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Calibration

Jupiter can be used to calibrate our data as its surface brightness temperature is known to be $170\mathrm{K_{RJ}}$ 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.
\resizebox{\hsize}{!}{\includegraphics{beamsABall.ps}}



Jean-Christophe Hamilton ISN 2001-12-01