Journal Article

The Galactic initial mass function: origin in the combined mass distribution functions of dust grains and gas clouds

E. Casuso and J. E. Beckman

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 419, issue 2, pages 1642-1649
Published in print January 2012 | ISSN: 0035-8711
Published online December 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19828.x
The Galactic initial mass function: origin in the combined mass distribution functions of dust grains and gas clouds

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We present here a theoretical model to account for the stellar initial mass function (IMF) as a result of the composite behaviour of the gas and dust distribution functions. Each of these has previously been modelled and the models tested against observations (Casuso & Beckman 2002, 2007, 2010). The model presented here implies a relation between the characteristic size of the dust grains and the characteristic final mass of the stars formed within the clouds containing the grains, folded with the relation between the mass of a gas cloud and the characteristic mass of the stars formed within it. The physical effects of dust grain size are due to equilibrium relations between the efficiency of grains in cooling the clouds, which is a falling function of grain size, and the efficiency of grains in catalysing the production of molecular hydrogen, which is a rising function of grain size. We show that folding in the effects of grain distribution can yield a reasonable quantitative account of the IMF, while gas cloud mass function alone cannot do so.

Keywords: dust; extinction

Journal Article.  5800 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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