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Optical Emission and Particle Acceleration in a Quasi-Stationary Component in the Jet of OJ~287
- Publication Year :
- 2018
-
Abstract
- We analyze the linear polarization of the relativistic jet in BL Lacertae object OJ~287 as revealed by multi-epoch Very Long Baseline Array (VLBA) images at 43 GHz and monitoring observations at optical bands. The electric-vector position angle (EVPA) of the optical polarization matches that at 43 GHz at locations that are often in the compact millimeter-wave "core" or, at other epochs, coincident with a bright, quasi-stationary emission feature $\sim0.2$~milliarcsec ($\sim$0.9~pc projected on the sky) downstream from the core. This implies that electrons with high enough energies to emit optical synchrotron and $\gamma$-ray inverse Compton radiation are accelerated both in the core and at the downstream feature, the latter of which lies $\geq10$~pc from the central engine. The polarization vector in the stationary feature is nearly parallel to the jet axis, as expected for a conical standing shock capable of accelerating electrons to GeV energies.<br />Comment: 15 pages, 9 figures, accepted for publication in ApJ
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.1807.11145
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.3847/1538-4357/aad553