Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 726, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/726/1/L13
Keywords
BL Lacertae objects: individual (OJ287); galaxies: active; galaxies: jets; gamma rays: general; polarization; radio continuum: galaxies
Categories
Funding
- NASA [NNX08AJ64G, NNX08AU02G, NNX08AV61G, NNX08AV65G, NNX08AW56S, NNX09AU10G]
- NSF [AST-0907893]
- Boston University [GSSP07-0009]
- St. Petersburg State University [09-02-00092]
- MICIIN [AYA2007-67627-C03-03, AYA2010-14844]
- CEIC [P09-FQM-4784]
- Academy of Finland (Metsahovi)
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We combine time-dependent multi-waveband flux and linear polarization observations with submilliarc-second-scale polarimetric images at gimel = 7 mm of the BL Lacertae type blazar OJ287 to locate the gamma-ray emission in prominent flares in the jet of the source > 14 pc from the central engine. We demonstrate a highly significant correlation between the strongest gamma-ray and millimeter-wave flares through Monte Carlo simulations. The two reported gamma-ray peaks occurred near the beginning of two major millimeter-wave outbursts, each of which is associated with a linear polarization maximum at millimeter wavelengths. Our very long baseline array observations indicate that the two millimeter-wave flares originated in the second of two features in the jet that are separated by > 14 pc. The simultaneity of the peak of the higher-amplitude gamma-ray flare and the maximum in polarization of the second jet feature implies that the gamma-ray and millimeter-wave flares are cospatial and occur > 14 pc from the central engine. We also associate two optical flares, accompanied by sharp polarization peaks, with the two. -ray events. The multi-waveband behavior is most easily explained if the gamma-rays arise from synchrotron self-Compton scattering of optical photons from the flares. We propose that flares are triggered by interaction of moving plasma blobs with a standing shock. The gamma-ray and optical emission is quenched by inverse Compton losses as synchrotron photons from the newly shocked plasma cross the emission region. The millimeter-wave polarization is high at the onset of a flare, but decreases as the electrons emitting at these wavelengths penetrate less polarized regions.
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