Detection of interstellar vibrationally excited HCN

Details Detection of interstellar vibrationally excited HCN Detection of interstellar vibrationally excited HCN

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...300l..19z&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 300, Jan. 1, 1986, p. L19-L23.

Astronomy and Astrophysics

Astrophysics

61

Abundance, Hydrocyanic Acid, Interstellar Matter, Molecular Oscillations, Orion Nebula, Electron Transitions, Stellar Envelopes

Scientific paper

Vibrationally excited HCN has been observed for the first time in the interstellar medium. The J = 3-2 rotational transitions of the l-doubled (0,11d,1c,0) bending mode of HCN have been detected toward Orion-KL and IRC +10216. In Orion, the overall column density in the (0,1,0) mode, which exclusivley samples the "hot core", is 1.7×1016cm-2 and can be understood in terms of the "doughnut" model for Orion. Radiative excitation by 14 μm flux from IRc2 accounts for the (0,1,0) population, provided the hot core is ≡ 6 - 7×1016cm distant from IRc2. Toward IRC +10216 the authors have detected J = 3-2 transitions of both (0,11c,1d,0) and (0,20,0) excited states.

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