Cooling of hot protogalactic gas by the H2/+/ molecular ion

Details Cooling of hot protogalactic gas by the H2/+/ molecular ion Cooling of hot protogalactic gas by the H2/+/ molecular ion

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pazh....4..301s&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 4, July 1978, p. 301-303.) Soviet Astronomy Letters, vol. 4, July-Aug. 1978, p. 164, 16

Astronomy and Astrophysics

Astronomy

3

Hydrogen Ions, Interstellar Gas, Stellar Evolution, Atomic Collisions, Gas Cooling, Molecular Excitation, Molecular Ions

Scientific paper

The cooling rate of hot (temperature about 10,000 K) protogalactic gas, due to vibrational excitation of the H2(+) molecular ion by electron impact and by collisions with neutral hydrogen atoms and protons, is calculated. The cooling function and vibrational excitation rates of H2(+) are determined, and the H2(+) abundance in the hot protogalactic gas is estimated. The results show that collisions with neutral hydrogen atoms are the main mechanism for vibrational excitation of H2(+), that vibrational excitation of H2(+) would contribute about 2% to 5% of the total cooling rate at temperatures of 7000 to 8000 K, and that molecular hydrogen would make the main contribution at such temperatures. It is suggested that the H3(+) and HeH(+) molecular ions might also play an appreciable role in the cooling process under the conditions considered.

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