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Published October 11, 2009 | Published
Journal Article Open

Gas in simulations of high-redshift galaxies and minihaloes

Abstract

We study the gas content of haloes in the early universe using high-resolution hydrodynamical simulations. We extract from the simulations and also predict, based on linear theory, the halo mass for which the enclosed baryon fraction equals half of the mean cosmic fraction. We find a rough agreement between the simulations and the predictions, which suggests that during the high-redshift era before stellar heating, the minimum mass needed for a minihalo to keep most of its baryons throughout its formation was ∼3 × 10^4 M_⊙ . We also carry out a detailed resolution analysis and show that in order to determine a halo's gas fraction even to 20 per cent accuracy, the halo must be resolved into at least 500 dark matter particles.

Additional Information

© 2009 The Authors. Journal compilation © 2009 RAS. Accepted 2009 June 18. Received 2009 June 18; in original form 2009 June 1. We wish to thank Greg Bryan for helpful conversations and comments on the paper. SN and RB acknowledge support by Israel Science Foundation grant 629/05 and U.S.–Israel Binational Science Foundation grant 2004386. RB is grateful for support from the Moore Distinguished Scholar program at Caltech and the John Simon Guggenheim Memorial Foundation. SN also acknowledges the support of the John Bahcall Graduate Student Prize. Support for this work was also partially provided by NASA through Hubble Fellowship grant HF-01222.01 to AM, awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555. We also acknowledge computational support from the National Center for Supercomputing Applications.

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