NOAO >   Observing Info >   Approved Programs >   2009B-0270

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Proposal Information for 2009B-0270


PI: Liese van Zee, Indiana University, vanzee@astro.indiana.edu
Address: Department of Astronomy, 727 E 3rd St, Bloomington, IN 47405, USA

CoI: Andrew Marble, University of Arizona
CoI: Charles Englebracht, University of Arizona
CoI: Evan Skillman, University of Minnesota

Title: Dust Properties, Star Formation, and Chemical Enrichment of Low Luminosity Galaxies

Abstract: The recently completed Local Volume Legacy (LVL) survey has yielded multi-wavelength observations from the ultraviolet to the radio for a volume-complete sample of 258 galaxies in the local universe, providing detailed information about their star formation rates and dust content. We propose to leverage this rich dataset by obtaining oxygen abundance metallicity measurements for 28 of the lowest luminosity LVL galaxies, in order to investigate the relationship between dust properties, metallicity, and star formation at low-luminosity. Recent studies have suggested departures in this regime from known correlations at higher luminosity; however, these findings have been based on only a few low- luminosity galaxies. Specifically, although the weakening of the aromatic emission features in low luminosity galaxies has largely been ascribed to a metallicity effect, high star formation intensities could also produce the observed trends. The proposed observations will target low luminosity galaxies with low star formation rates (< 0.005 M_\odot yr^-1) in order to explore the full range of parameter space to determine if the observed behavior of the emission from the IR aromatic features is driven primarily by metallicity or star formation.


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 >   2009B-0270

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