The Growth of Gas-rich Galaxies: Examining the Frequency, Demographics and Nature of Outlying HII Regions

Details The Growth of Gas-rich Galaxies: Examining the Frequency, Demographics and Nature of Outlying HII Regions The Growth of Gas-rich Galaxies: Examining the Frequency, Demographics and Nature of Outlying HII Regions

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21536805w&link_type=abstract

American Astronomical Society, AAS Meeting #215, #368.05; Bulletin of the American Astronomical Society, Vol. 42, p.558

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Recent UV and Halpha imaging shows that some galaxies contain stars in their remote gaseous outskirts, often beyond traditional gas-density thresholds for star formation. The most massive stars in these locations and their associated HII regions provide a unique opportunity to probe the star-formation history, evolution, and origin of the gas. Following a systematic search of a sample of "normal" gas-rich galaxies (SINGG), and a separate sample of interacting, disturbed, or extended HI-disk galaxies (HI Rogues), we have catalogued and confirmed over 50 outlying HII regions located far beyond the main optical components of galaxies (r > 2 x r25). Here, we present deep Halpha and GALEX images, multislit spectroscopy, and high-resolution HST HRC imaging, and discuss the frequency, demographics, and nature of outlying HII regions in gas-rich galaxies. We include an analysis of the stellar populations of these disk-building young star clusters, a detailed comparison between the Halpha and UV emission at large galactocentric radii, oxygen abundances of the gaseous outskirts of galaxies, and a calculation of the frequency of massive extended star formation in the local universe. Star formation in the outskirts of galaxies, as traced by Halpha emission, may represent a mode by which galaxies are building up a more luminous disk component much like the extended UV disks discovered by GALEX.

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