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Precessing Jet in the High-Redshift Blazar J0017+8135

Department of Physics of Complex Systems, Eötvös Loránd University, Pázmány P. sétány 1/A, Budapest H-1117, Hungary
FÖMI Satellite Geodetic Observatory, P.O. Box 585, Budapest H-1592, Hungary
Author to whom correspondence should be addressed.
Academic Editors: Jose L. Gómez, Alan P. Marscher and Svetlana G. Jorstad
Galaxies 2016, 4(3), 10;
Received: 12 July 2016 / Revised: 17 August 2016 / Accepted: 18 August 2016 / Published: 24 August 2016
(This article belongs to the Special Issue Blazars through Sharp Multi-wavelength Eyes)
The prominent flat-spectrum radio quasar J0017+8135 (S5 0014+81) at z = 3.366 is one of the most luminous active galactic nuclei (AGN) known. Its milliarcsecond-scale radio jet structure has been studied with very long baseline interferometry (VLBI) since the 1980s. The quasar was selected as one of the original defining objects of the International Celestial Reference Frame, but left out from its current second realization (ICRF2) because of systematic long-term positional variations. Here we analyse archival 8.6- and 2.3-GHz VLBI imaging data collected at nearly 100 different epochs during more than 20 years, to obtain information about the kinematics of jet components. Because of the cosmological time dilation, extensive VLBI monitoring data are essential to reveal changes in the jet structure of high-redshift AGN. In the case of J0017+8135, the data can be described with a simple kinematic model of jet precession with a 12-year periodicity in the observer’s frame. View Full-Text
Keywords: blazars; jets; very long baseline interferometry; precession; high redshift blazars; jets; very long baseline interferometry; precession; high redshift
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Rozgonyi, K.; Frey, S. Precessing Jet in the High-Redshift Blazar J0017+8135. Galaxies 2016, 4, 10.

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