Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-07-22
Mon.Not.Roy.Astron.Soc.391:1589-1604,2008
Astronomy and Astrophysics
Astrophysics
17 pages, 18 figures. Accepted for publication in MNRAS. Minor revisions following referee's report. Replaced with version inc
Scientific paper
10.1111/j.1365-2966.2008.14010.x
We combine a semi-analytical model of galaxy formation with a very large simulation which follows the growth of large scale structure in a LambdaCDM universe to predict the clustering of Ly-alpha emitters. We find that the clustering strength of Ly-alpha emitters has only a weak dependence on Ly-alpha luminosity but a strong dependence on redshift. With increasing redshift, Ly-alpha 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 Ly-alpha emitters and study the sample variance of current and forthcoming surveys. We find that the number and clustering of Ly-alpha emitters in our mock catalogues are in agreement with measurements from current surveys, but that 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 Ly-alpha emitter clustering.
Baugh Carlton M.
Infante Leopoldo
Lacey Cedric G.
Orsi Alvaro
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