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   52084
   Common wisdom tells us that there must exist some relativistic outflow
   from the Vela pulsar which would explain its rotational energy loss
   rate. Recent ROSAT and ASCA observations of a jet-like structure near
   the Vela pulsar suggest that the pulsar is driving a jet into its
   supernova remnant. We found a partially thermal spectrum at the head of
   the jet, but the ASCA spectrum of the jet "body" is unknown. If the
   body is purely thermal, then we interpret the jet as a hot plasma
   "cocoon" surrounding the jet itself. If instead the body spectrum is
   purely non-thermal, then it would be similar to another pulsar jet of
   PSR 1509-58, recently discovered by ASCA.
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