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Radiation-Hydrodynamical Simulations of Primordial Galaxy Formation in the UV Background

Published online by Cambridge University Press:  26 May 2016

Tetsu Kitayama ,
Hajime Susa ,
Masayuki Umemura  and
Satoru Ikeuchi
Tetsu Kitayama
Affiliation:
Department of Physics, Toho University, Funabashi 274-8510 Japan
Hajime Susa
Affiliation:
Center for Computational Physics, University of Tsukuba, Tsukuba 305-8577, Japan
Masayuki Umemura
Affiliation:
Center for Computational Physics, University of Tsukuba, Tsukuba 305-8577, Japan
Satoru Ikeuchi
Affiliation:
Department of Physics, Nagoya University, Nagoya 464-8602, Japan

Abstract

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We study the effects of the ultraviolet background radiation (UVB) on the formation of primordial galaxies, solving self-consistently radiative transfer of photons, non-equilibrium H2 chemistry, and one-dimensional hydrodynamics. The cut-off scale of collapse is shown to drop significantly compared to previous optically thin predictions, due to both self-shielding of the gas and H2 cooling. For plausible radiation intensities and spectra, the collapsing gas can cool efficiently to temperatures well below 104K before rotationally supported. Our results imply that star formation can take place in low-mass objects collapsing in the UVB.

Type
Posters
Information
Symposium - International Astronomical Union , Volume 208: Astrophysical Supercomputing using Particle Simulations , 2003 , pp. 417 - 418
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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