Strömgren Sphere in the Expanding Universe and a Possible Seed of Structure Formation

Details Strömgren Sphere in the Expanding Universe and a Possible Seed of Structure Formation Strömgren Sphere in the Expanding Universe and a Possible Seed of Structure Formation

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pthph..92...37s&link_type=abstract

Progress of Theoretical Physics, Vol. 92, No. 1, pp. 37-46.

Physics

2

Scientific paper

Formation of the Strömgren sphere by a massive star in the early universe after the recombination is studied. The quasi-stationary Strömgren sphere is formed in the stages of z > 101~2 for typical parameters of the universe model. The electron temperature Te in the HII region is kept equal to the cosmic background radiation temperature Tr by the Compton process. After this epoch, the ionisation front expands continuously and the quasi-stationary Strömgren sphere is not formed. Te can increase above Tr in this later stage. Transition feature is investigated in an analytic manner. In the case of the quasi-stationary Strömgren sphere, the HII region may generate a dense shell by the expansion due to pressure unbalance and a fragmentation of this shell could trigger further structure formation. This process occurs only for the small HII region.

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