Detection of high-excitation rotational lines of cyanoacetylene in the OMC 1 region

Details Detection of high-excitation rotational lines of cyanoacetylene in the OMC 1 region Detection of high-excitation rotational lines of cyanoacetylene in the OMC 1 region

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244l.107l&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 244, Mar. 1, 1981, p. L107-L110.

Astronomy and Astrophysics

Astrophysics

18

Acetylene, Cyano Compounds, Interstellar Matter, Molecular Clouds, Molecular Rotation, Molecular Spectra, Orion Nebula, Cyanoacetylene, Emission Spectra, Line Spectra, Molecular Excitation, Spectrum Analysis

Scientific paper

Six new high-excitation transitions of cyanoacetylene (HC3N) lying between 209 and 282 GHz have been detected toward OMC 1. Line widths are approximately 10 km/sec, broader than the low-frequency HC3N lines. Spectra of two low-frequency (82 and 91 GHz) HC3N transitions with a spatial resolution similar to that of the high-frequency transitions show both the broad feature and the more commonly seen narrow component. While the low-frequency HC3N transitions are spatially extended in OMC 1, the broad component of the high-frequency HC3N transitions appears to be confined to an unresolved region of approximately 1 arcmin or less. The intensities of the broad component are used to find the density and temperature of the broad-line-emitting region. The best fit to the HC3N line intensities yields TK = 125 K and a density greater than or equal to 10 to the 7th per cu cm.

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