Dark cloud chemistry in initially H-rich regions

Details Dark cloud chemistry in initially H-rich regions Dark cloud chemistry in initially H-rich regions

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...391..681r&link_type=abstract

Astronomy and Astrophysics, v.391, p.681-687 (2002)

Astronomy and Astrophysics

Astrophysics

14

Ism: Clouds, Ism: Molecules, Astrochemistry, Molecular Processes

Scientific paper

The chemistry in dark regions of dense cores is explored as a function of the initial abundance ratio of H to H2, on the assumption that some cores form on a timescale and are younger than the time required for the H:H2 ratio to attain its equilibrium value. Observational diagnostics of non-equilibrium values of the initial H:H2 ratio are identified. In initially H-rich material, the abundances of OH, NH3, CN, and HNC are for some time higher than they are in initially H-poor material. In initially H-poor regions, the abundances of CO, species containing multiple carbon atoms in each molecule, and CS are larger for an (observationally significant) period than in initially H-rich material.

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