J = 4-3 HCN observations of M17 SW, DR 21/OH/, W51 and NGC 6334

Bibcode
1982MNRAS.199..375W
White, G. J.; Phillips, J. P.; Beckman, J. E.; Cronin, N. J.
Referencia bibliográfica

Monthly Notices of the Royal Astronomical Society, vol. 199, Apr. 1982, p. 375-383. Research supported by the Science Research Council.

Fecha de publicación:
4
1982
Revista
Monthly Notices of the Royal Astronomical Society
Número de autores
4
Número de autores del IAC
0
Número de citas
14
Número de citas referidas
14
Descripción
We report observations of NGC 6334N, Ml7 5W, W 51 and DR2l(OH) in the J = 4→3 transition of HCN at 354GHz. These results are combined with previously obtained J=1→0HCN data to determine molecular abundances X(HCN) ˜4 × 10-11 -4 × 10-12, and characteristic line excitation zone densities n(H2)˜106 cm-3. These results are at variance with previous analyses based on J=1→0 results alone, and the predictions of certain models of the cloud chemistry. The reasons for these discrepancies are discussed.
Tipo
Con árbitro
Nubes moleculares
Modelos astronómicos
Cosmoquímica

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