HCN and HNC observations towards dark clouds

Details HCN and HNC observations towards dark clouds HCN and HNC observations towards dark clouds

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...219..293h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 219, no. 1-2, July 1989, p. 293-302. Research supported by the Magnus Ehrnroot

Astronomy and Astrophysics

Astrophysics

23

Dark Matter, Hydrocyanic Acid, Interstellar Matter, Molecular Clouds, Abundance, Astronomical Maps, Nebulae

Scientific paper

The dark clouds L810, L1551 and L1174 have been mapped in the rotational line J = 1 - 0 of HCN. The cloud L1551 was also mapped in HNC (J = 1 - 0) line. Single positions in 20 other dark clouds were also observed in both transitions. The observations suggest that HCN and HNC lines form partly in different regions. The observed HNC/HCN intensity ratios give probably lower limits for the relative abundances of the molecules. With the aid of hyperfine transitions the optical thickness of HCN J = 1 - 0 line was determined in some positions towards L810 and L1551. The derived opacities are moderate. The observed HCN hyperfine ratios can be in most cases explained by scattering in the foreground gas. In L810, however, some underpopulation of the state J = 1 F = 1 of HCN may be present which is consistent with the thermal overlap model.

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