Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202l..83m&link_type=abstract
Astrophysical Journal, vol. 202, Dec. 1, 1975, pt. 2, p. L83-L86.
Astronomy and Astrophysics
Astrophysics
33
Carbon Compounds, Cosmic Dust, Hydrogen Clouds, Interstellar Matter, Molecular Excitation, Sulfides, Astronomical Models, Galactic Structure, Molecular Spectra
Scientific paper
Results are reported for a survey of eight galactic dark clouds and dust globules conducted in the two rotational transitions of (C-12)(S-32) at 48,991 MHz and 97,981.01 MHz and the rotational transition of (C-12)(S-34) at 96,412.95 MHz. The surveyed sources included IC 1848-1, the Taurus dark cloud, Orion A, ORI-I-2, B227, L134, L121, B335, and B163. Carbon monosulfide emission was detected in all the clouds except B163, indicating that CS is widespread in dust clouds. Excitation temperatures of between 2.9 and 7.0 K are derived together with optical depths greater than unity, and molecular hydrogen densities greater than 10,000 per cu cm are deduced along with CS/H2 abundances of between 10 to the -8th power and 10 to the -9th power. The results are shown to be consistent with models in which line-of-sight flow velocities account for the observed line widths, the molecular transitions are optically thick, and radiation trapping becomes important.
Barrett Alan H.
Martin Robert N.
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