Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss.107..223h&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 107, no. 2, Dec. 1984, p. 223-232.
Astronomy and Astrophysics
Astronomy
3
Infrared Astronomy, Interstellar Matter, Zodiacal Dust, Zodiacal Light, Carbonaceous Chondrites, Infrared Absorption, Infrared Astronomy Satellite, Light Scattering, Refractivity
Scientific paper
To explain the scattering of sunlight observed from the F-corona and from the zodiac, the scattering particles must have radii of order 15 microns, and must have an imaginary component of the refractive index that requires the presence of from 5 to 10 percent of free carbon. The particles, therefore, have a composition very like the material of C 1-carbonaceous chondrites and like extraterrestrial particles which have been recovered from the high atmosphere. Such particles absorb sunlight, the absorbed solar energy being reradiated in the infrared with a close approximation to black-body emission, even a far into the infrared as 100 microns, a deduction in good agreement with observations by Hauser et al., (1984) from the IRAS satellite. The IRAS observations at high-ecliptic latitudes require similar particles to be present in large quantity in the interstellar medium, about 10 to the 6th solar masses or more of them. The presence of such a quantity of material with properties very like the material of the C 1-carbonaceous chondrites is a remarkable outcome of the IRAS observations and is likely to have profound implications in many directions.
Hoyle Fiona
Wickramasinghe Chandra N.
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