NOAO >   Observing Info >   Approved Programs >   2011A-0316

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Proposal Information for 2011A-0316


PI: Rebecca Koopmann, Union College, koopmanr@union.edu
Address: Physics Department, 807 Union St., Schenectady, NY 12308, USA

CoI: Rose Finn, Siena College
CoI: Mary Crone Odekon, Skidmore College
CoI: Martha Haynes, Cornell University
CoI: Aileen O'Donoghue, St. Lawrence University
CoI: Ron Olowin, St. Mary's College of California
CoI: Parker Troischt, Hartwick College
CoI: Tom Balonek, Colgate University
CoI: David Craig, West Texas A&M
CoI: Sarah Higdon, Georgia Southern University
CoI: Lyle Hoffman, Lafayette College
CoI: Katie Jore, U. Wisconsin - Stevens Point

Title: An H(alpha) Survey of Star Formation in Undergraduate ALFALFA Team Groups and Clusters

Abstract: We propose wide area H(alpha) and broadband R imaging with WIYN 0.9m+MOSAIC of 10 groups and poor clusters of galaxies whose environmental properties and member populations are under coordinated study by the Undergraduate ALFALFA Team. The target groups lie within both the ALFALFA and SDSS footprints and span a range of velocity dispersion, spiral fraction and X-ray luminosity. HI mapping by ALFALFA yields HI masses for detections and robust upper limits for non- detections while SDSS provides morphologies, colors and stellar masses. We will compare rates and spatial distributions of star formation derived from the H(alpha) imaging to other group properties (gas content, gas fraction, morphological asymmetry etc.) and to published results on field and rich cluster environments to probe the viability of mechanisms which act to alter galaxy morphology and evolution. By studying a larger range of group environments and considering the spatial distribution of star formation, this work will probe the mechanisms of gas depletion and morphological transformation within these intermediate density environments and the extended supercluster structures within which they are embedded.


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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