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New class of Very High Energy gamma-ray emitter: radio-dark mini-shells surrounding AGN jets

We explore non-thermal emission from a shocked interstellar medium, which is identified as an expanding shell, driven by a relativistic jet in active galactic nuclei (AGNs). In this work, we particularly focus on parsec-scale size mini-shells surrounding mini radio lobes. From radio to X-ray band, the mini radio lobe emission dominates the faint emission from the mini-shell. On the other hand, we find that inverse-Compton (IC) emission from the shell can overwhelm the associated lobe emission at very high energy (VHE; E>100 GeV) gamma-ray range, because energy densities of synchrotron photons from the lobe and/or soft photons from the AGN nucleus are large and IC scattering effectively works. The predicted IC emission from nearby mini-shells can be detected with the Cherencov Telescope Array (CTA) and they are potentially a new class of VHE gamma-ray emitters.

preprint2013arXivOpen access

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