Evolution of Primordial Protostellar Clouds --- Quasi-Static Analysis ---

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  • Omukai Kazuyuki
    Department of Physics, Kyoto University, Kyoto 606–8502, Japan
  • Nishi Ryoichi
    Department of Physics, Kyoto University, Kyoto 606–8502, Japan
  • Uehara Hideya
    Department of Physics, Kyoto University, Kyoto 606–8502, Japan
  • Susa Hajime
    Center for Computational Physics, University of Tsukuba Tsukuba 305–8577, Japan

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  • Evolution of Primordial Protostellar Cl

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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 H2 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.

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