Large-scale HCN hyperfine anomalies

Details Large-scale HCN hyperfine anomalies Large-scale HCN hyperfine anomalies

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...139l..13c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 139, no. 1, Oct. 1984, p. L13-L15.

Astronomy and Astrophysics

Astrophysics

22

Abundance, Astronomical Spectroscopy, Hydrocyanic Acid, Hyperfine Structure, Molecular Clouds, Taurus Constellation, Anomalies, Emission Spectra, Interstellar Chemistry, Radiative Transfer

Scientific paper

The authors report observations of the J=1-0 line of HCN in Heiles Cloud 2 (HCL2). About half a square degree was mapped in the emission of this line. In each observed position the two ratios R02 = I(F=0-1)/I(F=2-1) and R12=I(F=1-1)/I(F=2-1) are far from their LTE values, and they show a complicated spatial distribution. The authors suggest that absorption and diffusion of the radiation emitted from the core in a low density envelope is responsible for the observed behaviour of the HCN emission. There is some evidence that the HCN abundance changes from source to source.

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