Starburst--driven galactic outflows
Biman B. Nath (Raman Research Institute, India), Joseph Silk (Dept of, Astrophysics, University of Oxford, UK)

TL;DR
This paper introduces a combined radiation and thermal pressure model for starburst-driven galactic outflows, explaining observed wind speeds and properties in galaxies across different redshifts.
Contribution
It presents a novel model incorporating radiation pressure and supernova effects to better explain galactic outflows than previous thermal-only models.
Findings
Shell re-acceleration explains observed wind speeds.
Collision-induced shell fragmentation matches galaxy observations.
Model accounts for correlations in Lyman break galaxies.
Abstract
We propose a model of starburst--driven galactic outflows whose dynamics depends on both radiation and thermal pressure. Standard models of thermal pressure--driven winds fail to explain some key observations of outflows at low and high redshift galaxies. We discuss a scenario in which radiation pressure from massive stars in a stellar population drive a shell of gas and dust. Subsequent supernova (SN) explosions from the most massive stars in this population then drive stellar ejecta outward in a rarefied medium, making it collide with the radiation pressure driven shell. The collision imparts renewed momentum to the shell, and the resulting re-acceleration makes the shell Rayleigh-Taylor unstable, fragmenting the shell. We show that the speed of these ballistic fragments can explain some recently observed correlations in Lyman break galaxies between wind speed, reddening and star…
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