Physics – Optics
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998esoc...55...63h&link_type=abstract
NICMOS and the VLT: A New Era of High Resolution Near Infrared Imaging and Spectroscopy, Pula, Sardinia, Italy, June 26-27th 199
Physics
Optics
Scientific paper
The Near Infrared Camera and Multi-Object Spectrometer (NICMOS) contains optics which enable imaging polarimetry at 1 & 2 microns with unprecedented detail. The preflight Thermal Vacuum tests revealed that each polarizer has a unique polarizing efficiency, and that the position angle offsets differ from the nominal positions of 0 deg, 120 deg & 240 deg. Therefore, to properly reduce polarimetry data obtained with NICMOS, a new algorithm different from that needed for an ideal polarizer was developed. I discuss this new algorithm, its successful application to NICMOS observations, and its more general use for data obtained with other instruments. I also present estimates of the NICMOS Instrumental Polarization, and discuss both the sensitivity of the Grisms to polarized light and the accuracy of NICMOS imaging polarimetry for faint and low polarization objects.
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