Abstract
The curved shape of the kiloparsec-scale jet of the blazar OJ 287 is analyzed in the framework of the precession of the central engine, on the existence on which a large number of studies over the past decades are based. The data necessary for the analysis on the kiloparsec-scale jet velocity and angle with the line of sight are obtained based on two competing assumptions about the X-ray emission mechanism of the OJ 287 jet. Namely, there were both the inverse Compton scattering of the cosmic microwave background under the assumption of relativistic kiloparsec-scale jet and the inverse Compton scattering of the central source radiation. For the latter one, we showed that the expected flux from the kiloparsec-scale jet in the gamma range does not exceed the limit set for it according to Fermi-LAT data. We found that only the period of the kiloparsec-scale jet helix, estimated in the framework of the inverse Compton scattering of the central source radiation, agrees with the precession period of the central engine, determined from the modulation of the peak values of 12‑year optical flares.
Highlights
The blazar OJ 287 (z = 0.306) is remarkable that there are powerful repeated approximately every 12 years flares in the optical light curve spanning more than 100 years, based on this Sillanpää [1] assumed that there is a binary supermassive black hole (BH) in the center of OJ 287
OJ 287 is the first object for which the existence of a binary black hole system was assumed based on the periodicity of the long-term optical light curve [1]
The variability period can naturally be explained by the jet viewing angle change due to the jet helical shape, which is caused by the central engine precession [3, 4, 10]
Summary
Katz [4] considers a helical jet formed by the precession of the accretion disk of the primary BH caused by the orbital motion of the secondary BH In this framework, the second peak during the 12-year flare is assumed to be formed due to nutation. The collection of observed properties of jets of quasars 3С 273 [28], PKS 1127-145 [29], PKS 0637-752, PKS 1045-188, and PKS 1510-089 [30] was explained in the framework of the model that the X-ray emission is formed due to the inverse Compton scattering of the central source radiation (IC/CS) In this case, under the radiation of the central source (CS), we mean the pc-scale jet radiation relativistically amplified in the reference frame of the kpc-scale jet.
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