AP Librae: The extended jet as the source of VHE emission?

Michael Zacharias, S. J. Wagner
2016 Proceedings of The 34th International Cosmic Ray Conference — PoS(ICRC2015)   unpublished
The LBL AP Librae is a fascinating blazar, since its spectrum contains several features, which are not easy to explain. First, the H.E.S.S. collaboration had announced the detection of VHE γ-ray emission from AP Librae. This implies an unusually broad inverse Compton component, since the X-rays are also inverse Compton dominated. Coupled with the narrow synchrotron component, the standard one-zone model fails to reproduce the spectrum. Secondly, X-ray emission from the extended jet has been
more » ... cted, which closely follows the radio morphology. Due to the slope of the X-ray spectrum, one can conclude that the X-ray jet emission is of inverse Compton origin. Interestingly, an extrapolation of the Chandra jet spectrum to γ-ray energies intersects the Fermi-LAT spectrum exactly at the point of a strong break in the Fermi spectrum. This implies that the VHE spectrum measured by H.E.S.S. could be due to inverse Compton emission of the jet instead of the core.
doi:10.22323/1.236.0770 fatcat:4vjnu4fzljdnhdamxxwkwvcg5e