Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21533003c&link_type=abstract
American Astronomical Society, AAS Meeting #215, #330.03; Bulletin of the American Astronomical Society, Vol. 42, p.428
Other
Scientific paper
The goal of my thesis is to determine the dominant formation mechanism of High Velocity Clouds and extragalactic HI clouds. Formation mechanisms include galaxy interactions, galactic fountains, dark-matter satellites, cold accretion, and cooling instabilities. To this end, I have carried out sensitive, wide-field neutral hydrogen observations of a sample of five nearby galaxy groups using the Green Bank Telescope. The galaxy groups span the range in level of ongoing galaxy interactions. The position, velocity, and mass distributions of clouds observed in these galaxy groups is compared statistically with the properties of clouds generated by simulations carried out by myself and others. Each simulation deals solely with one HI cloud formation mechanism, so the properties of clouds generated by a particular mechanism can be isolated. Our results indicate that galaxy interactions are a strong influence upon the number density of HI clouds in a galaxy group. The HI clouds we have detected are consistent with being generated by galaxy interactions, and we do not find clouds consistent with other generation mechanisms. In galaxy groups that are not known to be undergoing galaxy interactions, we do not detect HI clouds. This work is supported by the NRAO Pre-Doctoral Fellowship Program.
Chynoweth Katie M.
Holley-Bockelmann Kelly
Langston Glen
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