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The effects of early reionization on the formation of dwarf galaxies

Published online by Cambridge University Press:  08 November 2005

H. Susa  and
M. Umemura
H. Susa
Affiliation:
Department of Physics, College of Science, Rikkyo University, Nishi-Ikebukuro, Toshimaku, Tokyo, Japan email: [email protected]
M. Umemura
Affiliation:
Center for Computational Science, University of Tsukuba, Tsukuba, Japan email: [email protected]
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Abstract

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We consider the feedback effects of the early reionization on the formation of small galaxies. For this purpose, we perform 3D radiation hydrodynamic simulations with incorporating the radiative transfer for ionizing photons. As a result, it is found that the early reionization is so devastating for low mass systems with $M_{\rm vir} \lesssim 10^8 M_\odot$ or $v_{\rm circ} \lesssim 20 {\rm km/s}$, and almost all gas is photo-evaporated in more than 95% of low mass systems. These results indicate that the low mass dwarf galaxies are not formed directly from isolated CDM density perturbations.

Keywords

radiative transfermethods: numericalgalaxies: dwarfformation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C198: Near-Field Cosmology with Dwarf Elliptical Galaxies , March 2005 , pp. 147 - 150
Copyright
© 2005 International Astronomical Union