Astronomy and Astrophysics – Astronomy
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...196..277d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 196, no. 1-2, May 1988, p. 277-286.
Astronomy and Astrophysics
Astronomy
28
Infrared Radiation, Interplanetary Dust, Thermal Emission, Zodiacal Dust, Infrared Astronomy Satellite, Spatial Distribution, Zodiacal Light
Scientific paper
IRAS measurements of the thermal emission from the zodiacal cloud have been modelled using a modified fan model to describe the spatial distribution of interplanetary dust. The wavelength dependence of the surface brightness at the ecliptic poles is consistent with a grain emissivity which is constant with wavelength, implying that the grains at 1 AU are 'large' (a=10 microns or greater) with a temperature of 238 K. Values for (i, Omega) of this plane relative to the ecliptic are deduced, based on the annual variation of (1) the brightness of the ecliptic poles, and (2) the ecliptic latitude of the brightness peaks at + or - 90 deg elongation. These two methods yield significantly different values, indicating that the symmetry plane is warped outside 1 AU. The values based on the ecliptic pole variation are least susceptible to this warp. Using these values, a very good fit to representative scans across the zodiacal cloud at constant elongation is obtained at 25 and 60 microns.
Deul Erik R.
Wolstencroft Ramon D.
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