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The multi-wavelength photon spectrum from the BL Lac object AP Librae extendsfrom radio to TeV gamma rays. The X-ray to very high energy gamma ray emissionfrom the extended jet of this source has been modeled earlier with inverseCompton (IC) scattering of relativistic electrons off the CMB photons. TheIC/CMB model requires the kpc scale extended jet to be highly collimated withbulk Lorentz factor close to 10. Here we discuss the possibility of protonsynchrotron origin of X-rays and gamma-rays from the extended jet with bulkLorentz factor 3. This scenario requires extreme energy of protons and highmagnetic field 1 mG of the extended jet with very high jet power in particlesand magnetic field (which is more than 100 times the Eddington luminosity of APLibrae) to explain the very high energy gamma ray emission. Moreover, we haveshown that X-ray emission from the extended jets of 3C 273 and PKS 0637-752could be possible by proton synchrotron emission with jet powers comparable totheir Eddington luminosities.

Constraints on Proton Synchrotron Origin of Very High Energy Gamma Rays from the Extended Jet of AP Librae