High accuracy imaging polarimetry

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dc.contributor.author Batcheldor, D
dc.contributor.author Schneider, G.
dc.contributor.author Hinees, D. C.
dc.contributor.author Axon, D.J.
dc.contributor.author Robinsonson, A.
dc.contributor.author Tadhunter, C.
dc.date.accessioned 2009-05-22T15:24:54Z
dc.date.available 2009-05-22T15:24:54Z
dc.date.issued 2009
dc.identifier.citation Astronomical Society of the Pacific. 121:153-166, 2009 February en_US
dc.identifier.uri http://hdl.handle.net/1850/9668
dc.description.abstract The findings of a nine-orbit calibration plan carried out during HST Cycle 15, to fully determine the NICMOS camera 2 (2.0 !m) polarization calibration to high accuracy, are reported. Recently Ueta et al. and Batcheldor et al. have suggested that NICMOS possesses a residual instrumental polarization at a level of 1.2%–1.5%. This would completely inhibit the data reduction in a number of GO programs, and hamper the ability of the instrument to perform high-accuracy polarimetry. We obtained polarimetric calibration observations of three polarimetric standards at three spacecraft roll angles separated by !60°. Combined with archival data, these observations were used to characterize the residual instrumental polarization in order for NICMOS to reach its full potential of accurate imaging polarimetry at p " 1%. Using these data, we place an 0.6% upper limit on the instrumental polarization and calculate values of the parallel transmission coefficients that reproduce the ground-based results for the polarimetric standards. The uncertainties associated with the parallel transmission coefficients, a result of the photometric repeatability of the observations, are seen to dominate the accuracy of p and ". However, the updated coefficients do allow imaging polarimetry of targets with p " 1:0% at an accuracy of !0:6% and !15°. This work enables a new caliber of science with HST. en_US
dc.language.iso en_US en_US
dc.publisher Public of the Astronomical Society of the Pacific en_US
dc.relation.ispartofseries Vol. 121 en_US
dc.title High accuracy imaging polarimetry en_US
dc.type Article en_US

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