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Radio observations by ALMA and upper limits on gamma ray flux by Fermi LAThave ruled out inverse Compton scattering of Cosmic Microwave Backgroundradiation by relativistic electrons (IC/CMB) as the origin of X-ray emissionfrom extended jets of six quasars 3C 273, PKS 0637-752, PKS 1136-135, PKS1229-021, PKS 1354+195, and PKS 2209+080. Here we consider two populations ofaccelerated electrons in each knot of the extended jets to explain the radio tooptical and the X-ray emission by synchrotron cooling of relativisticelectrons. In all cases the jet power required is lower than the Eddington'sluminosity and the observed knot emissions are well explained in this scenario.

A Two Population Electron Synchrotron Model For Knots of Extended Jets