Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9144c&link_type=abstract
HST Proposal ID #9144
Physics
1
Hst Proposal Id #9144 Galaxies
Scientific paper
One missing piece for placing star formation within the broader context of galaxy evolution is the quantification of the feedback mechanisms between a starburst and its host galaxy. We propose to obtain WFPC2 UV, V, and I broad-band and HAlpha, OIII, SII, and HBeta emission line images of three nearby, sub-L^*, starburst galaxies to: map the young stellar populations and star clusters, locate the obscuring dust clouds, and diagnose conditions in the ionized ISM. Our sample is carefully selected to probe a range of environments for the host galaxy, from isolated to group-interacting, for constant morphology, luminosity and metallicity. The galaxies are all closer than 4 Mpc, giving 2 pc resolution with the WF so we can chart the detailed structure of each starburst. This project is designed to: {a} establish whether starbursts are large-scale coherent or chaotic processes by investigating the presence of sequential/propagating star formation; and {b} explore the influence of the external environment on the evolution of the starburst. For this purpose we will measure: {1} the recent star formation history of both stellar clusters and young diffuse population; {2} the dust distribution; and {3} the structures in the shocked and photo-ionized gas. This study will provide a physical basis, in terms of energetics, evolution, and internal structures, for the interpretation of blue galaxies at intermediate and high redshifts.
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