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The Frying Pan (G315.9-0.0) is a radio supernova remnant with a peculiarlinear feature (G315.78-0.23) extending 10' radially outward from the rim ofthe shell. We present radio imaging and polarization observations obtained fromthe Molonglo Observatory Synthesis Telescope and the Australia TelescopeCompact Array, confirming G315.78-0.23 as a bow-shock pulsar wind nebula (PWN)powered by the young pulsar J1437-5959. This is one of the longest pulsar tailsobserved in radio and it has a physical extent over 20 pc. We found a bow-shockstand-off distance of 0.002 pc, smallest among similar systems, suggesting alarge pulsar velocity over 1000 km/s and a high Mach number ~200. The magneticfield geometry inferred from radio polarimetry shows a good alignment with thetail orientation, which could be a result of high flow speed. There are alsohints that the postshock wind has a low magnetization and is dominated byelectrons and positrons in energy. This study shows that PWNe can offer apowerful probe of their local environment, particularly for the case of a bowshock where the parent supernova shell is also detected.

An Extreme Pulsar Tail Protruding from the Frying Pan Supernova Remnant