NOAO >   Observing Info >   Approved Programs >   2005A-0397

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Proposal Information for 2005A-0397


PI: Colleen Schwartz, University of California, Santa Barbara, colleen@physics.ucsb.edu
Address: Department of Physics, Broida Hall, Building 572, Goleta, CA 93106-9530, U.S.A.

CoI: Dr. Crystal L. Martin, University of California, Santa Barbara

Title: Quantifying Stellar Feedback on the Interstellar Medium in Nearby Galaxies: H(alpha) Kinematics in Normal Galaxies

Abstract: We will measure kinematics of the warm ionized gas in giant extragalactic HII regions via H(alpha) emission-line spectroscopy. With the high spectral and spatial resolution of the 4m Echelle spectrograph, we will be able to resolve individual bubbles and shells in the supernova-driven outflows from the star-forming regions. By taking spectra in steps across the region, we will able to create a map of the region both in physical space and in velocity space. We will characterize the kinematics of the star-forming regions, allowing us to identify the shells and bubbles and to constrain the amount of kinetic energy transported via supershells, on spatial scales of tens of parsecs to kiloparsecs. Feedback thus far as been studied mainly in starburst galaxies; this thesis observation comprises one of the first attempts to describe feedback empirically in more common star-forming environments. In particular, we want to relate the areal star formation rate and supershell velocity in the environment of a large disk galaxy, and compare this to the relation seen in a dwarf starburst. It will soon be possible to drastically improve upon measurements of the star formation per unit area in nearby galaxies using \em GALEX and \em Spitzer. Our observations will provide empirical measurements of the the gas kinematics for those same regions.


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 >   2005A-0397

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