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Star formation at low rates - the impact of lacking massive stars on stellar feedback

Published online by Cambridge University Press:  21 March 2017

Gerhard Hensler ,
Patrick Steyrleithner  and
Simone Recchi
Gerhard Hensler
Affiliation:
University of Vienna, Dept. of Astrophysics, Tuerkenschanzstr. 17, 1180 Vienna, Austria email: gerhard.hensler@univie.ac.at
Patrick Steyrleithner
Affiliation:
University of Vienna, Dept. of Astrophysics, Tuerkenschanzstr. 17, 1180 Vienna, Austria email: gerhard.hensler@univie.ac.at
Simone Recchi
Affiliation:
University of Vienna, Dept. of Astrophysics, Tuerkenschanzstr. 17, 1180 Vienna, Austria email: gerhard.hensler@univie.ac.at
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Abstract

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Due to their low masses dwarf galaxies experience low star-formation rates resulting in stellar cluster masses insufficient to fill the initial mass function (IMF) to the uppermost mass. Numerical simulations usually do not account for the completeness of the IMF, but treat a filed IMF by numbers, masses, and stellar feedback by fractions. To ensure that only entire stars are formed, we consider an IMF filled from the lower-mass regime and truncated where at least one entire massive star is formed.

By 3D simulations we investigate the effects of two possible IMFs on the evolution of dwarf galaxies: filled vs. truncated IMF. For the truncated IMF the star-formation self-regulation is suppressed, while the energy release by typeII supernovae is larger, both compared to the filled IMF. Moreover, the abundance ratios of particular elements yielded from massive and intermediate-mass stars differ significantly between the two IMF distributions.

Keywords

hydrodynamicsgalaxies: star formationgalaxies: star clustersgalaxies: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S321: Formation and Evolution of Galaxy Outskirts , March 2016 , pp. 99 - 101
Copyright
Copyright © International Astronomical Union 2017 

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