Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-05-16
Mon.Not.Roy.Astron.Soc.357:L11,2005
Astronomy and Astrophysics
Astrophysics
version accepted 08/11/04 by MNRAS 1 figure added, revised figures and table 2; 3 figures, 5 pages Letter
Scientific paper
10.1111/j.1745-3933.2005.00007.x
We present predictions for the abundance of Ly-$\alpha$ 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-$\alpha$ 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.
Bacon Roland
Baugh Carlton M.
Courtois Hélène
Delliou Morgan Le
Guiderdoni Bruno
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