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

Abstract

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

9 pages, 7 figures, Accepted in ApJ

References in corpus (9)

• Magnetic acceleration of relativistic AGN jets
• Relativistic Jets in Active Galactic Nuclei und Microquasars
• Linking radio and gamma ray emission in Ap Librae
• The high-energy $\gamma$-ray emission of AP Librae
• The TeV emission of Ap Librae: a hadronic interpretation and prospects for CTA
• Revisiting the EC/CMB model for extragalactic large scale jets
• A Photo-Hadronic Model of the Large Scale Jet of PKS 0637-752
• Possible Proton Synchrotron Origin of X-Ray & Gamma Ray Emission in Large Scale Jet of 3C 273
• Peculiar Radio Structures in the Central Regions of Galaxy Cluster Abell 585