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Feedback and Outflows

Published online by Cambridge University Press:  21 March 2013

Norman Murray
Norman Murray*
Affiliation:
Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St. George st., Toronto, ON, M5S 3H8, Canada email: murray@cita.utoronto.ca
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Abstract

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The low stellar and gas mass fractions, low galaxy-wide star formation rates (relative to galactic dynamical times) and observations of rapid outflows from galaxies, all suggest that stars and active galactic nuclei violently alter the state of the interstellar and even inter-halo gas in galaxies. I argue that the low galaxy wide star formation rates are not the result of turbulent suppression of star formation on small scale, but rather the result of a balance between dynamical pressure and the force (or rate of momentum deposition) provided by stellar feedback, either in the form of radiation pressure or by supernovae. Galaxy scale winds can also be driven by feedback, either from stars or active galactic nuclei, although the exact mechanisms involved are still not well determined.

Keywords

galaxies: formation — stars: formation — hydrodynamics — instabilities
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S292: Molecular Gas, Dust, and Star Formation in Galaxies , August 2012 , pp. 343 - 350
Copyright
Copyright © International Astronomical Union 2013

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