PSR J0855 - 4644 is an energetic pulsar ( \dot { E } = 1.1 \times 10 ^ { 36 } erg/s , P =65 ms ) discovered near the South-East rim of the supernova remnant ( SNR ) RX J0852.0 - 4622 ( aka Vela Jr ) by the Parkes Multibeam Survey .
The position of the pulsar is in spatial coincidence with an enhancement in X-rays and TeV \gamma -rays , which could represent its pulsar wind nebula ( PWN ) .

We have revealed with an XMM-Newton observation the X-ray counterpart of the pulsar together with a surrounding extended emission thus confirming the suggestion of a PWN .
The comparison of the absorption column density derived in X-rays from the pulsar with ^ { 12 } CO observations ( tracing the dense gas ) is used to derive an upper limit to the distance of the pulsar ( d < 900 pc ) and to discuss a possible association of the pulsar with the Vela Jr SNR .
This new distance estimate implies that the pulsar is nearby and could therefore significantly contribute to the observed spectrum of cosmic-ray leptons ( e ^ { - } /e ^ { + } ) .