Models for High-Redshift Lyman Alpha Emitters

Details Models for High-Redshift Lyman Alpha Emitters Models for High-Redshift Lyman Alpha Emitters

1998-11-25

arxiv.org/abs/astro-ph/9811396v2

Astronomy and Astrophysics

Astrophysics

4 pages, poster contribution to Proc. of 9th Annual October Astrophysics Conference in Maryland, "After the Dark Ages: When Ga

Scientific paper

10.1063/1.58635

We present models for dusty high-redshift Lyman alpha emitting galaxies by combining the Press-Schechter formalism with a treatment of inhomogeneous dust distribution inside galaxies. These models reproduce the surface density of emitters inferred from recent observations, and also agree with previous non-detections. Although a detailed determination of the individual model parameters is precluded by uncertainties, we find that (i) the dust content of primordial galaxies builds up in no more than 5x10^8 years, (ii) the galactic HII regions are inhomogeneous with a cloud covering factor of order unity, and (iii) the overall star formation efficiency is at least 5 percent. Future observations should be able to detect Lyman alpha galaxies upto redshifts of about z=8. If the universe is reionized at z(reion)<8, the corresponding decline in the number of Lyman alpha emitters at z>z(reion) could prove to be a useful probe of the reionization epoch.

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