Photoionization of a Clumpy Universe
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 wordsCosmology Diffuse Radiation Cosmology Early Universe Galaxies Formation Radiative Transfer Ultraviolet
Unable to display preview. Download preview PDF.
- Gunn, J.E., & Peterson, B.A. 1965, ApJ 142, 1633Google Scholar
- Nakamoto, T. 1997, in preparationGoogle Scholar
- Nakamoto, T., Susa, H. & Umemura, M. 1997, in preparationGoogle Scholar
- Kunasz, P.B. and Auer, L.H., 1988, J. Quant. Spectrosc. Radiant. Transfer 35, 431Google Scholar
- Schneider, D.P., Schmidt, M., & Gunn, J.E. 1991, ApJ 102, 837Google Scholar