Evolution of Primordial Protostellar Clouds : Quasi-Static Analysis

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The contraction processes of metal-free molecular clouds of starlike mass (or cloud cores) are investigated. We calculate radiative transfer of the H_2 lines and examine quasi-static contraction with radiative cooling. Comparing two time-scales, the free-fall time t_<ff> and the time-scale of quasi-static contraction t<qsc> (〜 t_<cool>, the cooling time) of these cores, we find that the ratio of the two time-scales t_<ff>/t_<qsc>, 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 t_<ff> 〜 t_<qsc> at the fragmentation epoch, they collapse dynamically in the free-fall time-scale. This efficiency of cooling is unique to line cooling.
理論物理学刊行会の論文
1998-05-25