Location of γ -ray emission and magnetic field strengths in OJ 287

Hodgson, J. A.; Krichbaum, T. P.; Marscher, A. P.; Jorstad, S. G.; Rani, B.; Marti-Vidal, I.; Bach, U.; Sanchez, S.; Bremer, M.; Lindqvist, M.; Uunila, M.; Kallunki, J.; Vicente, P.; Fuhrmann, L.; Angelakis, E.; Karamanavis, V.; Myserlis, I.; Nestoras, I.; Chidiac, C.; Sievers, A.; Gurwell, M.; Zensus, J. A.

doi:10.1051/0004-6361/201526727

Title: Location of γ -ray emission and magnetic field strengths in OJ 287

Journal Article · Fri Jan 06 00:00:00 EST 2017 · Astronomy and Astrophysics

DOI:https://doi.org/10.1051/0004-6361/201526727· OSTI ID:1355741

Hodgson, J. A.; Krichbaum, T. P.; Marscher, A. P.; Jorstad, S. G.; Rani, B.; Marti-Vidal, I.; Bach, U.; Sanchez, S.; Bremer, M.; Lindqvist, M.; Uunila, M.; Kallunki, J.; Vicente, P.; Fuhrmann, L.; Angelakis, E.; Karamanavis, V.; Myserlis, I.; Nestoras, I.; Chidiac, C.; Sievers, A. more »

We report the γ-ray BL Lac object OJ 287 is known to exhibit inner-parsec “jet-wobbling”, high degrees of variability at all wavelengths and quasi-stationary features, including an apparent (≈100°) position-angle change in projection on the sky plane. Sub-50 micro-arcsecond resolution 86 GHz observations with the global mm-VLBI array (GMVA) supplement ongoing multi-frequency VLBI blazar monitoring at lower frequencies. Using these maps, together with cm/mm total intensity and γ-ray observations from Fermi-LAT from 2008-2014, we aim to Observations with the GMVA offer approximately double the angular resolution compared with 43 GHz VLBA observations and enable us to observe above the synchrotron self-absorption peak frequency. Fermi-LAT γ-ray data were reduced and analysed. The jet was spectrally decomposed at multiple locations along the jet. From this, we could derive estimates of the magnetic field using equipartition and synchrotron self-absorption arguments. How the field decreases down the jet provided an estimate of the distance to the jet apex and an estimate of the magnetic field strength at the jet apex and in the broad line region. Combined with accurate kinematics, we attempt to locate the site of γ-ray activity, radio flares, and spectral changes. Strong γ-ray flares appeared to originate from either the so-called core region, a downstream stationary feature, or both, with γ-ray activity significantly correlated with radio flaring in the downstream quasi-stationary feature. Magnetic field estimates were determined at multiple locations along the jet, with the magnetic field found to be ≥1.6 G in the core and ≤0.4 G in the downstream quasi-stationary feature. Finally, we therefore found upper limits on the location of the VLBI core as ≲6.0 pc from the jet apex and determined an upper limit on the magnetic field near the jet base of the order of thousands of Gauss.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: Fermi LAT Collaboration

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1355741

Journal Information:: Astronomy and Astrophysics, Vol. 597; ISSN 0004-6361

Publisher:: EDP SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 33 works

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Polarimetric Observations of 15 Active Galactic Nuclei at High Frequencies: Jet Kinematics from Bimonthly Monitoring with the Very Long Baseline Array Jorstad, Svetlana G.; Marscher, Alan P.; Lister, Matthew L. arXiv https://doi.org/10.48550/arxiv.astro-ph/0502501	text	January 2005

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Spatially resolved origin of millimeter-wave linear polarization in the nuclear region of 3C 84 Kim, J. -Y.; Krichbaum, T. P.; Marscher, A. P. Astronomy & Astrophysics, Vol. 622 https://doi.org/10.1051/0004-6361/201832920	journal	February 2019
Temporality and the evolution of GPNs: remaking BHP’s Pilbara iron ore network Barratt, Tom; Ellem, Bradon Regional Studies, Vol. 53, Issue 11 https://doi.org/10.1080/00343404.2019.1590542	journal	April 2019
Multiwavelength temporal and spectral variability of the blazar OJ 287 during and after the 2015 December flare: a major accretion disc contribution Kushwaha, Pankaj; Gupta, Alok C.; Wiita, Paul J. Monthly Notices of the Royal Astronomical Society, Vol. 473, Issue 1 https://doi.org/10.1093/mnras/stx2394	journal	September 2017
KVN observations reveal multiple γ-ray emission regions in 3C 84? Hodgson, Jeffrey A.; Rani, Bindu; Lee, Sang-Sung Monthly Notices of the Royal Astronomical Society, Vol. 475, Issue 1 https://doi.org/10.1093/mnras/stx3041	journal	January 2018
A connection between γ-ray and parsec-scale radio flares in the blazar 3C 273 Lisakov, M. M.; Kovalev, Y. Y.; Savolainen, T. Monthly Notices of the Royal Astronomical Society, Vol. 468, Issue 4 https://doi.org/10.1093/mnras/stx710	journal	March 2017
Strong X-ray flaring activity of the BL Lacertae source OJ 287 in 2016 October–2017 April Kapanadze, B.; Vercellone, S.; Romano, P. Monthly Notices of the Royal Astronomical Society, Vol. 480, Issue 1 https://doi.org/10.1093/mnras/sty1803	journal	July 2018
Exploring the nature of the 2016 γ-ray emission in the blazar 1749+096 Kim, Dae-Won; Trippe, Sascha; Lee, Sang-Sung Monthly Notices of the Royal Astronomical Society, Vol. 480, Issue 2 https://doi.org/10.1093/mnras/sty1993	journal	July 2018
MOBSTER – II. Identification of rotationally variable A stars observed with TESS in sectors 1–4 Sikora, J.; David-Uraz, A.; Chowdhury, S. Monthly Notices of the Royal Astronomical Society, Vol. 487, Issue 4 https://doi.org/10.1093/mnras/stz1581	journal	June 2019
OJ 287 as a Rotating Helix Cohen, Marshall Galaxies, Vol. 5, Issue 1 https://doi.org/10.3390/galaxies5010012	journal	February 2017
Relativistic Jets from AGN Viewed at Highest Angular Resolution Hada, Kazuhiro Galaxies, Vol. 8, Issue 1 https://doi.org/10.3390/galaxies8010001	journal	December 2019
Interferometric Monitoring of Gamma-Ray Bright AGNs: S5 0716+714 Lee, Jee Won; Lee, Sang-Sung; Hodgson, Jeffrey A. The Astrophysical Journal, Vol. 841, Issue 2 https://doi.org/10.3847/1538-4357/aa72f7	journal	May 2017
Kinematics of Parsec-scale Jets of Gamma-Ray Blazars at 43 GHz within the VLBA-BU-BLAZAR Program Jorstad, Svetlana G.; Marscher, Alan P.; Morozova, Daria A. The Astrophysical Journal, Vol. 846, Issue 2 https://doi.org/10.3847/1538-4357/aa8407	journal	September 2017
Exploring the Connection between Parsec-scale Jet Activity and Broadband Outbursts in 3C 279 Rani, B.; Jorstad, S. G.; Marscher, A. P. The Astrophysical Journal, Vol. 858, Issue 2 https://doi.org/10.3847/1538-4357/aab785	journal	May 2018
Exploring the Variability of the Flat-spectrum Radio Source 1633+382. II. Physical Properties Algaba, Juan-Carlos; Lee, Sang-Sung; Rani, Bindu The Astrophysical Journal, Vol. 859, Issue 2 https://doi.org/10.3847/1538-4357/aac2e7	journal	June 2018
Optical Emission and Particle Acceleration in a Quasi-stationary Component in the Jet of OJ 287 Sasada, Mahito; Jorstad, Svetlana; Marscher, Alan P. The Astrophysical Journal, Vol. 864, Issue 1 https://doi.org/10.3847/1538-4357/aad553	journal	August 2018
Ejection of Double Knots from the Radio Core of PKS 1510–089 during the Strong Gamma-Ray Flares in 2015 Park, Jongho; Lee, Sang-Sung; Kim, Jae-Young The Astrophysical Journal, Vol. 877, Issue 2 https://doi.org/10.3847/1538-4357/ab1b27	journal	May 2019
Measuring the Variability in K2 Optical Light Curves of the Binary Black Hole Candidate OJ 287 and Other Fermi Active Galactic Nuclei in 2014–2015 Wehrle, Ann E.; Carini, Michael; Wiita, Paul J. The Astrophysical Journal, Vol. 877, Issue 2 https://doi.org/10.3847/1538-4357/ab1b2d	journal	June 2019
Long-term Variability and Correlation Study of the Blazar 3C 454.3 in the Radio, NIR, and Optical Wavebands Sarkar, A.; Chitnis, V. R.; Gupta, A. C. The Astrophysical Journal, Vol. 887, Issue 2 https://doi.org/10.3847/1538-4357/ab5281	journal	December 2019
Kinematics of the M87 Jet in the Collimation Zone: Gradual Acceleration and Velocity Stratification Park, Jongho; Hada, Kazuhiro; Kino, Motoki The Astrophysical Journal, Vol. 887, Issue 2 https://doi.org/10.3847/1538-4357/ab5584	journal	December 2019
The Most Compact Bright Radio-loud AGNs. II. VLBA Observations of 10 Sources at 43 and 86 GHz Cheng, X. -P.; An, T.; Hong, X. -Y. The Astrophysical Journal Supplement Series, Vol. 234, Issue 1 https://doi.org/10.3847/1538-4365/aa9e4b	journal	January 2018
Interferometric Monitoring of Gamma-ray Bright AGNs: S5 0716+714 Lee, Jee Won; Lee, Sang-Sung; Hodgson, Jeffrey A. arXiv https://doi.org/10.48550/arxiv.1705.06835	text	January 2017
Optical Emission and Particle Acceleration in a Quasi-Stationary Component in the Jet of OJ~287 Sasada, Mahito; Jorstad, Svetlana; Marscher, Alan P. arXiv https://doi.org/10.48550/arxiv.1807.11145	text	January 2018
Spatially resolved origin of mm-wave linear polarization in the nuclear region of 3C 84 Kim, J. -Y.; Krichbaum, T. P.; Marscher, A. P. arXiv https://doi.org/10.48550/arxiv.1811.07815	text	January 2018
Ejection of Double knots from the radio core of PKS 1510--089 during the strong gamma-ray flares in 2015 Park, Jongho; Lee, Sang-Sung; Kim, Jae-Young arXiv https://doi.org/10.48550/arxiv.1904.11118	text	January 2019
MOBSTER - II. Identification of rotationally variable A stars observed with \emph{TESS} in Sectors 1 to 4 Sikora, J.; David-Uraz, A.; Chowdhury, S. arXiv https://doi.org/10.48550/arxiv.1905.08835	text	January 2019
Long term variability and correlation study of the blazar 3C 454.3 in radio, NIR and optical wavebands Sarkar, A.; Chitnis, V. R.; Gupta, A. C. arXiv https://doi.org/10.48550/arxiv.1910.14329	text	January 2019
Kinematics of the M87 jet in the collimation zone: gradual acceleration and velocity stratification Park, Jongho; Hada, Kazuhiro; Kino, Motoki arXiv https://doi.org/10.48550/arxiv.1911.02279	text	January 2019

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79 ASTRONOMY AND ASTROPHYSICS
BL Lacertae objects: individual: OJ 287
galaxies: active
magnetic fields
techniques: high angular resolution
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Title: Location of γ -ray emission and magnetic field strengths in OJ 287

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