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Star formation rates, laws, thresholds

Part of: IAU Issue 315 - From Interstellar Clouds...

Published online by Cambridge University Press:  12 September 2016

Stefanie Walch
Stefanie Walch*
Affiliation:
I. Physics Institute, University of Cologne Zülpicher Str. 77, 50937 Cologne email: [email protected]
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Abstract

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On scales of ≳ several hundred parsec, there are relatively well defined observed relations between the star formation rate surface density of a galaxy and its gas content. I present a short summary of the so-called ‘star formation laws’ and discuss the most established models to explain their origin. Nevertheless, none of the models can explain the offset of these relations, which requires a low star formation efficiency within the total and/or molecular gas. Stellar feedback is proposed to limit the star formation efficiency locally. I discuss the available feedback mechanisms and show recent simulation results on the evolution of the multi-phase interstellar medium under the influence of gravity, cooling, feedback-driven outflows and heating.

Keywords

stars: formationISM: supernova remnantsISM: generalISM: kinematics and dynamicsISM: structureturbulenceMHDgalaxies: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S315: From Interstellar Clouds to Star-Forming Galaxies: Universal Processes? , August 2015 , pp. 167 - 174
Copyright
Copyright © International Astronomical Union 2016 

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