Quasar Absorption Line Studies of Starburst Galaxy Environments - Cycle 4 Carry-Over

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Hst Proposal Id #5704 Galaxies &Amp, Clusters Starbursts

Scientific paper

Starburst galaxies are now known to pump prodigious amounts of mass, energy, and momentum into their circumgalactic halos and the surrounding intergalactic medium. Outflows from starbursts are seen with both narrow band images and optical spectroscopic studies. The physics of these flows is fascinating. The most plausible explanation of their origin is that they are driven by a continuous energy and momentum input from the supernovae explosions. We propose here a coherent, in depth study of the physical state of these outflows. We shall study in detail the absorption line spectra of six quasars behind starburst outflows at projected galactocentric distances of order 10-100 kpc to learn about the ionisation state, metallicity, filling factor, geometry and kinematics of the outflowing gas. With HST the studies will be of comparable sensitvity and resolution to the studies of gas surrounding our own Galaxy and we emphasise that there is no other way to get the information needed to determine the physical state of these flows.

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