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

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

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988stin...8828847s&link_type=abstract

Unknown

Computer Science

Cyano Compounds, Emission Spectra, Line Spectra, Molecular Clouds, Orion Nebula, Brightness Temperature, Gas Density

Scientific paper

An HCN J=9 to 8 (797.433 GHz) emission is reported. 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 30 K in a 32 arcsec beam. The hydrogen density of the gas emitting the plateau component is estimated to be at least a few times 10 to the 7th power cc, probably near 10 to the 8th power cc. The beam dilution correction gives an intrinsic brightness temperature of the plateau HCN J=9 to 8 emission of 170 K. This suggests that the J=9 level is near thermalization and hence that the density is near the critical density of the 9 to 8 transition. The hot core HCN J=9 to 8 emission confirms the interpretation of the hot core feature as emission from clumps of temperature several hundred degrees K with a density near 10 to the 7th power cc or higher. Excitation by IR continuum photons can be ruled out for the observed HCN J=9 to 8 emission.

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