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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)

Abstract

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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References

  1. Bajtlik.S, Duncan.R.C., Ostriker.J.P., 1988, ApJ 327, 570CrossRefGoogle Scholar
  2. Blumenthal, G.R., Dekel, A. & Primack, J.R. 1988, ApJ 326, 539CrossRefGoogle Scholar
  3. Giallongo, E., Cristiani, S., D’Odorico, S., Fontana, A., & Savaglio, S. 1996, ApJ 466, 46CrossRefGoogle Scholar
  4. Gunn, J.E., & Peterson, B.A. 1965, ApJ 142, 1633Google Scholar
  5. Jenkins, E.B., & Ostriker, J.P. 1991, ApJ 376, 33CrossRefGoogle Scholar
  6. Nakamoto, T. 1997, in preparationGoogle Scholar
  7. Nakamoto, T., Susa, H. & Umemura, M. 1997, in preparationGoogle Scholar
  8. Kunasz, P.B. and Auer, L.H., 1988, J. Quant. Spectrosc. Radiant. Transfer 35, 431Google Scholar
  9. Peebles, P.J.E. 1984, ApJ 277, 470CrossRefGoogle Scholar
  10. Pei, Y.C. 1995, ApJ 438, 623CrossRefGoogle Scholar
  11. Schneider, D.P., Schmidt, M., & Gunn, J.E. 1991, ApJ 102, 837Google Scholar
  12. Steidel, C.C., Sc Sargent, W.L.W. 1989, ApJ 343, L33CrossRefGoogle Scholar

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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