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We have for the first time detected X-ray emission associated with aprotostellar jet, on the jet emanating from the L1551 IRS5 protostar. The IRS5protostar is hidden behind a very large absorbing column density, making thedirect observation of the jet's emission possible. The observed X-ray emissionis likely associated with the shock ``working surface'', i.e. the interfacebetween the jet and the circumstellar medium. The X-ray luminosity emanatingfrom the jet is moderate, at $L_{\rm X} \simeq 3 \times 10^{29}$ erg/s, asignificant fraction of the luminosity normally associated with the coronalemission from young stars. The spectrum of the X-ray emission is compatiblewith thermal emission from a hot plasma, with a temperature of $\simeq 0.5$ MK,fully in line with the temperature expected (on the basis of the jet'svelocity) for the shock front produced by the jet hitting the circumstellarmedium.Comment: 7 pages, accepted for publication in Astronomy & Astrophysic

Discovery of X-ray emission from the protostellar jet L1551 IRS5 (HH 154)