Constraining the radio jet proper motion of the high-redshift quasar J2134− 0419 at z= 4.3
Artikel i vetenskaplig tidskrift, 2018

To date, PMN J2134–0419 (at a redshift z = 4.33) is the second most distant quasar known with a milliarcsecond-scale morphology permitting direct estimates of the jet proper motion. Based on two-epoch observations, we constrained its radio jet proper motion using the very long baseline interferometry (VLBI) technique. The observations were conducted with the European VLBI Network (EVN) at 5 GHz on 1999 November 26 and 2015 October 6. We imaged the central 10-pc scale radio jet emission and modelled its brightness distribution. By identifying a jet component at both epochs separated by 15.86 yr, a proper motion of μ = 0.035 ± 0.023 mas yr−1 is found. It corresponds to an apparent superluminal speed of βa = 4.1 ± 2.7 c. Relativistic beaming at both epochs suggests that the jet viewing angle with respect to the line of sight is smaller than 20°, with a minimum bulk Lorentz factor Γ = 4.3. The small value of the proper motion is in good agreement with the expectations from the cosmological interpretation of the redshift and the current cosmological model. Additionally we analysed archival Very Large Array observations of J2143−0419 and found indication of a bent jet extending to ∼30 kpc.

galaxies: high-redshift

quasars: individual: PMN J2134−0419 – radio continuum: galaxies

galaxies: active

galaxies: nuclei


Krisztina Perger

Eötvös Loránd University (ELTE)

Magyar Tudomanyos Akademia

Sandor Frey

Magyar Tudomanyos Akademia

Krisztina E. Gabanyi

MTA-ELTE Peptidkemiai Kutatocsoport

Magyar Tudomanyos Akademia

Tao An

Shanghai Astronomical Observatory

Silke Britzen

Max-Planck Institut für Radioastronomie

Hong-Min Cao

Shangqiu Normal University

David Cseh

Magyar Tudomanyos Akademia

Jane Dennett-Thorpe

University of Manchester

Leonid I. Gurvits

Joint Institute for VLBI in Europe (JIVE)

TU Delft

Xiaoyu Hong

Shanghai Astronomical Observatory

Isobel M. Hook

Lancaster University

Zsolt Paragi

Joint Institute for VLBI in Europe (JIVE)

Richard T. Schilizzi

University of Manchester

Jun Yang

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

Yingkang Zhang

Chinese Academy of Sciences

Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 477 1 1065-1070


Astronomi, astrofysik och kosmologi


Grundläggande vetenskaper


Onsala rymdobservatorium



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