Feeding Galaxies: Cold Accretion Through Warps

Details Feeding Galaxies: Cold Accretion Through Warps Feeding Galaxies: Cold Accretion Through Warps

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21932306r&link_type=abstract

American Astronomical Society, AAS Meeting #219, #323.06

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Scientific paper

Fueling the high star-formation rates observed in local galaxies remains a key issue of Lambda-CDM. Recent modeling suggests that the fueling gas may stream in through cold accretion flows. Because these flows may be misaligned with the galaxy disk, they should result in a warped disk. However, cold-flow accretions are not the only possible mechanism for creating warps. Other possible explanations include gravitational torques or gas-rich satellite mergers.
Using new HST observations of the resolved stellar populations in a disk warp, we constrain several of these models. Our best match is to a new simulation of cold-gas infall through a mildly rotating hot gaseous halo. These observations will thus help reveal the role of both hot and cold gas in fueling and forming galaxy disks.

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