Is OJ 287 a Single Supermassive Black Hole?

Abstract

Light curves for more than century optical photometric observations of the blazar OJ 287 reveals strong flares with a quasi-period of about 12 years. For a long time, this period has been interpreted by processes in a binary black hole system. We propose an alternative explanation for this period, which is based on Doppler factor periodic variations of the emitting region caused by jet helicity. Using multi-epoch very large baseline interferometry (VLBI) observations carried out in a framework of the MOJAVE (Monitoring Of Jets in Active galactic nuclei with VLBA Experiments) program and other VLBA (Very Long Baseline Array) archival experiments at the observing frequency of 15 GHz, we derived geometrical parameters of the jet helix. To reach an agreement between the VLBI and photometric optical observation data, the jet component motion at a small angle to the radial direction is necessary. Such non-radial motion is observed and, together with the jet helical shape, can be naturally explained by the development of the Kelvin-Helmholtz instability in the parsec-scale outflow. In this case, the true precession of the OJ 287 jet may manifest itself in differences between the peak flux values of the 12-year optical flares. A possibility to create this precession due to Lense-Thirring effect of a single supermassive black hole is also discussed.

arXiv comment21 pages, 12 figures, 3 tables

References in corpus (27)

• Unified Schemes for Radio-Loud Active Galactic Nuclei
• Accretion disc viscosity: how big is alpha?
• Doppler factors, Lorentz factors and viewing angles for quasars, BL Lacertae objects and radio galaxies
• Sub-milliarcsecond Imaging of Quasars and Active Galactic Nuclei. IV. Fine Scale Structure
• Sub-milliarcsecond Imaging of Quasars and AGN
• MOJAVE. XVII. Jet Kinematics and Parent Population Properties of Relativistically Beamed Radio-Loud Blazars
• Jet opening angles and gamma-ray brightness of AGN
• MOJAVE - XIV. Shapes and opening angles of AGN jets
• A VLBA survey of the core shift effect in AGN jets I. Evidence for dominating synchrotron opacity
• The relation between broad lines and gamma--ray luminosities in Fermi blazars
• A transition from parabolic to conical shape as a common effect in nearby AGN jets
• Variability and stability in blazar jets on time scales of years: Optical polarization monitoring of OJ287 in 2005-2009
• Significant core shift variability in parsec-scale jets of active galactic nuclei
• VLBI-Gaia offsets favor parsec-scale jet direction in Active Galactic Nuclei
• Erratic Jet Wobbling in the BL Lacertae Object OJ287 Revealed by Sixteen Years of 7mm VLBA Observations
• Anatomy of helical relativistic jets: The case of S5 0836+710
• Intrinsic $\gamma$-ray luminosity, black hole mass, jet and accretion in Fermi blazars
• Dissecting the AGN disk-jet system with joint VLBI-Gaia analysis
• A helical jet model for OJ287
• Accretion Disk Parameters determined from the great 2015 flare of OJ 287
• Optical polarization properties of AGN with significant VLBI-Gaia offsets
• Reversals in the Direction of Polarization Rotation in OJ 287
• BL Lacertae: X-ray spectral evolution and a black-hole mass estimate
• A geometrical interpretation for the properties of multiband optical variability of the blazar S5 0716+714
• Geometrical and Kinematic Parameters of the Jet of the Blazar S5 0716+71 in a Helical-Jet Model
• Opacity, variability and kinematics of AGN jets
• Periods of the Long-Term Variability of the Blazar 0716+714 and Their Inter-Correlations in a Helical Jet Model

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• Long Term Multi-band Near Infra-Red Variability of the Blazar OJ 287 during 2007--2021
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• Spectral States of OJ 287 blazar from Multi-wavelength Observations with $AstroSat$
• Detecting the periodicity of highly irregularly sampled light-curves with Gaussian processes: the case of SDSSJ025214.67-002813.7
• Clues on the nature of the quasi-periodic optical outbursts of the blazar OJ 287
• Long-term multiband optical variability of S5 0716+714 blazar
• Unveiling the Bent Jet Structure and Polarization of OJ 287 at 1.7 GHz with Space VLBI
• The blazar OJ 287 jet from parsec- to kiloparsec-scales
• Configuration of the global magnetic field in AGN parsec-scale jets
• Very Large Array imaging rules out precessing radio jets in three DES$-$SDSS-selected candidate periodic quasars
• Parsec-scale jet direction evolution in AGNs
• The observed polarization direction depending on geometrical and kinematic parameters of relativistic jets
• Multimessenger Signatures of Tilted, Self-Gravitating, Black Hole Disks
• Probing the innermost regions of AGN jets and their magnetic fields with RadioAstron. V. Space and ground millimeter-VLBI imaging of OJ 287
• Unveiling the Complex Jet Dynamics in the Blazar 2021+317 through Multi-Epoch VLBI Observations