From Radio to TeV: The surprising Spectral Energy Distribution of AP Librae

Abstract

Following the discovery of high-energy (HE; $E>10\mathrm{MeV}$) and very-high-energy (VHE; $E>100\mathrm{GeV}$) $\gamma$-ray emission from the low-frequency-peaked BL~Lac (LBL) object AP Librae, its electromagnetic spectrum is studied over 60 octaves in energy. Contemporaneous data in radio, optical and UV together with the $\gamma$-ray data are used to construct the most precise spectral energy distribution of this source. The data have been found to be modeled with difficulties with single zone homogeneous leptonic synchrotron self-Compton (SSC) radiative scenarios due to the unprecedented width of the high-energy component when compared to the lower-energy component. The two other LBL objects also detected at VHE appear to have similar modeling difficulties. Nevertheless, VHE $\gamma$ rays produced in the extended jet could account for the VHE flux observed by H.E.S.S.

13 pages 5 figures, accepted by MNRAS Accepted 2015 September 14. Received 2015 September 1; in original form 2015 June 2

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• Constraints on Proton Synchrotron Origin of Very High Energy Gamma Rays from the Extended Jet of AP Librae
• Megaparsec-scale Radio Structure Associated with a Hybrid Blazar SBS B1646+499: Episodic Jet Activity with Precessing Axis
• Multi-wavelength study of OT 081: broadband modelling of a transitional blazar
• The First VHE Activity of OJ 287 and the Extragalactic Background Light