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Patchy He II reionization and the physical state of the IGM | | Liron Gleser
; Adi Nusser
; Andrew J. Benson
; Hiroshi Ohno
; Naoshi Sugiyama
; | | Date: |
6 Dec 2004 | | Journal: | Mon.Not.Roy.Astron.Soc. 361 (2005) 1399-1414 | | Subject: | astro-ph | | Abstract: | We present a Monte-Carlo model of He II reionization by QSOs and its effect on the thermal state of the clumpy intergalactic medium (IGM). The model assumes that patchy reionization develops as a result of the discrete distribution of QSOs. It includes various recipes for the propagation of the ionizing photons, and treats photo-heating self-consistently. The model provides the fraction of He III, the mean temperature in the IGM, and the He II mean optical depth -- all as a function of redshift. It also predicts the evolution of the local temperature versus density relation during reionization. Our findings are as follows: The fraction of He III increases gradually until it becomes close to unity at $zsim 2.8-3.0$. The He II mean optical depth decreases from $ ausim 10$ at $zgeq 3.5$ to $ auleq 0.5$ at $zleq 2.5$. The mean temperature rises gradually between $zsim 4$ and $zsim 3$ and declines slowly at lower redshifts. The model predicts a flattening of the temperature-density relation with significant increase in the scatter during reionization at $zsim 3$. Towards the end of reionization the scatter is reduced and a tight relation is re-established. This scatter should be incorporated in the analysis of the Ly$alpha$ forest at $zleq 3$. Comparison with observational results of the optical depth and the mean temperature at moderate redshifts constrains several key physical parameters. | | Source: | arXiv, astro-ph/0412113 | | Services: | Forum | Review | PDF | Favorites | |
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