Journal Article

Clump mass function at an early stage of molecular cloud evolution – I. A statistical approach

Sava Donkov, Todor V. Veltchev and Ralf S. Klessen

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 423, issue 1, pages 889-899
Published in print June 2012 | ISSN: 0035-8711
Published online May 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20939.x
Clump mass function at an early stage of molecular cloud evolution – I. A statistical approach

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We derive the mass function of condensations (clumps) which were formed through a turbulent cascade over a range of spatial scales L≤ 20 pc during early, predominantly turbulent evolution of a molecular cloud. The approach rests upon the assumption of a statistical clump mass–density relationship nmx with a scale dependence of the exponent x obtained from equipartition relations between various forms of energy of clumps. The derived clump mass function (ClMF) could be represented by series of two or three power laws, depending on the chosen equipartition relation, the velocity scaling index and the type of turbulent forcing. The high-mass ClMF exhibits an average slope Γ≃−1, typical for fractal clouds, whereas its intermediate-mass part is shallower or flattened, in agreement with some observational studies.

Keywords: turbulence; methods: statistical; ISM: clouds; ISM: structure

Journal Article.  6801 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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