Deciphering the Origins of Unusually Extended HI Disks and Their Connection to Damped Ly(alpha) Systems

Details Deciphering the Origins of Unusually Extended HI Disks and Their Connection to Damped Ly(alpha) Systems Deciphering the Origins of Unusually Extended HI Disks and Their Connection to Damped Ly(alpha) Systems

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009noao.prop..226d&link_type=abstract

NOAO Proposal ID #2009A-0226

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Scientific paper

Galaxies with unusually extended HI disks (D_HI/D_B,25 > 5) have been found in both spiral and irregular galaxy types. However, due to a combination of small number statistics and serendipitous discovery, little has been done to establish how these galaxies differ from more normal ones, where the average HI-to-optical diameter ratio is ~2. In particular, it is not known whether the unusual extent of the gas disk is a result of the formation process or subsequent evolution. In order to better understand the nature and origins of these systems, we are using the ALFALFA survey to create an HI-selected sample of galaxies. Since this sample will contain both galaxies with normal and unusually extended HI disks, it is ideal for quantifying the differences between these two galaxy types and examining the range of impact parameters associated with gas disks. The observations we are proposing for here will be used to determine the star formation properties of a sample of 15 galaxies resolved by the Arecibo beam.

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