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The stellar initial mass function

Published online by Cambridge University Press:  01 December 2006

Pavel Kroupa
Pavel Kroupa*
Affiliation:
Argelander-Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, D-53347 Bonn, Germany email: pavel@astro.uni-bonn.de
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Abstract

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The IMF UNIVERSALITY HYPOTHESIS cannot be discarded despite the existence of the CLUSTER IMF THEOREM. This means that the currently existing star-formation theory fails to describe the stellar outcome. The IGIMF THEOREM, however, predicts a variation of galaxy-wide IMFs in dependence of the galaxy's star-formation rate even if the IMF UNIVERSALITY HYPOTHESIS is valid. Taking indirect evidence from chemical evolution studies and the IGIMF THEOREM into account, it follows, however, that bulges and elliptical galaxies may have had a top-heavy IMF. A break-down of the IMF UNIVERSALITY THEOREM would thus be evident in extreme galaxy-wide (≳ 10 M⊙yr) star-formation events.

Keywords

stars: luminosity functionmass function – binaries: general – stars: formation – open clusters and associations: general – Galaxy: stellar content – Galaxy: evolution – galaxies: stellar content – galaxies: evolution – galaxies: star clusters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S241: Stellar Populations as Building Blocks of Galaxies , December 2006 , pp. 109 - 119
Copyright
Copyright © International Astronomical Union 2007

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