Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...256..595s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 256, no. 2, p. 595-612.
Astronomy and Astrophysics
Astrophysics
147
Hydrocyanic Acid, Interstellar Matter, Isomers, Molecular Clouds, Abundance, Astronomical Spectroscopy, Emission Spectra, Interferometry, Interstellar Chemistry, Orion Constellation, Vibrational Spectra
Scientific paper
Observations of HCN, HNC, and DCN in the OMC-1 region were carried out using the IRAM 30-m dish with 25-arcsec angular resolution. In addition, data were obtained towards Orion-KL in the HC(N-15)(1-0) transition, using the IRAM Plateau de Bure Interferometer. It was found that the HCN/HNC abundance ratio is very high (about 80) in the immediate vicinity of Orion-KL, but it declines rapidly in adjacent ridge positions to values of about 5. The DCN/HCN abundance ratio increases from 0.001 in the hot core gas close to the infrared source IRc2, to values in the range 0.01-0.06 in the OMC-1 region. The H(C-13)N/HC(N-15) ratio increases from 5-7 over much of the ridge to roughly 15 close to Orion-IRc2. A comparison of the observations with the predictions of the molecular cloud chemistry yielded reasonable agreement with steady state models.
Flower David R.
Guilloteau Stéphane
Pineau des Forêts Guillaume
Roueff Evelyne
Schilke Peter
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