Photoionization of a Clumpy Universe

3-D Radiative Transfer
  • T. Nakamoto
  • H. Susa
  • M. Umemura
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 263)


The ionization structure in a CDM-dominated universe is calculated self-consistently by solving 3D radiative transfer equation for UV photons. It is found that the reionization of a clumpy universe is quite sensitively dependent upon the intensity of the UV background which is thought to be attributed to quasars. If the universe is photoionized overall at early epochs by quasar light, the formation of subgalactic objects like dwarf galaxies could be strongly suppressed. Hence, in the light of the present luminosity function of galaxies, the formation of quasars should not be much earlier than the formation of galaxies.

Key words

Cosmology Diffuse Radiation Cosmology Early Universe Galaxies Formation Radiative Transfer Ultraviolet 


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Copyright information

© Springer Science+Business Media Dordrecht 2001

Authors and Affiliations

  • T. Nakamoto
    • 1
  • H. Susa
    • 1
  • M. Umemura
    • 1
  1. 1.Center for Computational PhysicsUniversity of TsukubaJapan

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