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Stacking polarized radio emission in SKA surveys provides statisticalinformation on large samples that is not accessible otherwise due tolimitations in sensitivity, source statistics in small fields, and averagingover frequency (including Faraday synthesis). Polarization is a special casebecause one obvious source of stacking targets is the Stokes I source catalog,possibly in combination with external catalogs, for example an SKA HI survey ora non-radio survey. We point out the significance of stacking sub-samplesselected by additional observable parameters to investigate relations thatreveal more about the physics of the source. Applications of stackingpolarization include, but are not limited to, obtaining in a statistical sensepolarization information to the detection limit in total intensity,depolarization as a function of cosmic time at consistent source-framewavelengths, magnetic field properties in objects with a low radio luminositysuch as dwarf and low-surface-brightness galaxies, and investigating potentialcorrelations of observable parameters with the average magnetic field directionin a sample. We also point out the potential use of stacking in validating thepolarization calibration of a survey. While stacking is flexible in terms ofsurvey definition, we discuss optimal survey parameters for the scienceexperiments presented, as well as computing and archiving requirements.

Stacking for Cosmic Magnetism with SKA Surveys