NOAO >   Observing Info >   Approved Programs >   2010B-0512

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Proposal Information for 2010B-0512


PI: John Salzer, Indiana University, slaz@astro.indiana.edu
Address: Astronomy Department, 727 E. Third Street, Swain West 319, Bloomington, IN 47405, USA

CoI: Martha Haynes, Cornell University
CoI: Eric Wilcots, University of Wisconsin
CoI: Riccado Giovanelli, Cornell University
CoI: Angela Parker, Indiana University

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

Abstract: 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.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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