A precessing and nutating jet in OJ287

0537382 - ASÚ 2021 GB eng C - Conference Paper (international conference)
Britzen, S. - Fendt, C. - Witzel, G. - Qian, S.J. - Pashchenko, I. N. - Kurtanidze, O.M. - Zajaček, Michal - Martinez, G. - Karas, Vladimír - Aller, M. - Aller, H. - Eckart, A. - Nilsson, K. - Arévalo, P. - Cuadra, J. - Subroweit, M. - Witzel, G.
A precessing and nutating jet in OJ287.
Perseus in Sicily: From Black Hole to Cluster Outskirts. Cambridge: Cambridge University Press, 2020, s. 250-251. Proceedings of the International Astronomical Union, IAU S342. ISBN 9781108471534. ISSN 1743-9213. E-ISSN 1743-9221.
[Symposium of the International Astronomical Union /342./. Noto (IT), 14.05.2018-18.05.2018]
Institutional support: RVO:67985815
Keywords : interferometric techniques * jets * BL Lacertae objects
OECD category: Astronomy (including astrophysics,space science)

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.
Permanent Link: http://hdl.handle.net/11104/0315099