Detection of the J = 9-8 transition of interstellar cyanodiacetylene

Details Detection of the J = 9-8 transition of interstellar cyanodiacetylene Detection of the J = 9-8 transition of interstellar cyanodiacetylene

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.181p..33l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 181, Oct. 1977, p. 33P-35P.

Astronomy and Astrophysics

Astronomy

8

Acetylene, Cyano Compounds, Interstellar Matter, Radio Astronomy, Clouds, Cosmic Dust, Electron Transitions, Molecular Spectra, Thermodynamic Equilibrium

Scientific paper

This note reports the detection and preliminary mapping of the J = 9-8 transition of cyanodiacetylene at 23,963.888 MHz in the dark dust cloud Heiles 2. It is found that the line width is 0.63 km/s, the mean velocity of 5.9 km/s is near that previously obtained for hydroxyl, and the source is considerably extended in a position angle of approximately 150 deg. The observations are shown to be consistent with emission from a region that is at least 9 arcmin by approximately 2 arcmin in extent. A source brightness temperature of 4.8 K is estimated after correcting for the beam efficiency and a beam-dilution factor. The mass of cyanodiacetylene is determined to be at least 4 ten-millionths of a solar mass on the assumption that the source is an ellipsoid of uniform density.

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