Protonated HCN in molecular clouds

Details Protonated HCN in molecular clouds Protonated HCN in molecular clouds

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...247..487s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 247, no. 2, July 1991, p. 487-496.

Astronomy and Astrophysics

Astrophysics

16

Hydrocyanic Acid, Interstellar Matter, Molecular Clouds, Stellar Spectrophotometry, Abundance, Carbon Monoxide, Hydroxyl Radicals, Molecular Ions

Scientific paper

Observations of protonated HCN, HCNH(+), in a selection of galactic molecular clouds are reported. This species plays a key role in understanding the chemistry of the important high density tracer HCN. HCNH(+) has been detected in the nearby cold dust cloud TMC-1 with a ratio relative to HCN of HCNH(+)/HCN between 0.015 and 0.26 (preferred value 0.03) and tentatively in DR21 (OH) with a ratio of approximately 0.01. This is about 100 times higher than the ratio of protonated carbon monoxide to CO, but comparable to the HCS(+)/CS ratio. Possible explanations of these high abundance ratios are discussed in the light of model calculations.

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