The Cosmological Context of Extraplanar Gas

Details The Cosmological Context of Extraplanar Gas The Cosmological Context of Extraplanar Gas

2004-09-27

arxiv.org/abs/astro-ph/0409639v1

Astronomy and Astrophysics

Astrophysics

8 pages to appear in "Extraplanar Gas", ed. R. Braun, ASP Conf. Procs

Scientific paper

I review evidence that galaxies form from gas that falls into potential wells cold, rather than from virialized gas, and that formation stops once an atmosphere of trapped virialized gas has accumulated. Disk galaxies do not have such atmospheres, so their formation is ongoing. During galaxy formation feedback is an efficient process, and the nuclear regions of disk galaxies blow winds. The cold infalling gas that drives continued star formation has a significant component of angular momentum perpendicular to that of the disk. Extraplanar gas has to be understood in the context set by nuclear outflows and cold skew-rotating cosmic infall.

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