Chemical modelling of molecular sources. IV - Time-dependent chemistry of dark clouds

Details Chemical modelling of molecular sources. IV - Time-dependent chemistry of dark clouds Chemical modelling of molecular sources. IV - Time-dependent chemistry of dark clouds

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.217..507m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 217, Nov. 15, 1985, p. 507-522. Research supported by t

Astronomy and Astrophysics

Astronomy

80

Astronomical Models, Interstellar Chemistry, Molecular Clouds, Time Dependence, Abundance, Chemical Reactions, Gas Density, Recombination Reactions, Temporal Distribution

Scientific paper

Time-dependent chemical models of dark, dense interstellar clouds are presented, and the main processes by which molecules form are described. It is shown that neutral carbon atoms play an important part not only in the formation of hydrocarbon species, but also in the destruction of O2 and NO. Since this latter molecule leads to N2, both O2 and N2 are low in regions in which C I is abundant. Models have also been calculated in which accretion of the gas on to grains is included and one model which assumes that a mechanism exists for returning CO and N to the gas. This calculation shows the interesting result that molecule formation from these species is sufficiently fast to overcome accretion. In general it is apparent that molecular abundances calculated for t approximately one-million yr do not agree well with those observed in TMC-1. The steady-state abundances, t for approximately 10-million yr, do, however, show reasonable agreement with observation. Finally, the calculations indicate that CH2CO and CCN might be detectable in TMC-1.

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