Heidelberg 2022 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 11: Astroparticles: From the source to the detector (joint session EP/T)

EP 11.6: Vortrag

Donnerstag, 24. März 2022, 17:30–17:45, EP-H1

Comparison of Models for Predicting Periodic Gamma-Ray & Neutrino Emissions From Blazars — •Armin Ghorbanietemad, Ilja Jaroschewski, and Julia Becker Tjus — Theoretische Physik IV, Ruhr-Unviersität Bochum

There are several indications that electromagnetic emissions from blazars have quasi-periodic variability, ranging from minutes to years. The long-term periodicity in the span of years is particularly evident in gamma-ray observations with the Fermi LAT instrument. Two separate high probability associations of neutrinos, detected by IceCube in 2014/15 and 2017, to the blazar TXS0506+056 further indicate that blazars are neutrino emitters. These two flares can be interpreted as a possible periodicity. It is the aim of this work to develop a general set of models that can explain the periodic gamma-ray and neutrino emissions from blazars.

In this talk, we present models with single supermassive black holes as well as supermassive binary black hole mergers at the centers of blazers. Our focus lies on supermassive binary black hole mergers, due to them radiating gravitational waves which could be detectable by the Laser-interferometer Space Antenna (LISA). The binary systems are characterized by the change of jet direction accompanied by jet precession close to an imminent merger. This allows predictions of possible neutrino and gravitational wave emissions from blazars with quasi-periodic behavior.