Computer Science
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11146c&link_type=abstract
HST Proposal ID #11146. Cycle 16
Computer Science
Scientific paper
Stellar feedback - the return of mass and energy from star formation to the interstellar medium - is one of the primary engines of galaxy evolution. Yet, the observational canvass of feedback is incomplete. We propose to investigate this fundamental aspect of star formation on one local actively star-forming galaxy, He2-10, selected to occupy an unexplored niche in the key parameter space of stellar mass. The WFPC2 narrow-band observations in the light of H-beta, [OIII], H-alpha, and [SII] will: 1 discriminate the feedback-induced shock fronts from the photoionized regions; 2 map, and provide a complete census of, the shocks inside and around the starburst regions; and 3 measure the energy budget of the star-formation-produced shocks. These observations, joined by our previous data and studies on starbursts, will yield: 1 the efficiency of the feedback, i.e. the fraction of the star formation's mechanical energy transported out of the starburst volume rather than radiated away, in the dual-parameter space of host's stellar mass and star formation intensity; 2 the conditions under which feedback morphs from a localized process to a galactic scale mechanism. The high angular resolution of HST is crucial for separating the spatially narrow shock fronts ~10 pc=0.2" at 10 Mpc from the more extended photoionization fronts. This project will provide the most comprehensive quantitative foundation of stellar feedback and a gauge for determining the role of feedback in the energetics, structure and star formation history of galaxies.;
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