Journal Article

Mass–density relationship in molecular cloud clumps

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 418, issue 2, pages 916-928
Published in print December 2011 | ISSN: 0035-8711
Published online November 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19543.x
Mass–density relationship in molecular cloud clumps

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We study the mass–density relationship nmx in molecular cloud condensations (clumps), considering various equipartition relations between their gravitational, kinetic, internal and magnetic energies. Clumps are described statistically, with a density distribution that reflects a lognormal probability density function in turbulent cold interstellar medium. The clump mass–density exponent x derived at different scales L varies in most of the cases within the range −2.5 ≲x≲−0.2, with a pronounced scale dependence and in consistency with observations. When derived from the global size–mass relationship for set of clumps, generated at all scales, the clump mass–density exponent has typical values −3.0 ≲xglob) ≲−0.3 that depend on the forms of energy, included in the equipartition relations, and on the velocity scaling law, whereas the description of clump geometry is important when magnetic energy is taken into account.

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

Journal Article.  8744 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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