Molecular hydrogen in interstellar dark clouds

Details Molecular hydrogen in interstellar dark clouds Molecular hydrogen in interstellar dark clouds

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...207..745a&link_type=abstract

Astrophysical Journal, vol. 207, Aug. 1, 1976, pt. 1, p. 745-757.

Other

41

Cosmology, Diatomic Molecules, Hydrogen Clouds, Interstellar Matter, Nebulae, Astronomical Models, Chemical Equilibrium, Granular Materials, Hydrogen Recombinations, Molecular Excitation

Scientific paper

A simplified H2 formation mechanism is proposed in which small interstellar grains furnish the reaction sites. This mechanism results in a maximum value for the rate constant of about 2 by 10 to the -18th power per cu cm/sec for dark clouds at 10 K. Also, the nascent molecules are ejected in excited states, in qualitative agreement with Copernicus observations. A time-dependent treatment of the chemical evolution of a dark cloud with little or no ionizing radiation shows that the clouds require more than 10 million years to achieve chemical equilibrium. The observed residual atomic hydrogen in several dark clouds suggests that the clouds are 1 to 10 million years old. Other consequences of the temporal cloud model are in accord with astronomical observations.

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