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• W1971396114 abstract "The reionization of hydrogen in the intergalactic medium (IGM) is a crucial landmark in the history of the Universe, but the processes through which it occurs remain mysterious. In particular, recent numerical and analytic work suggest that reionization by stellar sources is driven by large-scale density fluctuations and must be inhomogeneous on scales of many comoving Mpc. We examine the prospects for constraining the topology of neutral and ionized gas through Lya absorption of high-redshift sources. One method is to search for gaps in the Gunn-Peterson absorption troughs of luminous sources. These could occur if the line of sight passes sufficiently close to the centre of a large HII region. In contrast to previous work, we find a non-negligible (though still small) probability of observing such a gap before reionization is complete. In our model the transmission spike at z = 6.08 in the spectrum of SDSS J1148+5251 does not necessarily require overlap to have been completed at an earlier epoch. We also examine the IGM damping wing absorption of the Lya emission lines of star-forming galaxies. Because most galaxies sit inside of large H II regions, we find that the severity of absorption is significantly smaller than previously thought and decoupled from the properties of the observed galaxy. While this limits our ability to constrain the mean neutral fraction of the IGM from observations of individual galaxies, it presents the exciting possibility of measuring the size distribution and evolution of the ionized bubbles by examining the distribution of damping wing optical depths in a large sample of galaxies." @default.
• W1971396114 created "2016-06-24" @default.
• W1971396114 creator A5070588335 @default.
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• W1971396114 date "2004-11-01" @default.
• W1971396114 modified "2023-09-24" @default.
• W1971396114 title "Constraining the topology of reionization through Lyα absorption" @default.
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• W1971396114 doi "https://doi.org/10.1111/j.1365-2966.2004.08225.x" @default.
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