Reionization Bias in High Redshift Quasar Near-Zones

Details Reionization Bias in High Redshift Quasar Near-Zones Reionization Bias in High Redshift Quasar Near-Zones

2007-08-14

arxiv.org/abs/0708.1788v1

Astronomy and Astrophysics

Astrophysics

16 Pages, 9 figures. Submitted for publication to MNRAS

Scientific paper

Absorption spectra of high redshift quasars exhibit an increasingly thick Ly-alpha forest towards z~6. However, the interpretation of these spectra is complicated by the fact that the Ly-alpha optical depth is already large for neutral hydrogen fractions in excess of 10^-4, and also because quasars are expected to reside in dense regions of the IGM. We present a model for the evolution of the ionization state of the IGM which is applicable to the dense, biased regions around high-redshift quasars as well as more typical regions in the IGM, and combine this with numerical radiative transfer simulations. Our model is able to simultaneously reproduce the observed Ly-alpha forest opacity at 4

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