The abundance of Lyman-(α) emitters in hierarchical models
Morgan Le Delliou, Cedric Lacey, Carlton M. Baugh, Bruno Guiderdoni, Roland Bacon, Helene Courtois, Thierry Sousbie, Simon L. Morris
Abstract
We present predictions for the abundance of Ly-α emitters in hierarchical structure formation models. We use the 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.
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