The nondetection of continuum radiation from Comet IRAS-Araki-Alcock (1983d) at 2- to 6-cm wavelengths and its implication on the icy-grain halo theory

Details The nondetection of continuum radiation from Comet IRAS-Araki-Alcock (1983d) at 2- to 6-cm wavelengths and its implication on the icy-grain halo theory The nondetection of continuum radiation from Comet IRAS-Araki-Alcock (1983d) at 2- to 6-cm wavelengths and its implication on the icy-grain halo theory

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...62..349d&link_type=abstract

Icarus (ISSN 0019-1035), vol. 62, June 1985, p. 349-359.

Computer Science

11

Centimeter Waves, Continuous Radiation, Iras-Araki-Alcock Comet, Microwave Emission, Comet Nuclei, Glaciers, Grain Size, Halos, Ice, Comets, Iras-Araki-Alcock, Radiation, Wavelengths, Halos, Ice, Grains, Theoretical Studies, Thickness, Size, Comparisons, Centimeter Waves, Thermal Properties, Emissions, Temperature, Depth, Emissivity

Scientific paper

The Comet IRAS-Araki-Alcock was observed with the VLA at 6 and 2 cm, when the comet was at geocentric distances of 0.08 and 0.035 AU, respectively, and the results are discussed. The three sigma upper limits to the flux density are 90 and 750 micro-Jy at the two wavelengths, respectively, values fully two orders of magnitude below the flux densities predicted by the icy-grain halo theory as initially developed. The corrected theory also indicates that the icy grain halo theory does not give an adequate description of the cometary environment. It is shown that the halo is either very optically thin, with a filling factor of the order of 10 to the -5th, or that the maximum size of the grain that can be lifted off the nuclear surface is only of the order of 10-100 microns.

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