NOAO >   Observing Info >   Approved Programs >   2013A-0083

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Proposal Information for 2013A-0083


PI: Kristen McQuinn, University of Minnesota, kmcquinn@astro.umn.edu
Address: Minnesota Institute for Astrophysics, 116 Church St SE, Minneapolis, MN 55455, USA

CoI: Evan Skillman, University of Minnesota
CoI: Liese Van Zee, Indiana University

Title: Outflows in Nearby Starburst Dwarf Galaxies

Abstract: Starbursts are finite periods of intense star formation (SF) that can dramatically impact the evolutionary state of a galaxy, particularly in low-mass dwarf systems. Recently published results have redefined both the duration and spatial extent of starbursts in dwarf galaxies to be longer and more distributed than previously thought (McQuinn et al. 2010b, 2012). This new perspective puts renewed emphasis on understanding the impact of stellar feedback on the host galaxies and the surrounding IGM. We propose new, deep H(alpha) observations on the KPNO 4 m telescope on a sample of 10 nearby starburst dwarf galaxies to measure the frequency of starburst-driven outflows and to quantify the impact starbursts have on the ISM. The proposed H(alpha) survey will be able to detect low surface brightness features in the ionized ISM, going deeper than existing H(alpha) observations that were designed to study high surface brightness H\sc ii regions. These proposed data will be combined with existing temporally and spatially resolved star formation histories (SFHs) derived from HST imaging to directly connect the H(alpha) emission from the hot ionized gas with the SFHs. The survey will quantify SF feedback effects on the ISM, and provide constraints as to whether outflows are ubiquitous or rare in nearby starburst dwarfs. In addition we will add the reduced observations to our multi-wavelength, public data archive on starburst dwarf galaxies, hosted by the Minnesota Institute for Astrophysics.


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