Models for Multiband IR Surveys

Details Models for Multiband IR Surveys Models for Multiband IR Surveys

2000-09-14

arxiv.org/abs/astro-ph/0009220v2

Astronomy and Astrophysics

Astrophysics

40 pages latex. 32 GIF figures. New Version (July 8, 2001) to be accepted by ApJ. High quality figures (included in a PS file

Scientific paper

10.1086/323430

Empirical 'backward' galaxy evolution models for IR-bright galaxies are constrained using multiband IR surveys. A new Monte-Carlo algorithm is developed for this task. It exploits a large library of realistic Spectral Energy Distributions (SEDs) of 837 local IR galaxies (IRAS 25$\mu m$ selected) from the UV (1000{\AA}) to the radio (20cm), including ISO-measured 3--13$\mu m$ unidentified broad features (UIBs). The basic assumption is that the local correlation between SEDs and Mid-Infrared (MIR) luminosities can be applied to earlier epochs of the Universe. Three populations of IR sources are considered in the evolution models. These include (1) starburst galaxies, (2) normal late-type galaxies, and (3) galaxies with AGN. A set of models so constructed are compared with data from the literature. Predictions for number counts, confusion limits, redshift distributions, and color-color diagrams are made for multiband surveys using the upcoming SIRTF satellite.

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