First detection of HCN J = 9-8 (797 GHz) line emission - Very high densities in the Orion core

Details First detection of HCN J = 9-8 (797 GHz) line emission - Very high densities in the Orion core First detection of HCN J = 9-8 (797 GHz) line emission - Very high densities in the Orion core

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330l.125s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 330, July 15, 1988, p. L125-L129.

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Gas Density, Hydrocyanic Acid, Interstellar Matter, Line Spectra, Orion Nebula, Computational Astrophysics, Infrared Radiation, Molecular Clouds, Radiative Transfer, Star Formation

Scientific paper

The authors report the first astronomical detection of HCN J = 9 → 8 (797.433 GHz) emission. The line emitted from the Orion core shows two velocity components. One closely matches the low-velocity "plateau" component. The second probably originates in the "hot core" near IRc2. Both components have peak main-beam brightness temperatures of about 30K in a 32arcsec beam. The authors estimate the hydrogen density of the gas emitting the HCN line to be at least a few times 107cm-3 and probably near 108cm-3.

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