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According to Galaxies in the Universe by Sparke & Gallagher (pp.392-393), when LBGs, with redshifts (3>z>2), reside within 300kpc of a sightline to earth, from a Quasar, then two-thirds show Lyman-alpha absorption from the QSO, whereas the other one-third do not. Perhaps those that do not have gaseous halos that have become fully ionized ? Such seems like relevant information which could potentially improve the article. 66.235.38.214 (talk) 08:12, 11 November 2012 (UTC)