Other
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21460102b&link_type=abstract
American Astronomical Society, AAS Meeting #214, #601.02
Other
Scientific paper
With only the current reservoir of molecular gas, galactic star formation will cease much sooner than the decline of the observed star formation rate suggests. This is the molecular gas depletion problem. One aspect of the solution to this problem is including atomic hydrogen in the reservoir of gas for star formation. However, to form stars, the gas must be transported to the inner regions of galaxy disks: through inflow of HI from the outer disk or infall of intergalactic HI. We propose a mechanism for this is angular momentum loss through weak tidal interactions between galaxy group members. To constrain the contribution from this effect, we are imaging galaxy groups in the Local Volume (within 10 Mpc) in the 21 cm line with the ATA. This survey will look for extensions of the HI disks as well as intergalactic HI. The combination of the ATA's sensitivity and large beam make this instrument ideally suited for this project: we can easily image the whole group of galaxies in a small mosaic, with the potential of finding HI between group members that would be missed by other observations, which may be limited to mapping just the member galaxies and their immediate vicinity. Three groups of galaxies have been mapped so far, with good detections of HI in the member galaxies. No previously unknown intergalactic HI has been detected yet, but we expect that as our understanding of the instrument and data reduction processes improve, we will be able to get down to the expected column density limit of intergalactic HI and our observations will yield constraints on the amount of gas in the groups.
Allen Telescope Array Team
Bauermeister Amber
Blitz Leo
Keating Garrett
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