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We investigate apparent internal structure of kiloparsec scale jets of AGNsarising from the energy dependent cooling of accelerated electrons and lighttravel time effect for relativistically moving sources. Using a simplecylindrical shell model, we find that the offsets between the peaks of X-ray,optical and radio brightness distributions observed for many cases arebasically explained with this model. Assuming that electrons in the movingshell are instantaneously accelerated, X-rays are emitted for a shorter timescale and observed at the side nearer to the nucleus, while radio emissioncontinues to the far side of the nucleus because of longer cooling time. Theresultant offset turns out to be order of the jet diameter owing to the lighttravel time effect.

A Model for the Offsets between X-ray and Radio Emission from Large Scale AGN Jets