The Astrophysical Journal Letters (Jan 2024)

Follow-up on the Supermassive Black Hole Binary Candidate J1048+7143: Successful Prediction of the Next Gamma-Ray Flare and Refined Binary Parameters in the Framework of the Jet Precession Model

  • Emma Kun,
  • Ilja Jaroschewski,
  • Julia Becker Tjus,
  • Silke Britzen,
  • Sándor Frey,
  • Krisztina Éva Gabányi,
  • Lang Cui,
  • Xin Wang,
  • Yuling Shen

DOI
https://doi.org/10.3847/2041-8213/ad2767
Journal volume & issue
Vol. 963, no. 1
p. L16

Abstract

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Analyzing single-dish and very long baseline interferometry radio, as well as Fermi Large Area Telescope γ -ray observations, we explained the three major flares in the γ -ray light curve of FSRQ J1048+7143 with the spin–orbit precession of the dominant mass black hole in a supermassive black hole binary system. Here, we report on the detection of a fourth γ -ray flare from J1048+7143, appearing in the time interval that was predicted in our previous work. Including this new flare, we constrained the mass ratio into a narrow range of 0.062 < q < 0.088, and consequently we were able to further constrain the parameters of the hypothetical supermassive binary black hole at the heart of J1048+7143. We predict the occurrence of the fifth major γ -ray flare that would appear only if the jet will still lay close to our line of sight. The fourth major γ -ray flare also shows the two-subflare structure, further strengthening our scenario in which the occurrence of the subflares is the signature of the precession of a spine–sheath jet structure that quasiperiodically interacts with a proton target, e.g., clouds in the broad-line region.

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