NOAO >   Observing Info >   Approved Programs >   2004A-0154

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Proposal Information for 2004A-0154


PI: Charles Hoopes, The Johns Hopkins University, choopes@pha.jhu.edu
Address: Department of Physics and Astronomy, 3400 N. Charles St., Baltimore, MD 21218, USA

CoI: David Thilker, The Johns Hopkins University
CoI: Salman Hameed, Smith College

Title: Revealing the Fossil Record of Chemical Evolution in Nearby Galaxies

Abstract: Abundance investigations of \ionH2 regions in spiral galaxies can strongly constrain chemical evolution and galaxy formation models. Progress in this important field has been hampered by the small number of galaxies studied (particularly early-type spirals) and the limited number of \ionH2 regions per galaxy that can be observed through long-slit spectroscopy. Multi-object spectroscopy of \ionH2 regions will greatly advance this field by allowing the simultaneous study of many \ionH2 regions per galaxy. We propose to obtain multi-object spectroscopy of 8 spiral galaxies (~20-40 \ionH2 regions per galaxy) in order to address important outstanding issues, such as: \bullet the variation of star formation histories in galaxies of different types, and the relationship between abundances and morphological properties (\it e.g. \ionH1 surface density, gas content etc.), \bullet the form of abundance gradients in the extreme outer reaches of spiral galaxies, and the similarity of such outer \ionH2 regions in late-type spirals with the inner disk \ionH2 regions in early-types, and \bullet the homogenizing effects of radial mixing in barred galaxies. The primary goal of our project is to use chemical abundances of \ionH2 regions to constrain formation and evolution scenarios for spiral galaxies.


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



NOAO >   Observing Info >   Approved Programs >   2004A-0154

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