E2 which is specified by a peak formation redshift $z_{peak}=2$, and an e-folding formation time scale $\omega=2$ Gyr, fits the data best. This suggests a synchronization between the evolution of E/S0 galaxies and of starburst galaxies, in the sense that the peak of the formation function of E/S0s ($z_{peak}=2$) is close to the peak of the evolution functions of starburst galaxies ($z_{peak} = 1.4$). New predictions for counts and confusion limits in the SIRTF bands are presented.

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