LOCATION OF γ-RAY FLARE EMISSION IN THE JET OF THE BL LACERTAE OBJECT OJ287 MORE THAN 14 pc FROM THE CENTRAL ENGINE

被引：159

作者：

Agudo, Ivan ^{[1
]}

Jorstad, Svetlana G. ^{[1
,2
]}

Marscher, Alan P. ^{[1
]}

Larionov, Valeri M. ^{[2
,3
]}

Gomez, Jose L. ^{[4
]}

Lahteenmaki, Anne ^{[5
]}

Gurwell, Mark ^{[6
]}

Smith, Paul S. ^{[7
]}

Wiesemeyer, Helmut ^{[8
]}

Thum, Clemens ^{[9
]}

Heidt, Jochen ^{[10
]}

Blinov, Dmitriy A. ^{[2
,3
]}

D'Arcangelo, Francesca D. ^{[1
,11
]}

Hagen-Thorn, Vladimir A. ^{[2
,3
]}

Morozova, Daria A. ^{[2
]}

Nieppola, Elina ^{[5
,12
]}

Roca-Sogorb, Mar ^{[4
]}

Schmidt, Gary D. ^{[13
]}

Taylor, Brian ^{[1
,14
]}

Tornikoski, Merja ^{[5
]}

Troitsky, Ivan S. ^{[2
]}

机构：

[1] Boston Univ, Inst Astrophys Res, Boston, MA 02215 USA

[2] St Petersburg State Univ, Astron Inst, St Petersburg 198504, Russia

[3] St Petersburg Branch, Isaac Newton Inst Chile, St Petersburg, Russia

[4] CSIC, Inst Astrofis Andalucia, E-18080 Granada, Spain

[5] Aalto Univ, Metsahovi Radio Observ, FIN-02540 Kylmala, Finland

[6] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[7] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[8] Inst Radio Astron Milimetr, E-18012 Granada, Spain

[9] Inst Radio Astron Millimetr, F-38406 St Martin Dheres, France

[10] Landessternwarte Heidelberg, ZAH, D-69117 Heidelberg, Germany

[11] MIT, Lincoln Lab, Lexington, MA 02421 USA

[12] Univ Turku, Finnish Ctr Astron ESO FINCA, FI-21500 Piikkio, Finland

[13] Natl Sci Fdn, Arlington, VA 22230 USA

[14] Lowell Observ, Flagstaff, AZ 86001 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2011年 / 726卷 / 01期

基金：

芬兰科学院;

关键词：

BL Lacertae objects: individual (OJ287); galaxies: active; galaxies: jets; gamma rays: general; polarization; radio continuum: galaxies; ACTIVE GALACTIC NUCLEI; BASE-LINE ARRAY; EGRET-DETECTED QUASARS; BLAZAR; 3C; 279; POLARIMETRIC OBSERVATIONS; HIGH-FREQUENCIES; BRIGHT BLAZARS; RADIO-SOURCES; TIME-SCALES; INNER JET;

D O I：

10.1088/2041-8205/726/1/L13

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：6

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