Cooling of Pre-Galactic Gas Clouds by Hydrogen Molecule
Open Access
- 1 August 1969
- journal article
- Published by Oxford University Press (OUP) in Progress of Theoretical Physics
- Vol. 42 (2) , 219-233
- https://doi.org/10.1143/PTP.42.219
Abstract
According to the expanding hot universe model, neutralization of the cosmic plasma ceases at the stage of radiation temperature Tγ ≃4000°K. After then, a density contrast in the uniform medium grows into a contracting gas could with mass greater than 105 ∼6M⊙. Hydrogen molecule is formed in the cloud after the stage of Tγ≃300°K, and the thermal evolution is largely affected by the cooling through H2, whose processes are studied quantitatively in this paper. The present paper is a preliminary one for a more interesting problem of galaxy formation.Keywords
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