Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20917801g&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #178.01; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
We present results from a survey of low mass dwarf galaxies selected from the Sloan Digital Sky Survey. These data represent the largest homogeneous sample of dwarf galaxies fainter than Mr > -16 with well-measured radio and optical properties. The sample spans a range of environments, from dense groups to truly isolated galaxies. The neutral gas fractions are on average significantly higher for these galaxies as compared to those of typical gas-rich galaxies at higher luminosities. Dwarf galaxies are therefore less efficient at turning gas into stars over their lifetimes. The strong environmental dependence of the gas fraction distribution in these dwarfs demonstrates that while internal processes can reduce gas fractions, external processes are required to fully remove gas from a dwarf galaxy. For a subset of this sample, we present VLA HI synthesis mapping in which we have measured the spatial extent of the HI gas and the two-dimensional gas dynamics. The VLA observations allow us to isolate and study environment-driven processes, such as ram pressure stripping, in these low mass galaxies.
Blanton Michael
Geha Marla C.
West Andrew A.
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