期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 423, 期 3, 页码 2579-2586出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2012.21061.x
关键词
stars: formation; ISM: clouds; ISM: structure
资金
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0908159] Funding Source: National Science Foundation
Despite over 30 yr of study, the massarea relationship within and among clouds is still poorly understood both observationally and theoretically. Modern extinction data sets should have sufficient resolution and dynamic range to characterize this relationship for nearby molecular clouds, although recent papers using extinction data seem to yield different interpretations regarding the nature and universality of this aspect of cloud structure. In this paper we try to unify these various results and interpretations by accounting for the different ways cloud properties are measured and analysed. We interpret the massarea relationship in terms of the column density distribution function and its possible variation within and among clouds. We quantitatively characterize regional variations in the column density probability distribution function (PDF). We show that structures both within and among clouds possess the same degree of universality, in that their PDF means do not systematically scale with structure size. Because of this, mass scales linearly with area.
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