Next Article in Journal / Special Issue
Linear Polarization Properties of Parsec-Scale AGN Jets
Previous Article in Journal / Special Issue
Behaviour of the Blazar CTA 102 during Two Giant Outbursts
Open AccessFeature PaperArticle

Multi-Frequency VLBA Polarimetry and the Twin-Jet Quasar 0850+581

Lebedev Physical Institute, Astro Space Center, Profsoyuznaya 84/32, Moscow 117997, Russia
Moscow Institute of Physics and Technology, Institutsky per., 9, Dolgoprudny 141700, Russia
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Author to whom correspondence should be addressed.
This paper is an extended version of our paper published in Polarised Emission from Astrophysical Jets.
Galaxies 2017, 5(4), 92;
Received: 9 October 2017 / Revised: 21 November 2017 / Accepted: 28 November 2017 / Published: 30 November 2017
(This article belongs to the Special Issue Polarised Emission from Astrophysical Jets)
We present the first multi-frequency VLBA study of the quasar 0850+581 which appears to have a two-sided relativistic jet. Apparent velocity in the approaching jet changes from 3.4c to 7c with the separation from the core. The jet-to-counter-jet ratio of about 5 and apparent superluminal velocities suggest that the observing angle of the inner jet is 17 . It is likely that this orientation significantly changes downstream due to an interaction of the jet with the surrounding medium; signs of this are seen in polarization. A dense inhomogeneous Faraday screen is detected in the innermost regions of this quasar. We suggest that there is a presence of ionized gas in its nucleus, which might be responsible for the free-free absorption of the synchrotron emission in the jet and counter-jet at frequencies below 8.4 GHz. The experiment makes use of slowly varying instrumental polarisation factors (polarization leakage or D-terms) in time. We report application of the “D-term connection” technique for the calibration of an absolute orientation of electric vector position angle (EVPA) observed by VLBA at 4.6, 5.0, 8.1, 8.4, 15.4, 22.3, and 43.3 GHz bands during the 2007–2011. View Full-Text
Keywords: active galaxies; quasars; polarization; VLBI active galaxies; quasars; polarization; VLBI
Show Figures

Figure 1

MDPI and ACS Style

Kravchenko, E.; Kovalev, Y.Y. Multi-Frequency VLBA Polarimetry and the Twin-Jet Quasar 0850+581. Galaxies 2017, 5, 92.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map

Back to TopTop