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ACS Polarization Calibration – Data, Throughput, and Multidrizzle Weighting Schemes

A subset of the polarized images from calibration proposals 9586, 9661, and 10055 were analyzed to help determine the polarization calibration accuracy level of the ACS camera. The polarization values found here are shown to be accurate to better than 1%. The absolute throughput values found while performing these calibration exercises did not match those currently listed in the synphot/ETC database, and we recommend these be updated in the system. Lastly, we examine the differences between two weighting schemes used in the multidrizzle software. The exposure time weighting, EXP, is found to more accurately preserve the flux levels than the error weighting scheme, ERR, for datasets with a small number of images being combined. Introduction The ACS camera has a versatile imaging polarization capability. Science programs using the polarizers have included observations ranging from Martian surface properties, to magnetic field structures of synchrotron jets, to observations of light echoes. The polarization levels in some of these objects can be a few percent or less, and a polarization calibration accuracy of ~ 1% is expected from the ACS polarizers (Pavlovsky et al 2006, ACS Data Handbook). This ISR looks at calibration data from three calibration proposals, discusses the throughput values of the polarizers, and describes the differences seen in output data when different weighting schemes are used in the multidrizzle software. The first section of this ISR describes how the polarization calibration data was processed and lists the results of photometry and the calculations performed on a set of