Asymmetrical /C-13/O lines in dark clouds - Evidence for contraction

Details Asymmetrical /C-13/O lines in dark clouds - Evidence for contraction Asymmetrical /C-13/O lines in dark clouds - Evidence for contraction

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242.1013m&link_type=abstract

Astrophysical Journal, Part 1, vol. 242, Dec. 15, 1980, p. 1013-1018.

Computer Science

Sound

10

Carbon Isotopes, Carbon Monoxide, Contraction, Emission Spectra, Interstellar Gas, Molecular Clouds, Radiative Transfer, Astronomical Maps, Astronomical Models, Gas Density, Line Shape, Molecular Excitation, Sound Waves, Stellar Evolution

Scientific paper

Four 13CO spectra having similar and asymmetrical shapes (blueshifted peaks) were observed with 30 kHz resolution toward TMC2 and Ll34N. A radiative transfer model of a symmetric cloud indicates that each cloud is contracting along the two observed lines of sight. Contraction onto a static core fits the observed 13CO and C18O lines slightly better than contraction with υ ∝ r. The contraction speed ∼0.7 km s-1 and velocity dispersion ∼0.3 km s-1 are consistent with a 15 K cloud having a free-fall envelope and sonic turbulence.

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