Constraints on the metagalactic hydrogen ionization rate from the Lyman-alpha forest opacity

Details Constraints on the metagalactic hydrogen ionization rate from the Lyman-alpha forest opacity Constraints on the metagalactic hydrogen ionization rate from the Lyman-alpha forest opacity

2005-04-20

arxiv.org/abs/astro-ph/0504437v1

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures, to appear in IAU 199 conf. proc.: "Probing Galaxies through Quasar Absorption Lines," eds. Williams, Shu,

Scientific paper

10.1017/S1743921305002620

Understanding the sources responsible for reionizing the Universe is a key goal of observational cosmology. A discrepancy has existed between the metagalactic hydrogen ionization rate, Gamma_HI, predicted by early hydrodynamical simulations of the Lyman-alpha forest if scaled to appropriate assumptions for the IGM temperature, when compared to values predicted from the proximity effect. We present new estimates for Gamma_HI in the redshift range 2

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