Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...241l...5m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 241, no. 1, Jan. 1991, p. L5-L8.
Astronomy and Astrophysics
Astronomy
11
Carbon, Interstellar Chemistry, Ultraviolet Astronomy, Abundance, Carbon Monoxide, Electron Transitions, Hydrogen, Radiative Transfer, Very Large Array (Vla)
Scientific paper
A model consisting of clumps of gas rotating in an external ultraviolet field has been investigated in relation to the chemistry of C(+), C I and CO. A given volume element of the clump is effectively subjected to a periodic, sinusoidally oscillating ultraviolet radiation field. For clump sizes of 0.01-0.1 pc, rotating with velocities of about 1 km/s, it is shown that the carbon is continually recycled between c(+) and C I, never producing substantial amounts of CO, since the formation time of CO is slow relative to clump rotation periods. This represents a major mechanism for the production of substantial amounts of C I in the outer few A(v) of a cloud, in a region where it is generally supposed that all the carbon is in ionized form.
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