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The complex X-ray morphology of the 300 kpc long X-ray jet in PKS1127-145(z=1.18 quasar) is clearly discerned in a ~100 ksec Chandra observation. Thejet X-ray surface brightness gradually decreases by an order of magnitude goingout from the core. The X-ray spectrum of the inner jet is relatively flat withalpha_X=0.66+/-0.15 and steep in the outer jet with alpha_X=1.0+/-0.2. TheX-ray and radio jet intensity profiles are strikingly different, with the radioemission peaking strongly at the two outer knots while the X-ray emission isstrongest in the inner jet region. We discuss the constraints implied by thesedata on the X-ray emission models and conclude that ``one-zone'' models failand that at least a two-component model is needed to explain the jet'sbroadband emission. We propose that the X-ray emission originates in the jetproper while the bulk of the radio emission comes from a surrounding jetsheath. We also consider intermittent jet activity as a possible cause of theobserved jet morphology.

The Case of the 300 kpc Long X-ray Jet in PKS 1127-145 at z=1.18