Evolution of primordial protostellar clouds quasi-static analysis

Kazuyuki Omukai, Ryoichi Nishi, Hideya Uehara, Hajime Susa

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8 Citations (Scopus)


The contraction processes of metal-free molecular clouds of starlike mass (or cloud cores) are investigated. We calculate radiative transfer of the H2 lines and examine quasi-static contraction with radiative cooling. Comparing two time-scales, the free-fall time tff and the time-scale of quasi-static contraction tqsc (∼ tcool, the cooling time) of these cores, we find that the ratio of the two time-scales tff/tqsc, i.e., the efficiency of cooling, becomes larger with contraction even under the existence of cold and opaque envelopes. In particular, for fragments of primordial filamentary clouds, for which tff ∼ tqsc at the fragmentation epoch, they collapse dynamically in the free-fall time-scale. This efficiency of cooling is unique to line cooling.

Original languageEnglish
Pages (from-to)747-761
Number of pages15
JournalProgress of Theoretical Physics
Issue number5
Publication statusPublished - 1998 May


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