Observations of J = 4-3 rotational transition of interstellar cyanoacetylene

Details Observations of J = 4-3 rotational transition of interstellar cyanoacetylene Observations of J = 4-3 rotational transition of interstellar cyanoacetylene

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pazh....7..682t&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 7, Nov. 1981, p. 682-688.) Soviet Astronomy Letters, vol. 7, Nov.-Dec. 1981, p. 379-382

Astronomy and Astrophysics

Astronomy

2

Acetylene, Cyano Compounds, Electron Transitions, Galactic Radiation, Interstellar Matter, Radio Sources (Astronomy), Astronomical Spectroscopy, Brightness Temperature, Cyanoacetylene, Line Spectra, Milky Way Galaxy, Molecular Clouds, Molecular Energy Levels, Molecular Spectra, Radiant Flux Density

Scientific paper

The results of observations of the J = 4-3 rotational transition of interstellar cyanoacetylene in six galactic radio sources, as observed with the RT-22 radio telescope of the Lebedev Physics Institute, are presented. A filter spectrum analyzer operating as a 32 channel analyzer with 550 kHz resolution and as a 64 channel analyzer with 115 kHz resolution is used. A quantity evaluation procedure is outlined, and by comparing the intensities of lines at different frequencies, particle temperature and density at collision can be determined. Tables presenting computed brightness temperature of the HC3N line, source size, and kinetic temperature and molecular abundance data are included. It is found that the cloud detected in the J = 9-8 HC3N line in M17 has a high density, that a central condensation warmer than the outer layer is present in the cloud L1534, and that in IRC + 10216 the levels are excited by the infrared radiation of a central star. In addition, it is confirmed that the relative abundance of the HC3N molecule increases as cloud temperature and density decrease.

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