Observations of the J equals 13-12 transition of HC7N at 14.7 GHz

Details Observations of the J equals 13-12 transition of HC7N at 14.7 GHz Observations of the J equals 13-12 transition of HC7N at 14.7 GHz

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....67l..23g&link_type=abstract

Astronomy and Astrophysics, vol. 67, no. 2, July 1978, p. L23.

Physics

5

Brightness Temperature, Cyano Compounds, Emission Spectra, Interstellar Radiation, Line Spectra, Microwave Spectra, Sagittarius Constellation, Cloud Physics, Molecular Excitation, Nebulae, Radial Velocity, Superhigh Frequencies

Scientific paper

Line emission due to the J equals 13-12 rotational transition of HC7N has been detected in Heiles Cloud 2 at the position of peak HC5N emission. The observed spectrum is smoothed to an effective resolution of 3 kHz (0.06 km/s in velocity), and a rest frequency of 14,663.984 MHz is obtained for the HC7N line center. A peak beam brightness temperature of approximately 0.60 K and a velocity half-width of about 0.45 km/s are determined from the profile of the J equals 13-12 transition; an upper limit of 5 K is placed on the excitation temperature. It is noted that HC7N emission with a peak beam brightness temperature of about 0.014 K at a velocity of 62 km/s and with a half-width of the order of 10 km/s may have been detected in the direction of Sgr B2 and that no emission exceeding 0.04 K in peak beam brightness temperature was observed in the Kleinmann-Low nebula, the dark cloud RCW 36, W Hydra, of NGC 6334.

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