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We report the discovery of a synchrotron nebula, G283.1-0.59, associated withPSR J1015-5719. Radio observations using the Molonglo Observatory SynthesisTelescope and the Australia Telescope Compact Array at 36, 16, 6, and 3 cmreveal a complex morphology. The pulsar is embedded in the "head" of the nebulawith fan-shaped diffuse emission. This is connected to a circular bubble of 20"radius and a collimated tail extending over 1'. Polarization measurements showa highly ordered magnetic field in the nebula. It wraps around the edge of thehead and shows an azimuthal configuration near the pulsar, then switchesdirection quasi-periodically near the bubble and in the tail. Together with theflat radio spectrum observed, we suggest that this system is most plausibly apulsar wind nebula (PWN), with the head as a bow shock that has a low Machnumber and the bubble as a shell expanding in a dense environment. The bubblecould act as a magnetic bottle trapping the relativistic particles. Acomparison with other bow-shock PWNe with higher Mach numbers shows similarstructure and B-field geometry, implying that pulsar velocity may not be themost critical factor in determining the properties of these systems.  We also derive analytic expressions for the projected standoff distance andshape of an inclined bow shock. It is found that the projected distance isalways larger than the true distance in three dimensions. On the other hand,the projected shape is not sensitive to the inclination after rescaling withthe projected standoff distance.

Discovery of a Synchrotron Bubble Associated with PSR J1015-5719