Observations of heavy-element recombination lines in the Rho Ophiuchi dark cloud at 13 centimeters wavelength

Details Observations of heavy-element recombination lines in the Rho Ophiuchi dark cloud at 13 centimeters wavelength Observations of heavy-element recombination lines in the Rho Ophiuchi dark cloud at 13 centimeters wavelength

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206..109k&link_type=abstract

Astrophysical Journal, vol. 206, May 15, 1976, pt. 1, p. 109-113.

Astronomy and Astrophysics

Astronomy

36

Abundance, Atomic Spectra, Heavy Elements, Interstellar Matter, Radiative Recombination, Radio Astronomy, Carbon, Emission Spectra, Line Spectra, Sulfur, Vapor Phases

Scientific paper

High-sensitivity observations at the carbon 140-alpha and 141-alpha recombination-line frequencies in the direction of the Rho Oph dust cloud show the presence of recombination lines of carbon and sulfur, but not of other heavy elements. These results require that the elements Si, Fe, and Mg are depleted by factors greater than 15, 10, and 2, respectively, most likely into interstellar grains, whereas sulfur is undepleted. They also require that only approximately one-sixth of the carbon is present in the gas phase in the cloud. From the observed size of the C II region together with the observed carbon depletion, it is inferred that the density in the carbon-line-emitting region is 25,000 per cu cm and that the size of the S II region is significantly larger than that of the C II region. The agreement between the widths of the recombination lines (which arise in a small region of the cloud) and those of the more widely distributed molecular species suggests that the lines in this cloud are broadened by microturbulence on a scale of much less than 0.1 pc.

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