The contribution of galaxies to the IR background

Details The contribution of galaxies to the IR background The contribution of galaxies to the IR background

1997-07-11

arxiv.org/abs/astro-ph/9707134v1

Astronomy and Astrophysics

Astrophysics

10 pages, Latex, 8 postscript figures, to appear in "Extragalactic Astronomy in the IR", G. Mamon, T.X. Thuan and J. Tran Than

Scientific paper

A new semi-analytic modelling of galaxy evolution in the IR/submm is hereafter outlined. This type of approach successfully reproduces the optical properties of galaxies. We illustrate a simple extension to the IR/submm wavelength range by taking the case of the SCDM model. We design a family of evolutionary scenarios with star formation histories reproducing the evolution of the overall gas and luminosity densities in the universe. These scenarios are also consistent with IRAS data and preliminary ISO counts, and we use them to disentangle the ``Cosmic Infared Background'' detected by Puget et al. (1996) into discrete sources. We finally give predictions for the faint galaxy counts and redshift distributions in various submm wavelengths, which seem to be very sensitive to the details of the evolutionary scenarios. As a consequence, it is easy to anticipate that the current and forthcoming instruments, such as SCUBA, FIRST and PLANCK, will strongly constrain the evolution of high-redshift galaxies.

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