Making Hay With ALFALFA: The Star-Formation Properties of an HI-Selected Galaxy Sample

Details Making Hay With ALFALFA: The Star-Formation Properties of an HI-Selected Galaxy Sample Making Hay With ALFALFA: The Star-Formation Properties of an HI-Selected Galaxy Sample

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010noao.prop..512s&link_type=abstract

NOAO Proposal ID #2010B-0512

Computer Science

Scientific paper

We are requesting time to carry out an extensive project of narrow- band H(alpha) imaging. Our primary goal is to derive the most accurate value possible for the local star-formation rate (SFR) density. Our target sample is drawn from ALFALFA, a blind HI survey being carried out using the Arecibo 305-m radio telescope. We argue that this HI-selected sample provides the best available catalog of sources to be used for measuring the SFR density since it detects all galaxies capable of making stars and is quite comprehensive. The current proposal builds upon our ongoing H(alpha) imaging project being executed on the WIYN 0.9-m telescope by including targets at higher redshifts. Extending the sample to cover a larger volume is essential for reducing the systematic errors in the SFR density caused by variations in large-scale structure. Our new sample will be combined with the images from our ongoing narrow- band project to yield one of the largest, most comprehensive sample of H(alpha) images available (>1100). Besides determining the definitive estimate of the local SFR density, we will also use the survey data to explore a number of additional science topics, such as modes of star formation in galaxies, the impact of large-scale environment on star formation, and the properties of point-like emission sources in our survey fields.

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