Stromgren Sphere in the Expanding Universe and a Possible Seed of Structure Formation | Zendy

Hirotoshi Sato | Zendy

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

Author(s) -

Hirotoshi Sato

Publication year - 1994

Publication title -

progress of theoretical physics

Language(s) - English

Resource type - Journals

eISSN - 1347-4081

pISSN - 0033-068X

DOI - 10.1143/ptp/92.1.37

Subject(s) - physics , structure formation , astrophysics , universe , metric expansion of space , shell (structure) , star formation , fragmentation (computing) , cosmology , galaxy , dark energy , materials science , computer science , composite material , operating system

12 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 Stromgren sphere is not formed. Te can increase above T, in this later stage. Transition feature is investigated in an analytic manner. In the case of the quasi-stationary Stromgren 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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