The ALFALFA Hα Survey

Type Conference Paper
Names Angela Van Sistine, J. J. Salzer, S. Janowiecki, A. Sugden, M. P. Haynes, R. Giovanelli, E. M. Wilcots
Proceedings Title Bulletin of the American Astronomical Society
Conference Name AAS Meeting #222, #214.15
Volume 222
Date June 1, 2013
Library Catalog
Abstract The ALFALFA Hα survey uses a volume-limited sample of HI-selected galaxies from the ALFALFA survey to study star formation in the local universe. When complete, this survey will have narrow-band Hα images of over 1500 HI-selected galaxies with velocities between 1500 km/s and 7500 km/s. ALFALFA detects galaxies with HI masses as low as ~3x10^7 M_sol in our survey volume, probing well into the flat portion of the HI mass function. With our unique data set we are able to study star formation in a sample of galaxies selected to be capable of making stars and are unbiased to the optical properties of the galaxies. Our primary science goal is to produce the best possible measurement of the local star-formation rate density. We also use our data set to study star formation as a function of galaxy environment and compare UV and Hα star-formation rates (using GALEX). The ALFALFA Hα survey is ongoing, but is complete in the fall sky. Here we present an overview of the entire survey and results based on the fall sample.
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