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Paper: Rotation Measures from Two Data Points - the NVSS Rotation Measure Catalogue
Volume: 438, The Dynamic Interstellar Medium: A Celebration of the Canadian Galactic Plane Survey
Page: 296
Authors: Sunstrum, C.; Taylor, A. R.; Stil, J.
Abstract: Polarized emission from a source may undergo Faraday Rotation when passing through a medium with free electrons and a magnetic field. Observationally, we are able to measure the rotation measure (RM) of a source, which allows us to derive information about the strength of the magnetic field and free-electron density. Typically the determination of the rotation measure (RM) of a source requires observing in several separate frequency bands, in order to resolve the nπ ambiguity, as an unknown number of wraps could have occurred between frequency bands. We present an analysis to determine 37,543 RMs from the NRAO VLA Sky Survey (NVSS) using just two frequencies and bandwidth depolarization, and some results from the catalogue of rotation measures. We also perform source matching against optical catalogues in order to analyze the intrinsic properties of polarized sources.
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