Journal Article

The clustering of Lyα emitters in a ΛCDM Universe

Alvaro Orsi, Cedric G. Lacey, Carlton M. Baugh and Leopoldo Infante

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 391, issue 4, pages 1589-1604
Published in print December 2008 | ISSN: 0035-8711
Published online December 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.14010.x
The clustering of Lyα emitters in a ΛCDM Universe

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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.

Keywords: methods: N-body simulations; methods: numerical; galaxies: evolution; galaxies: high-redshift; large-scale structure of Universe

Journal Article.  12394 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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