Intergalactic HI Clouds

Details Intergalactic HI Clouds Intergalactic HI Clouds

2005-02-16

arxiv.org/abs/astro-ph/0502306v1

IAU Symp 217, Eds. Duc, Braine and Brinks, 2004, Astron. Soc. Pac., p. 26

Astronomy and Astrophysics

Astrophysics

IAU Symp 217, July 2003, invited review

Scientific paper

Neutral intergalactic clouds are so greatly out numbered by galaxies that their integral HI content is negligible in comparison to that contained in optically luminous galaxies. In fact, no HI cloud that is not associated with a galaxy or grouping of galaxies has yet been identified. This points to a causal relationship that relies on gravitational potentials that bind galaxies also being responsible for confining HI clouds to sufficient density that they can become self-shielding to the ionizing background radiation. Unconfined clouds of low density become ionized, but confined clouds find themselves vulnerable to instability and collapse, leading to star formation.

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