Polarisation Observations with ISOCAM

Details Polarisation Observations with ISOCAM Polarisation Observations with ISOCAM

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.435...41s&link_type=abstract

WORKSHOP ON ISO POLARISATION OBSERVATIONS. Eds. R.J. Laureijs & R. Siebenmorgen. ESA-SP 435, p. 41

Physics

1

Iso, Infrared Polarimetry

Scientific paper

An overview is given of the ISOCAM polarisation capabilities. The different polarisation modes, necessary steps in the data reduction and the calibration strategy are described. Deep raster observations in various optical configurations on the zodiacal light are presented. By assuming that the zodiacal light is unpolarised we derive the instrumental polarisation and find a mean fractional polarisation of p ~ 1.0 +/- 0.3 %. Measurements of unpolarised standard stars have been performed and here we find for the lw2, 3" lens configuration an instrumental polarisation of p = 1.5 +/- 0.3 %, consistent with the zodiacal light observations. With present processing techniques we achieve for moderately bright targets a 1 σ = 0.5 % accuracy limit of linear polarisation.

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