Cooling mechanisms in the primordial medium

Details Cooling mechanisms in the primordial medium Cooling mechanisms in the primordial medium

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pazh....4..435s&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 4, Sept.-Oct. 1978, p. 435-440.) Soviet Astronomy Letters, vol. 4, Sept.-Oct. 1978, p.

Astronomy and Astrophysics

Astronomy

2

Cosmic Gases, Galactic Evolution, Gas Cooling, Hydrogen Clouds, Abundance, Energy Dissipation, Galactic Clusters, Gas Density, Molecular Ions

Scientific paper

Calculations are made for the abundance of H2 molecules and H2(+) ions in primordial matter and for the efficiency with which they would have cooled hot (temperature approximately 10,000 K) protogalactic gas. The main contribution to the cooling comes from the H2. The influence of the background radiation emanating from protoclusters of galaxies upon the H2 and H2(+) abundance is calculated. H2 molecules would have been formed in sufficient quantity when z = 2-3 if the protogalactic gas density was of the order of 10 per cu cm.

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