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

Abstract

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-calledmore » 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.« less

Authors:
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Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
Fermi LAT Collaboration
OSTI Identifier:
1355741
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Astronomy and Astrophysics
Additional Journal Information:
Journal Volume: 597; Journal ID: ISSN 0004-6361
Publisher:
EDP Sciences
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; BL Lacertae objects: individual: OJ 287; galaxies: active; magnetic fields; techniques: high angular resolution; techniques: interferometric; galaxies: jets

Citation Formats

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., and Zensus, J. A. Location of γ -ray emission and magnetic field strengths in OJ 287. United States: N. p., 2017. Web. doi:10.1051/0004-6361/201526727.
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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. Location of γ -ray emission and magnetic field strengths in OJ 287. United States. https://doi.org/10.1051/0004-6361/201526727
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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., and Zensus, J. A. Fri . "Location of γ -ray emission and magnetic field strengths in OJ 287". United States. https://doi.org/10.1051/0004-6361/201526727. https://www.osti.gov/servlets/purl/1355741.
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@article{osti_1355741,
title = {Location of γ -ray emission and magnetic field strengths in OJ 287},
author = {Hodgson, J. A. and Krichbaum, T. P. and Marscher, A. P. and Jorstad, S. G. and Rani, B. and Marti-Vidal, I. and Bach, U. and Sanchez, S. and Bremer, M. and Lindqvist, M. and Uunila, M. and Kallunki, J. and Vicente, P. and Fuhrmann, L. and Angelakis, E. and Karamanavis, V. and Myserlis, I. and Nestoras, I. and Chidiac, C. and Sievers, A. and Gurwell, M. and Zensus, J. A.},
abstractNote = {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.},
doi = {10.1051/0004-6361/201526727},
journal = {Astronomy and Astrophysics},
number = ,
volume = 597,
place = {United States},
year = {Fri Jan 06 00:00:00 EST 2017},
month = {Fri Jan 06 00:00:00 EST 2017}
}
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https://doi.org/10.1051/0004-6361/201526727
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text, January 2011

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text, January 2011

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text, January 2011

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text, January 2011

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Black hole mass and binary model for BL Lac object OJ 287
text, January 2002

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    • DOI: 10.3847/1538-4357/aa8407

    Exploring the Connection between Parsec-scale Jet Activity and Broadband Outbursts in 3C 279
    journal, May 2018

    Exploring the Variability of the Flat-spectrum Radio Source 1633+382. II. Physical Properties
    journal, June 2018

    • Algaba, Juan-Carlos; Lee, Sang-Sung; Rani, Bindu
    • The Astrophysical Journal, Vol. 859, Issue 2
    • DOI: 10.3847/1538-4357/aac2e7

    Optical Emission and Particle Acceleration in a Quasi-stationary Component in the Jet of OJ 287
    journal, August 2018

    • Sasada, Mahito; Jorstad, Svetlana; Marscher, Alan P.
    • The Astrophysical Journal, Vol. 864, Issue 1
    • DOI: 10.3847/1538-4357/aad553

    Ejection of Double Knots from the Radio Core of PKS 1510–089 during the Strong Gamma-Ray Flares in 2015
    journal, May 2019

    • Park, Jongho; Lee, Sang-Sung; Kim, Jae-Young
    • The Astrophysical Journal, Vol. 877, Issue 2
    • DOI: 10.3847/1538-4357/ab1b27

    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
    journal, June 2019

    • Wehrle, Ann E.; Carini, Michael; Wiita, Paul J.
    • The Astrophysical Journal, Vol. 877, Issue 2
    • DOI: 10.3847/1538-4357/ab1b2d

    Long-term Variability and Correlation Study of the Blazar 3C 454.3 in the Radio, NIR, and Optical Wavebands
    journal, December 2019

    Kinematics of the M87 Jet in the Collimation Zone: Gradual Acceleration and Velocity Stratification
    journal, December 2019

    The Most Compact Bright Radio-loud AGNs. II. VLBA Observations of 10 Sources at 43 and 86 GHz
    journal, January 2018

    • Cheng, X. -P.; An, T.; Hong, X. -Y.
    • The Astrophysical Journal Supplement Series, Vol. 234, Issue 1
    • DOI: 10.3847/1538-4365/aa9e4b

    Interferometric Monitoring of Gamma-ray Bright AGNs: S5 0716+714
    text, January 2017

    Optical Emission and Particle Acceleration in a Quasi-Stationary Component in the Jet of OJ~287
    text, January 2018

    Spatially resolved origin of mm-wave linear polarization in the nuclear region of 3C 84
    text, January 2018

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