| Abstract: | The Planck satellite provides a set of all-sky maps spanning nine frequencies
from 30 GHz to 857 GHz, with an unprecedented combination of sensitivity and
angular resolution. Planets, minor bodies, and diffuse interplanetary dust
(IPD) contribute to the submillimetre and millimetre sky emission it observed.
The diffuse emission can be effectively separated from Galactic and other
emissions, because Planck views a given point on the distant celestial sphere
multiple times, through different columns of IPD. We use the Planck data to
investigate the behaviour of Zodiacal emission over the whole sky in the
sub-millimetre and millimetre. We fit the COBE Zodiacal model to the Planck
data to find the emissivities of the various components of this model -- a
diffuse cloud, three asteroidal dust bands, a circumsolar ring, and an
Earth-trailing feature. The emissivity of the diffuse Zodiacal cloud decreases
with increasing wavelength, as expected from earlier analyses. The emissivities
of the dust bands, however, decrease less rapidly, indicating that the
properties of the grains in the bands are different than those in the diffuse
cloud. As part of the analysis, we fit the small amount of Galactic emission
seen through the instrument’s far sidelobes and place limits on possible
contamination of the CMB results from both Zodiacal emission and Galactic
emission seen through these far sidelobes. When necessary, these results are
used in the Planck pipeline to make maps with Zodiacal emission and far
sidelobes removed. We show that the spectrum of the Zodiacal correction to the
CMB maps is small compared to the Planck CMB temperature power spectrum. |
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