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Title:
The properties of Lyα emitting galaxies in hierarchical galaxy formation models
Authors:
Le Delliou, M.; Lacey, C. G.; Baugh, C. M.; Morris, S. L.
Affiliation:
AA(Institute for Computational Cosmology, Department of Physics, University of Durham, South Road, Durham DH1 3LE; ), AB(Institute for Computational Cosmology, Department of Physics, University of Durham, South Road, Durham DH1 3LE; ), AC(Institute for Computational Cosmology, Department of Physics, University of Durham, South Road, Durham DH1 3LE; ), AD(Institute for Computational Cosmology, Department of Physics, University of Durham, South Road, Durham DH1 3LE; )
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 365, Issue 3, pp. 712-726. (MNRAS Homepage)
Publication Date:
01/2006
Origin:
MNRAS
MNRAS Keywords:
galaxies: evolution, galaxies: formation, galaxies: high-redshift, galaxies: luminosity function, mass function, cosmology: theory
Abstract Copyright:
(c) 2005 The Authors. Journal compilation © 2005 RAS
DOI:
10.1111/j.1365-2966.2005.09797.x
Bibliographic Code:
2006MNRAS.365..712L

Abstract

We present detailed predictions for the properties of Lyα-emitting galaxies in the framework of the Λ cold dark matter cosmology, calculated using the semi-analytical galaxy formation model GALFORM. We explore a model that assumes a top-heavy initial mass function in starbursts and that has previously been shown to explain the sub-millimetre 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 Lyα photons escape from each galaxy, is remarkably successful at explaining the observed luminosity function of Lyα emitters (LAEs) over the redshift range 3 < z < 6.6. We also examine the distribution of Lyα equivalent widths and the broad-band continuum magnitudes of emitters, which are in good agreement with the available observations. We look more deeply into the nature of LAEs, presenting predictions for fundamental properties such as the stellar mass and radius of the emitting galaxy and the mass of the host dark matter halo. The model predicts that the clustering of LAEs at high redshifts should be strongly biased relative to the dark matter, in agreement with observational estimates. We also present predictions for the luminosity function of LAEs at z > 7, a redshift range that is starting to be be probed by near-infrared surveys and using new instruments such as the Dark Ages Z Lyman Explorer (DAzLE).
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