Neutral Hydrogen in the Universe

Details Neutral Hydrogen in the Universe Neutral Hydrogen in the Universe

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005neco.conf..147b&link_type=abstract

THE NEW COSMOLOGY. Proceedings of the 16th International Physics Summer School. Held 3-14 February 2003 in Canberra, Australia.

Physics

Universe, Neutral Hydrogen

Scientific paper

Neutral atomic hydrogen is an endangered species at the present age of the Universe. When hydrogen is dispersed at low density in the intergalactic medium, the gas is vulnerable to photoionization, and once ionized, the time for recombination exceeds the Hubble time. If hydrogen clouds are confined to sufficient density that they are self-shielding to the ionizing background, they are vulnerable to instability, collapse and star formation, which over time, locks the hydrogen into long lived stars. When neutral clouds do exist after the Epoch of Reionization, they associate closely with galaxies; in these locations, they provide valuable kinematical tracers of the gravitational potentials that bind galaxies and groups.

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