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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2005

The abundance of Lyman-( \alpha ) emitters in hierarchical models

Résumé

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.
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Dates et versions

hal-00001563 , version 1 (14-05-2004)
hal-00001563 , version 2 (08-11-2004)

Identifiants

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Morgan Le Delliou, Cedric Lacey, Carlton M. Baugh, Bruno Guiderdoni, Roland Bacon, et al.. The abundance of Lyman-( \alpha ) emitters in hierarchical models. Monthly Notices of the Royal Astronomical Society, 2005, 357, pp.L11. ⟨10.1111/j.1745-3933.2005.00007.x⟩. ⟨hal-00001563v2⟩
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