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Optical Emission and Particle Acceleration in a Quasi-stationary Component in the Jet of OJ 287

AuthorsSasada, Mahito; Jorstad, Svetlana; Marscher, Alan P.; Bala, Vishal; Joshi, Manasvita; MacDonald, Nicholas R.; Malmrose, Michael P.; Larionov, Valeri M.; Morozova, Daria A.; Troitsky, Ivan S.; Agudo, Iván ; Casadio, Carolina ; Gómez Fernández, J. L. ; Molina, Sol N.; Itoh, Ryosuke
KeywordsBL Lacertae objects: individual (OJ 287)
Galaxies: active
Galaxies: jets
Methods: observational
Techniques: polarimetric
Issue Date2018
PublisherIOP Publishing
CitationAstrophysical Journal 864(1): 67 (2018)
AbstractWe analyze the linear polarization of the relativistic jet in BL Lacertae object OJ 287 as revealed by multi-epoch Very Long Baseline Array images at 43 GHz and monitoring observations at optical bands. The electric-vector position angle 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 ∼0.2 mas (∼0.9 pc projected on the sky) downstream from the core. This implies that electrons with high enough energies to emit optical synchrotron and γ-ray inverse Compton radiation are accelerated both in the core and at the downstream feature, the latter of which lies ≥10 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.© 2018. The American Astronomical Society. All rights reserved..
Publisher version (URL)http://dx.doi.org/10.3847/1538-4357/aad553
Identifiersdoi: 10.3847/1538-4357/aad553
issn: 1538-4357
Appears in Collections:(IAA) Artículos
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