Synthesis of H2 at the edge of dense cold clouds by cosmic ray bombardment of grain mantles

Details Synthesis of H2 at the edge of dense cold clouds by cosmic ray bombardment of grain mantles Synthesis of H2 at the edge of dense cold clouds by cosmic ray bombardment of grain mantles

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...245..239a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 245, no. 1, May 1991, p. 239-242.

Astronomy and Astrophysics

Astrophysics

7

Cosmic Rays, Hydrogen, Interstellar Matter, Molecular Clouds, Cosmochemistry, Hydrogen Atoms, Ice, Recombination Reactions

Scientific paper

Production rates of molecular hydrogen obtained via low energy (E less than 1 GeV) cosmic rays interaction with interstellar dust mantles are obtained and compared with those deduced considering recombination of absorbed H atoms on amorphous grain surfaces at the edge, depth A(V) less than 2 mag, of a dense cloud. The grain model used is that of Greenberg (1979), which has an organic refractory layer rich in hydrogen between the core and the icy mantle. The result of the Monte Carlo simulation performed here is that recombination is dominant over the sputter production of molecular hydrogen only in a restricted range of depths. In particular, this second mechanism is more efficient at the external edge of the cloud.

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