Undetected Sources Allow Transmission of the Lyman-alpha Line From Galaxies Prior to Reionization

Details Undetected Sources Allow Transmission of the Lyman-alpha Line From Galaxies Prior to Reionization Undetected Sources Allow Transmission of the Lyman-alpha Line From Galaxies Prior to Reionization

2004-07-08

arxiv.org/abs/astro-ph/0407162v2

Astrophys.J. 625 (2005) 1-5

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures. Submitted to ApJ

Scientific paper

10.1086/429529

The discovery of Lyman-alpha emission from galaxies at redshifts beyond z~6.5 should not be naively interpreted as implying that the intergalactic medium (IGM) had been reionized at higher redsifts. We show that a cluster of faint undetected sources around each observed galaxy generates an HII region sufficiently large to allow transmission of the galaxy's Lyman-alpha line prior to reionization. We also show that quasars may contribute a significant fraction of the ionizing photons to HII regions around galaxies with a velocity dispersion larger than ~100km/s. These contributing quasars are not usually seen due to the small fraction of time they spend in a luminous phase.

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