It is commonly believed that blazar jets are relativistic magnetized plasma outflows from supermassive black holes. One key question is how the jets dissipate magnetic energy to accelerate particles and drive powerful multiwavelength flares. Relativistic magnetic reconnection has been proposed as the primary plasma physical process in the blazar emission region. Recent numerical simulations have shown strong acceleration of nonthermal particles that may lead to multiwavelength flares. Nevertheless, previous works have not directly evaluated
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Abstract γ -ray signatures from first-principles simulations. In this paper, we employ combined particle-in-cell and polarized radiation transfer simulations to study multiwavelength radiation and optical polarization signatures under the leptonic scenario from relativistic magnetic reconnection. We find harder-when-brighter trends in optical and Fermi-LATγ -ray bands as well as closely correlated optical andγ -ray flares. The swings in optical polarization angle are also accompanied byγ -ray flares with trivial time delays. Intriguingly, we find highly variable synchrotron self-Compton signatures due to inhomogeneous particle distributions during plasmoid mergers. This feature may result in fastγ -ray flares or orphanγ -ray flares under the leptonic scenario, complementary to the frequently considered minijet scenario. It may also imply neutrino emission with low secondary synchrotron flux under the hadronic scenario, if plasmoid mergers can accelerate protons to very high energy. -
Acciari, Victor A. ; Ansoldi, Stefano ; Antonelli, Lucio Angelo ; Arbet Engels, Axel ; Artero, Manuel ; Asano, Katsuaki ; Baack, Dominik ; Babic, Ana ; Baquero, Andrés ; Barres de Almeida, Ulisses ; et al ( , Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021))null (Ed.)