Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...260..147g&link_type=abstract
Astrophysical Journal, Part 1, vol. 260, Sept. 1, 1982, p. 147-158.
Astronomy and Astrophysics
Astrophysics
40
Interstellar Matter, Molecular Clouds, Orion Nebula, Cyano Compounds, Cyanoacetylene, Emission Spectra, Infrared Radiation, Molecular Excitation
Scientific paper
Three rotational transitions from the v7 vibrationally excited state of HC3N have been detected in the Orion molecular cloud, where v7 lies about 320 K above the ground state. It is suggested that the vibrationally excited lines are produced in the same region responsible for the prominent low velocity shoulder on the ground vibrational state HC3N emission lines. Upon mapping this ground state feature, its peak is found to be located near the IR source IRc2. The small source size and close proximity to strong IR radiation sources in the KL region make IR absorption an important mechanism in the excitation of HC3N's vibrational levels, and statistical equilibrium and radiative transfer calculations indicate that IR absorption provides a satisfactory explanation of the v7 observations for IR source color temperatures greater than 150 K and effective filling factors of 0.2-0.5.
Deguchi Shigeki
Goldsmith Paul F.
Krotkov R.
Linke Richard A.
Snell Ronald L.
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