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: nuclei

galaxies: high-redshift

galaxies: active

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


Krisztina Perger

Sandor Frey

Krisztina E. Gabanyi

Tao An

Shanghai Astronomical Observatory

Silke Britzen

Hong-Min Cao

David Cseh

Jane Dennett-Thorpe

Leonid I. Gurvits

Joint institute for very long baseline interferometry (VLBI) as a European research infrastructure consortium (JIV_ERC

Xiaoyu Hong

Shanghai Astronomical Observatory

Isobel M. Hook

Zsolt Paragi

Joint institute for very long baseline interferometry (VLBI) as a European research infrastructure consortium (JIV_ERC

Richard T. Schilizzi

Jun Yang

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

Yingkang Zhang

Monthly Notices of the Royal Astronomical Society

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

Vol. 477 1065-1070


Astronomi, astrofysik och kosmologi


Grundläggande vetenskaper


Onsala rymdobservatorium



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