Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...297l..11w&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 297, Oct. 1, 1985, p. L11-L15.
Astronomy and Astrophysics
Astronomy
37
Continuous Spectra, Infrared Astronomy, Interstellar Matter, Molecular Clouds, Orion Nebula, Radio Sources (Astronomy), Cosmic Dust, Emission Spectra, Hydrogen Clouds, Interferometry, Millimeter Waves, Optical Thickness, Thermal Emission
Scientific paper
The 3.4 mm radio continuum emission from the Kleinmann-Low nebula (KL) in Orion has been mapped with 3 arcsec angular resolution using the Hat Creek millimeter-interferometer. The continuum emission in this wavelength region is attributable to a blend of spectral lines and to thermal emission from dust. It is found that the integrated flux density from dust emission is not less than 1.2 Jy from the central 30 arcsec of the Orion molecular cloud. This implies that the dust emissivity in this cloud varies approximately as lambda exp -1.3 between 0.4 and 3.4 mm. The continuum emission is strongest approximately 2 arcsec SE of the infrared source IRc2, suggesting that a dense condensation lies along this line of sight. In this direction the dust has an optical depth of 0.01 at 3.4 mm, which implies a hydrogen column density of 10 to the 24th/sq cm and a total mass of 1-3 solar masses for this condensation. This condensation may be responsible for much of the 'hot core' emission seen in NH3 and in other molecular lines.
Vogel Stuart N.
Wright Mel C. H.
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