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- W2077821708 abstract "By depleting the ionizing photon budget available to expand cosmic HII regions, recombining systems (or Lyman limit systems) can have a large impact during (and following) cosmic reionization. Unfortunately, directly resolving such structures in large-scale reionization simulations is computationally impractical. Instead, here we implement a sub-grid prescription for tracking inhomogeneous recombinations in the intergalactic medium. Building on previous work parameterizing photo-heating feedback on star-formation, we present large-scale, semi-numeric reionization simulations which self-consistently track the local (sub-grid) evolution of both sources and sinks of ionizing photons. Our simple, single-parameter model naturally results in both an extended reionization and a modest, slowly-evolving emissivity, consistent with observations. Recombinations are instrumental in slowing the growth of large HII regions, and damping the rapid rise of the ionizing background in the late stages of (and following) reionization. As a result, typical HII regions are smaller by factors of $sim 2-3$ throughout reionization. The large-scale ($klesssim 0.2text{ Mpc$^{-1}$}$) ionization power spectrum is suppressed by factors of $gtrsim 2-3$ in the second half of reionization. Therefore properly modeling recombinations is important in interpreting virtually all reionization observables, including upcoming interferometry with the redshifted 21 cm line. Consistent with previous works, we find the clumping factor of ionized gas to be $C_{rm HII}sim 4$ at the end of reionization." @default.
- W2077821708 created "2016-06-24" @default.
- W2077821708 creator A5071294469 @default.
- W2077821708 creator A5085804235 @default.
- W2077821708 date "2014-03-25" @default.
- W2077821708 modified "2023-10-18" @default.
- W2077821708 title "Inhomogeneous recombinations during cosmic reionization" @default.
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- W2077821708 doi "https://doi.org/10.1093/mnras/stu377" @default.
- W2077821708 hasPublicationYear "2014" @default.
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