The nature of the molecular cores in high-altitude cirrus clouds. IV - The electron distribution and the abundance and chemistry of H2CO

Details The nature of the molecular cores in high-altitude cirrus clouds. IV - The electron distribution and the abundance and chemistry of H2CO The nature of the molecular cores in high-altitude cirrus clouds. IV - The electron distribution and the abundance and chemistry of H2CO

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...410..140t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 410, no. 1, p. 140-156.

Astronomy and Astrophysics

Astrophysics

31

Abundance, Cirrus Clouds, Electron Distribution, Formaldehyde, Interstellar Chemistry, Molecular Clouds, Astronomical Models, Atomic Excitations, Cosmic Dust, Interstellar Extinction, Radiation Distribution, Stellar Interiors

Scientific paper

Observations of 2 and 6-cm H2CO are successfully fitted to 11 cirrus cores for which detailed models of the structure and chemistry have been developed to explain C(O-18) and (C-13)O observations. It is shown that electron excitation of H2CO is an important factor in the H2CO analysis, without which a consistent model cannot be developed for H2CO and the CO isotopic species. It is found that the observed abundance X(0)(H2CO) = 6 x 10 exp -9, independent of radial distribution, is incompatible with gas formation of H2CO. It is concluded that gain processes are essential to explain the observed H2CO in cirrus cloud cores.

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