A4 Refereed article in a conference publication
OJ287 taken to pieces: The origin of a precessing and rotating jet
Authors: S. Britzen, C. Fendt, G. Witzel, S-J Qian, I.N. Pashchenko, O.Kurtanidze, M. Zajacek, G. Martinez, V. Karas, M. Aller, H. Aller, A. Eckart, K. Nilsson, P. Ar´evalo, J. Cuadra, A.
Witzel
Editors: Piero Nicolini, Matthias Kaminski, Jonas Mureika, Marcus Bleicher
Conference name: Karl Schwarzschild Meeting
Publisher: Institute of Physics Publishing
Publication year: 2018
Journal: Journal of Physics: Conference Series
Book title : 3rd Karl Schwarzschild Meeting - Gravity and the Gauge/Gravity Correspondence
Journal name in source: Journal of Physics: Conference Series
Article number: 012005
Number in series: 1
Volume: 942
Issue: 1
ISSN: 1742-6588
eISSN: 1742-6596
DOI: https://doi.org/10.1088/1742-6596/942/1/012005
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/30311775
OJ287 is the best candidate active galactic nucleus for hosting a
supermassive binary black hole at very close separation, corresponding
to the orbital period of the order of ~9 yr. We studied the pc-scale jet
dynamics in 118 Very Long Baseline Array (VLBA) observations at 15 GHz
covering the time between Apr. 1995 and Jan. 2017. To our knowledge,
this is the first time, that the kinematics of the Blandford-Znajek jet
(originating in the ergosphere of a rotating black hole) and jet sheath
(originating from the accretion disk) are seen and traced in
observations. We also find that the OJ287 radio jet is rotating and
precessing. The jet dynamics as well as the flux-density light curves
can be understood in terms of geometrical effects. A binary black hole
model can explain the time scale of the precessing motion.
Lense-Thirring precession of an accretion disc surrounding a single
black hole is consistent with the time scale as well.
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