期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 327, 期 2, 页码 663-668出版社
OXFORD UNIV PRESS
DOI: 10.1046/j.1365-8711.2001.04777.x
关键词
stars : formation; ISM : clouds; ISM : molecules; galaxies : ISM
In a recent paper, Elmegreen has made a cogent case, from an observational point of view, that the lifetimes of molecular clouds are comparable to their dynamical time-scales. If so, this has important implications for the mechanisms by which molecular clouds form. In particular, we consider the hypothesis that molecular clouds may form not by in situ cooling of atomic gas, but rather by the agglomeration of the dense phase of the interstellar medium, much, if not most, of which is already in molecular form.
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