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Pulsars traveling at supersonic speeds are often accompanied by cometary bowshocks seen in Halpha. We report on the first detection of a pulsar bow shockin the far-ultraviolet (FUV). We detected it in FUV images of the nearestmillisecond pulsar J0437-4715 obtained with the Hubble Space Telescope. Theimages reveal a bow-like structure positionally coincident with part of thepreviously detected Halpha bow shock, with an apex at 10" ahead of the movingpulsar. Its FUV luminosity, L(1250-2000 A) ~ 5x10^28 erg/s, exceeds the Halphaluminosity from the same area by a factor of 10. The FUV emission could beproduced by the shocked ISM matter or, less likely, by relativistic pulsar windelectrons confined by strong magnetic field fluctuations in the bow shock. Inaddition, in the FUV images we found a puzzling extended (~3" in size)structure overlapping with the limb of the bow shock. If related to the bowshock, it could be produced by an inhomogeneity in the ambient medium or aninstability in the bow shock. We also report on a previously undetected X-rayemission extending for about 5" ahead of the pulsar, possibly a pulsar windnebula created by shocked pulsar wind, with a luminosity L(0.5-8 keV) ~ 3x10^28erg/s.

First Detection of a Pulsar Bow Shock Nebula in Far-UV: PSR J0437-4715