Relativistic jet motion in the core of the radio-loud quasar J1101+7225

Free access article

Issue		A&A Volume 438, Number 3, August II 2005


Page(s)		785 - 792
Section		Extragalactic astronomy
DOI		http://dx.doi.org/10.1051/0004-6361:20042407

A&A 438, 785-792 (2005)
DOI: 10.1051/0004-6361:20042407

Relativistic jet motion in the core of the radio-loud quasar J1101+7225

J.-U. Pott^{1, 2}, A. Eckart¹, M. Krips^{1, 3}, T.P. Krichbaum⁴, S. Britzen⁴, W. Alef⁴ and J.A. Zensus⁴

¹ I. Physikalisches Institut, University of Cologne, Zülpicher Strasse 77, 50939 Köln, Germany
e-mail: [pott;eckart;krips]@ph1.uni-koeln.de
² European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching b. München, Germany
³ Institut de Radio-Astronomie Millimétrique (IRAM), 300 rue de la piscine, 38406 Saint-Martin-d'Hères, France
⁴ Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
e-mail: [tkrichbaum;sbritzen;walef;azensus]@mpifr-bonn.mpg.de

(Received 22 November 2004 / Accepted 25 February 2005)

Abstract
Multi-epoch GHz Very Long Baseline Interferometry (VLBI) data of the radio-loud quasar J1101+7225 were analyzed to estimate the proper motion of extended optically thin jet components. Two components separated from the core could be mapped at 1.66 GHz, which is consistent with earlier observations. In one case we found evidence of high apparent superluminal motion ( $\beta _{\rm app}=\,22.5\pm4$ ) at large (deprojected) distances to the core $(22\,{\rm mas}\sim 4\,{\rm kpc,\,at\,}z= 1.46 )$ . Typically in other quasars such high separation velocities are only found much closer to the core component. Furthermore the Doppler factor, the magnetic field strength, and the angular size of the optically thick core were derived using published X-ray data. Analysis of 5 GHz VLBI data reveals the existence of further jet components within the central 5 mas. Additionally the data published so far on the GHz-spectrum were discussed at all angular resolutions. J1101+7225 turns out to be a standard quasar for studying different aspects of radio jet kinematics out to kpc-scales.

Key words: galaxies: active -- galaxies: jets -- galaxies: kinematics and dynamics -- quasars: individual: J1101+7225 -- galaxies: nuclei

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