Methodologies to Calibrating NICMOS Polarimetry Characteristics

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Hubble Space Telescope, Hst, Space Telescope Science Institute, Nicmos

Scientific paper

Astronomical imaging polarimetry commonly utilizes a sequence of images taken with a polarizing filter oriented at different angles. For example, each of the Faint Object Camera (FOC), Near Infra-Red Camera and Multi Object Spectrometer (NICMOS) and the Advanced Camera for Surveys (ACS) instruments on the Hubble Space Telescope use three separate polarizing spectral elements oriented at approximately 60 degrees to one another to obtain a set of images that may subsequently be processed to derive polarization information on the astronomical object. Here we present the general linear theory of analysis for the case of three non-ideal polarizers. There are several ways to express the calibration of such polarizing elements and a variety of commonly used conventions. We present a summary of three of the more commonly encountered conventions, along with transformations between the different calibration systems. Specific examples are also cited for reference based on the short wavelength NICMOS polarizer characteristics. We present the transformations between three images taken with independent polarizers and the corresponding set of Stokes parameter images.

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