91̽»¨

Abstract:

We predict the errors on counts-in-cells statistics measured in the future VIRMOS survey. Several effects are included, such as variation of clustering, biasing, and geometry. Most importantly for the survey strategy, sparse sampling appears to have no particular advantage in this case, especially for higher order statistics at high redshift. The predicted accuracy is a few percent for the variance, and about 10 percent for the skewness at z = 1 in a small dynamic range around 1 h(-1) Mpc.

Abstract:

We estimate the contribution of galaxies to the cosmic background flux at 912 Angstrom by means of an extended semi-analytic model of galaxy formation and evolution which takes into account the absorption of Lyman-limit photons by HI and dust in the interstellar medium (ISM) of the galaxies. We find that, though the background Lyman-limit flux escaping from galaxies is negligible compared to the flux from quasars at high redshifts, these two contributions become comparable at z similar or equal to 0.

Abstract:

The current and forthcoming observations of large samples of high-redshift galaxies selected according to various photometric and spectroscopic criteria can be interpreted in the context of galaxy formation, by means of models of evolving spectral energy distributions (SEDs). We hereafter present STARDUST which gives synthetic SEDs from the far UV to the submm wavelength range. These SEDs are designed to be implemented into semi-analytic models of galaxy formation.