The properties of Ly-alpha emitting galaxies in hierarchical galaxy formation models

Details The properties of Ly-alpha emitting galaxies in hierarchical galaxy formation models The properties of Ly-alpha emitting galaxies in hierarchical galaxy formation models

2005-08-08

arxiv.org/abs/astro-ph/0508186v2

Mon.Not.Roy.Astron.Soc.365:712-726,2006

Astronomy and Astrophysics

Astrophysics

16 pages, 8 figures. Accepted for publication in MNRAS. Revised in response to comments by referee. Main changes: new Fig.2 sh

Scientific paper

10.1111/j.1365-2966.2005.09797.x

We present detailed predictions for the properties of Ly-alpha-emitting galaxies in the framework of the Lambda-CDM cosmology, calculated using the semi-analytical galaxy formation model GALFORM. We explore a model which assumes a top-heavy IMF in starbursts, and which has previously been shown to explain the sub-mm number counts and the luminosity function of Lyman-break galaxies at high redshift. We show that this model, with the simple assumption that a fixed fraction of Ly-alpha photons escape from each galaxy, is remarkably successful at explaining the observed luminosity function of Ly-alpha emitters over the redshift range 37, a redshift range which is starting to be be probed by near-IR surveys and using new instruments such as DAzLE.

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