Precession-induced Variability in AGN Jets and OJ 287

Abstract

The combined study of the flaring of Active Galactic Nuclei (AGN) at radio wavelengths and pc-scale jet kinematics with Very Long Baseline Interferometry (VLBI) has led to the view that i) the observed flares are associated with ejections of synchrotron blobs from the core, and ii) most of the flaring would follow a one-to-one correlation with the component ejection. Recent results have provided mounting evidence that the quasi-regular component injections into the relativistic jet may not be the only cause of the flux variability. We propose that AGN flux variability and jet morphology changes can both be of deterministic nature, i.e. having a geometric/kinetic origin linked to the time-variable Doppler beaming of the jet emission as its direction changes due to precession (and nutation). The physics of the underlying jet leads to shocks, instabilities, or to ejections of plasmoids. The appearance (morphology, flux, etc.) of the jet can, however, be strongly affected and modulated by precession. We demonstrate this modulating power of precession for OJ 287. For the first time, we show that the spectral state of the Spectral Energy Distribution (SED) can be directly related to the jet's precession phase. We model the SED evolution and reproduce the precession parameters. Further, we apply our precession model to eleven prominent AGN. We show that for OJ 287 precession seems to dominate the long-term variability ($\gtrsim 1\mathrm{yr}$) of the AGN flux, SED spectral state, and jet morphology, while stochastic processes affect the variability on short timescales ($\lesssim 0.2\mathrm{yr}$).

48 pages, 26 figures, 14 tables; published in the Astrophysical Journal

References in corpus (33)

• Doppler factors, Lorentz factors and viewing angles for quasars, BL Lacertae objects and radio galaxies
• Kinematics of Parsec-Scale Jets of Gamma-Ray Blazars at 43~GHz within the VLBA-BU-BLAZAR Program
• MOJAVE: XV. VLBA 15 GHz Total Intensity and Polarization Maps of 437 Parsec-Scale AGN Jets From 1996-2017
• Alignment of Magnetized Accretion Disks and Relativistic Jets with Spinning Black Holes
• Galactic Centre stellar winds and Sgr A* accretion
• Dynamics and High Energy Emission of the Flaring HST-1 Knot in the M 87 Jet
• A rapidly-changing jet orientation in the stellar-mass black hole V404 Cygni
• Plasmoid Instability in Forming Current Sheets
• Autoregressive Times Series Methods for Time Domain Astronomy
• A Multi-epoch VLBI Survey of the Kinematics of Caltech-Jodrell Bank Flat-Spectrum Sources, Part II: Analysis of the Kinematics
• An upper limit on the spin of SgrA${}^{\ast }$ based on stellar orbits in its vicinity
• Structure and flux variability in the VLBI jet of BL Lacertae during the WEBT campaigns (1995--2004)
• Jet precession driven by a supermassive black hole binary system in the BL Lac object PG 1553+113
• Tilted Disks around Black Holes: A Numerical Parameter Survey for Spin and Inclination Angle
• Is the Bardeen-Petterson effect responsible for the warping and precession in NGC 4258?
• Multi-wavelength temporal and spectral variability of the blazar OJ 287 during and after the December 2015 flare: a major accretion disc contribution
• Black hole triggered star formation in the dwarf galaxy Henize 2-10
• agnpy: An open-source python package modelling the radiative processes of jetted active galactic nuclei
• A Possible Periodicity in the Radio Lightcurves of 3C454.3
• Bright X-ray flares from Sgr A*
• Absence of the predicted 2022 October outburst of OJ 287 and implications for binary SMBH scenarios
• AutoRegressive Planet Search: Application to the Kepler Mission
• A ring accelerator? Unusual jet dynamics in the IceCube candidate PKS 1502+106
• Evidence for a jet and outflow from Sgr A*: a continuum and spectral line study
• Strong Soft X-ray Excess in 2015 XMM-Newton Observation of BL--Lac OJ~287
• Radio jet precession in M81*
• Bulk Motion of Ultrarelativistic Conical Blazar Jets
• A Multi-wavelength View of OJ 287 Activity in 2015-2017: Implications of Spectral Changes on Central-engine Models and MeV-GeV Emission Mechanism
• Influence of the jet opening angle on the derived kinematical parameters of blazar jets having uniform and stratified bulk motion
• Revisiting LS I +61 303 with VLBI astrometry
• Deterministic Aspect of the $\gamma$-ray Variability in Blazars
• The physics of the MHD disk-jet transition in binary systems: jetted spiral walls launched from disk spiral arms
• Black-hole activity feedback across vast scales

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