Statistics of neutral regions during hydrogen reionization

@article{Nusser2002StatisticsON,
  title={Statistics of neutral regions during hydrogen reionization},
  author={Adi Nusser and Andrew J. Benson and Naoshi Sugiyama and Cedric G Lacey},
  journal={The Astrophysical Journal},
  year={2002},
  volume={580}
}
We present predictions for two statistical measures of the hydrogen reionization process at high redshift. The first statistic is the number of neutral segments identified in spectra of high-redshift QSOs as a function of their length. The second is the cross-correlation of neutral regions with possible sources of ionizing radiation. These independent probes are sensitive to the topology of the ionized regions. If reionization proceeded from high- to low-density regions, then the cross… 

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References

SHOWING 1-10 OF 24 REFERENCES
Non-uniform reionization by galaxies and its effect on the cosmic microwave background
We present predictions for the reionization of the intergalactic medium (IGM) by stars in high-redshift galaxies, based on a semi-analytic model of galaxy formation. We calculate ionizing
Polarization of the cosmic microwave background from nonuniform reionization.
We study the polarization anisotropy in the cosmic microwave background (CMB) resulting from patchy reionization of the intergalactic medium by stars in galaxies. It is well known that the
Signatures of Stellar Reionization of the Universe
The high ionization level and nonzero metallicity (~1% Z☉) of the intergalactic gas at redshifts z 5 implies that nonlinear structure had started to form in the universe at earlier times than we
Reionization of the Inhomogeneous Universe
A model of the density distribution in the intergalactic medium (IGM), motivated by that found in numerical simulations, is used to demonstrate the effect of a clumpy IGM and discrete sources on the
Cosmological Reionization by Stellar Sources
I use cosmological simulations that incorporate a physically motivated approximation to three- dimensional radiative transfer that recovers correct asymptotic ionization front propagation speeds for
Inhomogeneous reionization of the intergalactic medium regulated by radiative and stellar feedbacks
We study the inhomogeneous reionization in a critical density CDM universe resulting from stellar sources, including Population III objects. The spatial distribution of the sources is obtained from
Cosmic microwave background anisotropies resulting from feedback-regulated inhomogeneous reionization
We calculate the secondary anisotropies in the cosmic microwave background (CMB) produced by inhomogeneous reionization from simulations in which the effects of radiative and stellar feedback effects
On the Threshold of the Reionization Epoch
Discovery of the cosmic reionization epoch would represent a significant milestone in cosmology. We present Keck spectroscopy of the quasar SDSS 1044-0125, at z = 5.73. The spectrum shows a dramatic
Did the universe reionize at redshift six
Abstract In light of recent observations of spectra of the quasars SDSS 1030+0524 [J. Becker et al., AJ (2001), submitted] and SDSS 1044-0125 (Djorgovski et al., 2001), we study the observational
Evidence for reionization at z ∼ 6: Detection of a gunn-peterson trough in a z = 6.28 quasar
We present moderate-resolution Keck spectroscopy of quasars at z = 5.82, 5.99, and 6.28, discovered by the Sloan Digital Sky Survey (SDSS). We find that the Ly? absorption in the spectra of these
...
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2
3
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