Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992icar..100..187j&link_type=abstract
Icarus (ISSN 0019-1035), vol. 100, no. 1, p. 187-196.
Astronomy and Astrophysics
Astronomy
16
Comets, Continuous Spectra, Infrared Astronomy, Submillimeter Waves, Austin Comet, Brorsen-Metcalf Comet, Cometary Atmospheres, Halley'S Comet, Iras-Araki-Alcock Comet, Okazaki-Levy-Rudenko Comet, Thermal Emission
Scientific paper
An initial submillimeter survey with the James Clerk Maxwell Telescope (JCMT) of five near-earth comets is described. The results demonstrate that a significant fraction of near-earth comets emit submillimeter radiation at the 10-100 mJy level and so are within the reach of existing submillimeter telescopes. Five comets have been observed at 0.8 mm and 1.1 mm wavelengths with the JCMT. One periodic and one dynamically new comet were detected. The long-wavelength continuum is tentatively attributed to thermal emission from porous, possibly fractal particles in the coma. The continuum flux densities are larger than can be produced by free-free radiation from cometary plasma. A significant fraction of the emission from Comets IRAS-Araki-Alcock and Okazaki-Levy-Rudenko may emanate from the nucleus.
Jewitt David
Luu Jane
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