Journal Article

Intergalactic baryon-rich regions at high redshift

A. Gayler Harford, Andrew J. S. Hamilton and Nickolay Y. Gnedin

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 389, issue 2, pages 880-888
Published in print September 2008 | ISSN: 0035-8711
Published online September 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13608.x
Intergalactic baryon-rich regions at high redshift

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Using a high-resolution cosmological simulation of reionization, we have examined the differing structures formed by gas and dark matter at a redshift of 5.1. Baryon-rich regions form a small number of filaments, which connect the largest galaxies in the simulation. More detailed examination of the 10 largest galaxies reveals long, slender gaseous filaments about five proper kpc in width radiating from the galaxy centers. Extending out from each filament are a few smooth, thin, nearly planar gaseous sheets. By contrast, the dark matter concentrates into quasi-spherical bodies. The results have implications for our understanding of structure formation in the early Universe and of the Lyman α forest.

Keywords: galaxies: high-redshift; intergalactic medium; cosmology: theory; dark matter; large scale structure of Universe

Journal Article.  5420 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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