Britzen, S., Fendt, C., Tramacere, A., Pashchenko, I. N., Jaron, F., Panis, R., Petrov, L., Aller, M. F., Aller, H. D., Zajacek, M. and Popovic, L. C. (2021). A ring accelerator? Unusual jet dynamics in the IceCube candidate PKS 1502+106. Mon. Not. Roy. Astron. Soc., 503 (3). S. 3145 - 3179. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

On 2019/07/30.86853 UT, IceCube detected a high-energy astrophysical neutrino candidate. The Flat Spectrum Radio Quasar PKS 1502+106 is located within the 50 per cent uncertainty region of the event. Our analysis of 15 GHz Very Long Baseline Array (VLBA) and astrometric 8 GHz VLBA data, in a time span prior and after the IceCube event, reveals evidence for a radio ring structure that develops with time. Several arc-structures evolve perpendicular to the jet ridge line. We find evidence for precession of a curved jet based on kinematic modelling and a periodicity analysis. An outflowing broad line region (BLR) based on the C IV line emission (Sloan Digital Sky Survey) is found. We attribute the atypical ring to an interaction of the precessing jet with the outflowing material. We discuss our findings in the context of a spine-sheath scenario where the ring reveals the sheath and its interaction with the surroundings (narrow line region, NLR, clouds). We find that the radio emission is correlated with the gamma-ray emission, with radio lagging the gamma-rays. Based on the gamma-ray variability time-scale, we constrain the gamma-ray emission zone to the BLR (30-200 r(g)) and within the jet launching region. We discuss that the outflowing BLR provides the external radiation field for gamma-ray production via external Compton scattering. The neutrino is most likely produced by proton-proton interaction in the blazar zone (beyond the BLR), enabled by episodic encounters of the jet with dense clouds, i.e. some molecular cloud in the NLR.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Britzen, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fendt, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tramacere, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pashchenko, I. N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jaron, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Panis, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Petrov, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Aller, M. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Aller, H. D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zajacek, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Popovic, L. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-602735
DOI: 10.1093/mnras/stab589
Journal or Publication Title: Mon. Not. Roy. Astron. Soc.
Volume: 503
Number: 3
Page Range: S. 3145 - 3179
Date: 2021
Publisher: OXFORD UNIV PRESS
Place of Publication: OXFORD
ISSN: 1365-2966
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
ACTIVE GALACTIC NUCLEI; MAGNETOHYDRODYNAMIC SIMULATIONS; RAY VARIABILITY; BLAZAR; POLARIZATION; PRECESSION; EMISSION; BEHAVIOR; QUASARS; ORIGINMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/60273

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