Galaxy Evolution in the Infrared: Number Counts and the Cosmic Infrared Background

Details Galaxy Evolution in the Infrared: Number Counts and the Cosmic Infrared Background Galaxy Evolution in the Infrared: Number Counts and the Cosmic Infrared Background

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..204..303t&link_type=abstract

The Extragalactic Infrared Background and its Cosmological Implications, Proceedings of IAU Symposium #204, held 15-18 August 20

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Recently reported infrared galaxy number counts and the cosmic infrared background (CIRB) both suggest that galaxies have experienced a strong evolution phase. We statistically estimated the galaxy evolutionary history from these data. We treated the evolution of galaxy luminosity as a stepwise nonparametric form, in order to explore the most suitable evolutionary history which satisfies the constraint from the CIRB. We found that an order of magnitude increase of the far infrared luminosity at redshift z=0.75 - 1.0 was necessary to reproduce the very high CIRB intensity at ~ 150; μm reported by Hauser et al. (1998). We note that too large an evolutionary factor at high z overpredicts the CIRB intensity around 1 mm. The evolutionary history also satisfied the constraints from galaxy number counts obtained by IRAS, ISO and SCUBA. The rapid evolution of IR luminosity density required from CIRB well reproduced the very steep slope of galaxy number counts obtained by ISO. Based on this result and the evolution of optical luminosity density, we quantitatively discuss the contribution of starburst galaxies. In addition, we will present the performance of the Japanese IRIS galaxy survey.

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