Herve Dole

Institut d'Astrophysique Spatiale, Orsay, France

Title:
Galaxy Evolution and Cosmic Background as seen in the Infrared with ISO

Abstract:
I will present the latest results from the FIRBACK deep survey, aimed at
the study of the Cosmic Infrared Background (CIB), performed at 170 microns
with ISO, as well as other deep surveys done with ISO, in particular
the source counts which shows strong evolution and the discovery of
the CIB fluctuations.

In the second part, I will present our phenomenological model
which fits the deepest 15, 170 and 850 microns source counts, as well as the
CIB, and predicts redshift distributions compatible with data. We use an
evolution of the Luminosity Function with the redshift which is dominated by
a bright starburst population centered at L~3.10^11 solar luminosities. This
population evolves strongly between redshifts z=0 to 1, and dominates galaxy
evolution in the range z= 1 to 3.

The agreement between our model predictions and existing data suggests that
the strong galaxy evolution observed in the mid-infrared to submillimetre range
is dominated by bright starburst galaxies, and discards classical pure
luminosity or density evolution models.



FIRBACK team at IAS includes also Guilaine Lagache and Jean-Loup Puget (PI)
and people from 13 other laboratories. More information on:
http://wwwfirback.ias.u-psud.fr