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We present a detailed study of the X-ray, optical and radio emission from thejet, lobes and core of the quasar PKS 2101-490 as revealed by new Chandra, HSTand ATCA images. We extract the radio to X-ray spectral energy distributionsfrom seven regions of the 13 arcsecond jet, and model the jet X-ray emission interms of Doppler beamed inverse Compton scattering of the cosmic microwavebackground (IC/CMB) for a jet in a state of equipartition between particle andmagnetic field energy densities. This model implies that the jet remains highlyrelativistic hundreds of kpc from the nucleus, with a bulk Lorentz factor Gamma~ 6 and magnetic field of order 30 microGauss. We detect an apparent radiativecooling break in the synchrotron spectrum of one of the jet knots, and are ableto interpret this in terms of a standard one-zone continuous injection model,based on jet parameters derived from the IC/CMB model. However, we noteapparent substructure in the bright optical knot in one of the HST bands. Weconfront the IC/CMB model with independent estimates of the jet power, and findthat the IC/CMB model jet power is consistent with the independent estimates,provided that the minimum electron Lorentz factor gamma_min > 50, and the knotsare significantly longer than the jet width, as implied by de-projection of theobserved knot lengths.

A Multi-Wavelength Study of the Jet, Lobes and Core of the Quasar PKS 2101-490