The binary supermassive black hole conjecture for jetted active galactic nuclei
February 11, 2020
February 14, 2020
Advances in the knowledge of the universal accretion phenomenon and jet physics, are important not only for astrophysics of stellar-size systems in our Galaxy like cataclysmic variable stars and active galactic nuclei (AGNs), but could be able to contribute to some contemporary multi-messenger and astro-particle research topics.
Astrophysical accretion and binary systems are undoubtedly useful, especially in the case of outflows and production of jets, to understand the role of gravitation in producing high-energy, X-ray and gamma-ray, emission, gravitational waves, accelerated very/ultra-high-energy neutrinos and cosmic rays. In particular close and spatially-unresolved gravitationally bound binaries of supermassive black holes (SMBHs) in AGN are expected to induce cyclical modulations and outbursts in the emitted electromagnetic flux and to produce micro/nano-Hz frequency gravitational waves.
The first discovery of a very high energy neutrino from a flaring GeV gamma-ray blazar
and theoretical predictions about the possibility of accreting black holes with gravitationally bound axion-like particle clouds subject to superradiance, are pointing out AGN and blazars as cosmic beacons able to represent also optimal cosmic laboratories for gravitation and high-energy particle physics. In this frame some developments on the last observational results about a famous radio/gamma-loud, jetted, blazar OJ 287, that is expected to harbor a binary SMBH system are here summarized.
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