Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 10: Gamma astronomy 1

T 10.5: Vortrag

Montag, 4. März 2024, 17:00–17:15, Geb. 30.22: kl. HS A

Multi-Messenger Picture of J1048+7143 Consistent with a Supermassive Black Hole Binary Origin* — •Ilja Jaroschewski^1,2, Emma Kun^1,2,3,4, and Julia Becker Tjus^1,2,5 — ¹Theoretical Physics IV, Plasma Astroparticle Physics, Faculty for Physics and Astronomy, Ruhr University Bochum, 44780 Bochum, Germany — ²Ruhr Astroparticle and Plasma Physics Center (RAPP Center), Germany — ³Astronomical Institute, Faculty for Physics and Astronomy, Ruhr University Bochum, 44780 Bochum, Germany — ⁴3CSFK, MTA Centre of Excellence, Hungary — ⁵Department of Space, Earth and Environment, Chalmers University of Technology, 412 96 Gothenburg, Sweden

Until mid 2022, the Fermi-LAT gamma-ray light curve of the FSRQ J1048+7143 showed three distinct flares, each consisting of two subflares. These flares are accompanied by simultaneous flares in radio wavelengths, without a subflare structure. In a previous work, it was shown that these flares are consistent with a supermassive binary black hole origin and are caused by jet precession due to spin-orbit coupling of the leading jet. The occurrence of the fourth flare in gamma rays was predicted, which is observable in the latest gamma-ray light curve.

In this work, we show how the fourth flare in gamma rays was predicted and how the detection of it tightly constraints the mass ratio of the binary. Such a constraint allows to predict when the binary will merge. In addition, we highlight how jet precession provides an explanation for the subflare structure seen in the gamma-ray light curve. *Supported by DFG (MICRO and SFB 1491)

Keywords: Supermassive Binary Black Holes; Active Galactic Nuclei - Blazars; Gamma rays; Radio waves