Other
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...284..135t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 284, Sept. 1, 1984, p. 135-140. Research supported by the University of Wyo
Other
17
Carbon Compounds, Emission Spectra, Interstellar Matter, Molecular Clouds, Stellar Evolution, Sulfides, Abundance, Millimeter Waves, Nebulae, Radio Spectra, Signal To Noise Ratios
Scientific paper
A survey of nine active star-forming regions has been performed, in order to determine whether high signal-to-noise millimeter wave spectra of C(12)S(32) high-velocity flows are also characterized by high densities (not less than 10 to the third per cubic cm). High signal-to-noise millimeter wave spectra (J = 2 to 1) were obtained using the NRAO 11 m telescope at Kitt Peak. The results show that three of the nine objects (Ori A, S140, and Cep A) exhibit broad Cs wings indicating high-velocity flows. The four other sources may have wings but at a level too weak to be detected with the NRAO telescope. It is suggested that for some sources, the CS abundance may be enhanced relative to that found in more quiescent parts of the star-forming regions. A rough model was used to estimate the column densities for the regions of high velocity flow. The results are considered to be in agreement with shock chemistry predictions of CS abundances.
Lada Charles J.
Thronson Harley A. Jr.
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