Azimuthally averaged degree of polarization of the non-thermal emission as a function of radius in M 51, computed from our radio maps at 15″ resolution in rings of 20″ radial width in the plane of the galaxy (with inclination l = −20° and position angle PA = − 10°) out to a maximum radius of 240″ (this refers to the middle of the ring). The error bars are calculated from the rms noise in the maps from which the degrees of polarization are derived.
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