The abundance of Lyman-(α) emitters in hierarchical models
arXiv:astro-ph/0405304 · doi:10.1111/j.1745-3933.2005.00007.x
Abstract
We present predictions for the abundance of Ly-$α$ emitters in hierarchical structure formation models. We use the {\tt GALFORM} semi-analytical model to explore the impact on the predicted counts of varying assumptions about the escape fraction of Ly-$α$ photons, the redshift at which the universe reionised and the cosmological density parameter. A model with a fixed escape fraction gives a remarkably good match to the observed counts over a wide redshift interval. We present predictions for the expected counts in a typical observation with the Multi Unit Spectroscopic Explorer instrument proposed for the Very Large Telescope.
version accepted 08/11/04 by MNRAS 1 figure added, revised figures and table 2; 3 figures, 5 pages Letter