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• W1490251165 abstract "Searches for Lyα emission lines are among the most effective ways to identify high-redshift galaxies. They are particularly interesting because they probe not only the galaxies themselves but also the ionization state of the intergalactic medium: nearby neutral gas efficiently absorbs Lyα photons. The observed linestrengths depend on the amount by which each photon is able to redshift away from line centre before encountering neutral gas and hence on the size distribution of H ii regions surrounding the sources. Here, we use an analytic model of that size distribution to study the effects of reionization on the luminosity function of Lyα emitters and their observed spatial distribution. Our model includes the clustering of high-redshift galaxies and thus contains ionized bubbles much larger than those expected around isolated galaxies. As a result, Lyα-emitting galaxies remain visible earlier in reionization: we expect the number counts to decline by only a factor of ∼2 (or 10) when the mean ionized fraction falls to (or 0.5) in the simplest model. Moreover, the absorption is not uniform across the sky: galaxies remain visible only if they sit inside large bubbles, which become increasingly rare as decreases. Thus, the size distribution also affects the apparent clustering of Lyα-selected galaxies. On large scales, it traces that of the large bubbles, which in our model are more biased than the galaxies. On small scales, the clustering increases rapidly as decreases because large H ii regions surround strong galaxy overdensities, so a survey automatically selects only those galaxies with neighbours. The transition between these two regimes occurs at the characteristic bubble size. Hence, large Lyα galaxy surveys have the potential to measure directly the size distribution of H ii regions during reionization." @default.
• W1490251165 created "2016-06-24" @default.
• W1490251165 creator A5070588335 @default.
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• W1490251165 date "2006-01-21" @default.
• W1490251165 modified "2023-10-10" @default.
• W1490251165 title "The effects of reionization on Ly galaxy surveys" @default.
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• W1490251165 doi "https://doi.org/10.1111/j.1365-2966.2005.09785.x" @default.
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