Cosmic Reionization and Galaxy Formation

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dc.creatorUmemura, M.
dc.creatorNakamoto, T.
dc.creatorSusa, H.
dc.date2001-08-10
dc.date.accessioned2026-07-07T01:59:37Z
dc.date.available2026-07-07T01:59:37Z
dc.descriptionUsing 3D radiative transfer calculations on the reionization of an inhomogeneous universe, QSO absorption line systems are simulated and they are compared with observations of Ly$α$ continuum depression at high redshifts. By this comparison, it is found that the metagalactic UV intensity decreases rapidly with $z$ at $z>4$ as $I_{21}=0.5\exp [3(4-z)]$, and the reionization must have taken place between $z=6$ and 10. Based on this time-dependence of UV background intensity, we explore the collapse of pregalactic clouds in the UV background, and find that the self-shielding is prominent above a mass scale as $ M_{BIF}=3.0\times 10^{11} M_\odot [(1+z_c)/5]^{-4.2}(I_{21}/0.5)^{0.6}. $ This mass scale predicts the bifurcation of galactic morphology, and by confrontation with observations it turns out that the bifurcation mass successfully discriminates between elliptical and spiral galaxies.
dc.descriptionA paper in "The Physics of Galaxy Formation", ASP Conf. Ser. 222, Eds. M. Umemura and H. Susa (ASP: San Francisco), pp.109-114
dc.identifierhttps://arxiv.org/abs/astro-ph/0108177
dc.identifierhttp://arxiv.org/abs/astro-ph/0108177
dc.identifier"The Physics of Galaxy Formation", ASP Conf. Ser. 222, Eds. M. Umemura and H. Susa (ASP: San Francisco), pp.109-114
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/3188
dc.subjectAstrophysics
dc.titleCosmic Reionization and Galaxy Formation
dc.typetext

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