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The clustering of Lyα emitters in a ΛCDM Universe

Orsi, A.; Lacey, C.G.; Baugh, C.M.; Infante, L.

The clustering of Lyα emitters in a ΛCDM Universe Thumbnail


A. Orsi

L. Infante


We combine a semi-analytical model of galaxy formation with a very large simulation which follows the growth of a large-scale structure in a Λ cold dark matter (ΛCDM) universe to predict the clustering of Lyα emitters. We find that the clustering strength of Lyα emitters has only a weak dependence on Lyα luminosity but a strong dependence on redshift. With increasing redshift, Lyα emitters trace progressively rarer, higher density regions of the universe. Due to the large volume of the simulation, over 100 times bigger than any previously used for this application, we can construct mock catalogues of Lyα emitters and study the sample variance of current and forthcoming surveys. We find that the number and clustering of Lyα emitters in our mock catalogues are in agreement with measurements from current surveys, but there is a considerable scatter in these quantities. We argue that a proposed survey of emitters at z= 8.8 should be extended significantly in solid angle to allow a robust measurement of Lyα emitter clustering.


Orsi, A., Lacey, C., Baugh, C., & Infante, L. (2008). The clustering of Lyα emitters in a ΛCDM Universe. Monthly Notices of the Royal Astronomical Society, 391(4), 1589-1604.

Journal Article Type Article
Publication Date Dec 21, 2008
Deposit Date Jan 31, 2012
Publicly Available Date Jan 28, 2015
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 391
Issue 4
Pages 1589-1604
Keywords Methods: N-body simulations, Methods: numerical, Galaxies: evolution, Galaxies: high-redshift, Large-scale structure of Universe.


Published Journal Article (1.2 Mb)

Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2008 The Authors Published by Oxford University Press on behalf of The Royal Astronomical Society. All rights reserved.

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