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We report radio polarization observations of G319.9-0.7 (MSC 319.9-0.7) at 3and 6 cm obtained with the Australia Telescope Compact Array. The source showsa highly elongated morphology with the energetic pulsar J1509-5850 located atthe tip. We found a flat radio spectrum of index \alpha=-0.26 +/- 0.04 and ahigh degree of linear polarization. These results confirm G319.9-0.7 as abow-shock pulsar wind nebula. The polarization maps suggest a helical magneticfield trailing the pulsar, with the symmetry axis parallel to the system'sinferred direction of motion. This is the first time such a field geometry hasbeen seen in a bow-shock nebula, and it may be the result of an alignmentbetween the pulsar spin axis and its space velocity. Compared to otherbow-shock examples, G319.9-0.7 exhibits very different properties in the fieldstructure and surface brightness distribution, illustrating the large diversityof the population.

Radio Polarization Observations of G319.9-0.7: A Bow-shock Nebula with an Azimuthal Magnetic Field Powered by Pulsar J1509-5850