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A precessing and nutating jet in OJ287

Published online by Cambridge University Press:  07 April 2020

Silke Britzen ,
C. Fendt ,
G. Witzel ,
S.-J. Qian ,
I. N. Pashchenko ,
O. Kurtanidze ,
M. Zajacek ,
G. Martinez ,
V. Karas  and
M. Aller
...Show all authors
Silke Britzen
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Huegel 69 53121 Bonn, Germany email: sbritzen@mpifr.de
C. Fendt
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl, Heidelberg, Germany
G. Witzel
Affiliation:
UCLA, Department of Physics and Astronomy, LA, CA ,90095, USA
S.-J. Qian
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Beijing100012, China
I. N. Pashchenko
Affiliation:
Astro Space Center, Lebedev Physical Institute, Russian Academy of Sciences
O. Kurtanidze
Affiliation:
Abastumani Observatory, Mt Kanobili, 0301 Abastumani, Georgia Engelhardt Astronomical Observatory, Kazan Federal University, Tatarstan, Russia
M. Zajacek
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Huegel 69 53121 Bonn, Germany email: sbritzen@mpifr.de Astronomical Institute, Academy of Sciences, Boční II 1401, CZ-14131 Prague, Czech Republic I. Physikalisches Institut der Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
G. Martinez
Affiliation:
UCLA, Department of Physics and Astronomy, LA, CA ,90095, USA
V. Karas
Affiliation:
Astronomical Institute, Academy of Sciences, Boční II 1401, CZ-14131 Prague, Czech Republic
M. Aller
Affiliation:
University of Michigan, Ann Arbor, MI48109, USA
H. Aller
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Huegel 69 53121 Bonn, Germany email: sbritzen@mpifr.de I. Physikalisches Institut der Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
A. Eckart
Affiliation:
Tuorla Observatory, Department of Physics and Astronomy, University of Turku, 20500, Turku, Finland
K. Nilsson
Affiliation:
Tuorla Observatory, Department of Physics and Astronomy, University of Turku, 20500, Turku, Finland
P. Arévalo
Affiliation:
Instituto de Fsica y Astronoma, Facultad de Ciencias, Universidad de Valparaso, Gran Bretaña No. 1111, Playa Ancha, 2360102 Valparaso, Chile
J. Cuadra
Affiliation:
Instituto de Astrofísica, Pontificia Universidad Católica de Chile, 782-0436 Santiago, Chile
M. Subroweit
Affiliation:
I. Physikalisches Institut der Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
A. Witzel
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Huegel 69 53121 Bonn, Germany email: sbritzen@mpifr.de
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Abstract

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We re-analyzed OJ287 in 120 Very Long Baseline Array (VLBA, MOJAVE) observations (at 15 GHz) covering the time span between Apr. 1995 and Apr. 2017. We find that the radio jet motion over the sky is consistent with a precessing and nutating jet source. The variability of the radio flux-density can be explained by Doppler beaming due to a change in the viewing angle. We suggest that part of the optical emission is due to synchrotron emission related to the jet radiation. We find a strikingly similar scaling for the timescales for precession and nutation as indicated for SS433 with a factor of roughly 50 times longer in OJ287.

Keywords

techniques: interferometricgalaxies: jetsBL Lacertae objects: individual (OJ 287)

References

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