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A comprehensive study of the nucleus and western hotspot of Pictor A iscarried out using AstroSat observations, 13 years of Fermi, and archival Swiftobservations, along with other published data. We report the first detection ofthe western hotspot of Pictor A in the far-UV band using observations fromAstroSat-UVIT. The broad-band SED of the western hotspot is explained by amultizone emission scenario where X-ray emission is caused by synchrotronemission process in the substructures embedded in the diffuse region, while theemission in radio to optical is caused by synchrotron emission process in thediffuse region. We do not notice any excess in the IR band and an additionalzone (beyond 2-zone) is not required to account for the X-ray emission. Ourbroad-band spectro-temporal study and associated modelling of the core andhotspot of Pictor A suggests that (a) gamma-rays originate in the nuclear jetand not from the hotspot (b) X-ray emission from the core of Pictor A hasnuclear jet-origin instead of previously reported disk-origin.

Multiwavelength study of radio galaxy Pictor A: detection of western hotspot in far-UV and possible origin of high energy emissions