2004/05/31 by Morgan Le Delliou, Cedric Lacey, C. G. Lacey +11 · 2 citations
Physics and Astronomy · #Abundance (ecology) #Biology #Ecology #Environmental science #Galaxies: Formation, Evolution, Phenomena #Geography #Scientific Research and Discoveries #astro-ph #astro-ph.CO
paper · pdf · doi:10.1111/j.1745-3933.2005.00007.x
published as Mon.Not.Roy.Astron.Soc.357:L11,2005 · version accepted 08/11/04 by MNRAS 1 figure added, revised figures and table 2; 3 figures, 5 pages Letter
arxiv created 2004/11/08 · openalex publication_date 2005/02/01 · arxiv updated 2015/01/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Abstract We present predictions for the abundance of Lyα emitters in hierarchical structure formation models. We use the GALFORM semi-analytical model of galaxy formation to explore the impact on the predicted counts of varying assumptions about the escape fraction of Lyα photons, the redshift at which the Universe reionized and the cosmological density parameter. A model with a fixed escape fraction gives a remarkably good match to the observed counts over a wide redshift interval. The counts at bright fluxes are dominated by ongoing starbursts. We present predictions for the expected counts in a typical observation with the Multi-Unit Spectroscopic Explorer (MUSE) instrument proposed for the Very Large Telescope.