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Jupiter can be used to calibrate our data as its surface brightness
temperature is known to be
with an uncertainty of
15%. This gives us a point source calibration. But the best
calibration is obtained on extended sources like the Galactic plane
and the cosmological dipole that both fill the beam, therefore
including possible sidelobes. We obtained at the end a calibration for
each bolometer with an accuracy of 15%. The uncertainty is mainly due
to the residual scan synchronous parasitic signal.
Figure:
Measured beam shapes for the Archeops bolometers.
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Jean-Christophe Hamilton ISN
2001-12-01