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Over its 13 years of operation (1990 -- 2002), the Faint Object Camera (FOC)on board the Hubble Space Telescope (HST) observed 26 individual activegalactic nuclei (AGNs) in ultraviolet (UV) imaging polarimetry. However, notall of the observations have been reduced and analyzed or set within astandardized framework. We plan to reduce and analyze the AGN observations thathave been neglected in the FOC archives using a consistent, novel, andopen-access reduction pipeline of our own. We then extend the method to thefull AGN sample, thus leading to potential discoveries in the near future. Wedeveloped a new pipeline in Python that will be able to reduce all the FOCobservations in imaging polarimetry in a homogeneous way. Most of thepreviously published reduced observations are dispersed throughout theliterature, with the range of different analyses and approaches making itdifficult to fully interpret the FOC AGN sample. By standardizing the method,we have enabled a coherent comparison among the different observational sets.In this first paper of a series exploring the full HST/FOC AGN sample, wepresent an exhaustively detailed account of how to properly reduce theobservational data. Current progress in data-analysis is implemented in and hasprovided state-of-the-art UV polarimetric maps. We compare our new maps to thebenchmark AGN case of NGC~1068 and successfully reproduce the main resultspreviously published, while pushing the polarimetric exploration of this AGNfuther, thanks to a finer resolution and a higher signal-to-noise ratio (S/N)than previously reported. We also present, for the first time, an opticalpolarimetric map of the radio-loud AGN IC~5063 and we examine the complexinteractions between the AGN outflows and the surrounding interstellar medium(ISM).

astronomy and astrophysics

Forgotten treasures in the HST/FOC UV imaging polarimetric archives of  active galactic nuclei. I. Pipeline and benchmarking against NGC~1068 and  exploring IC~5063