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We present the first X-ray detection of the very young pulsar PSR J1357-6429(characteristic age of 7.3 kyr) using data from the XMM-Newton and Chandrasatellites. We find that the spectrum is well described by a power-law plusblackbody model, with photon index Gamma=1.4 and blackbody temperature kT=160eV. For the estimated distance of 2.5 kpc, this corresponds to a 2-10 keVluminosity of about 1.2E+32 erg/s, thus the fraction of the spin-down energychanneled by PSR J1357-6429 into X-ray emission is one of the lowest observed.The Chandra data confirm the positional coincidence with the radio pulsar andallow to set an upper limit of 3E+31 erg/s on the 2-10 keV luminosity of acompact pulsar wind nebula. We do not detect any pulsed emission from thesource and determine an upper limit of 30% for the modulation amplitude of theX-ray emission at the radio frequency of the pulsar.

Discovery of X-ray emission from the young radio pulsar PSR J1357-6429