Constraining the radio jet proper motion of the high-redshift quasar J2134− 0419 at z= 4.3
Journal article, 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
quasars: individual: PMN J2134−0419 – radio continuum: galaxies
galaxies: active
Author
Krisztina Perger
Hungarian Academy of Sciences
Eötvös Loránd University (ELTE)
Sandor Frey
Hungarian Academy of Sciences
Krisztina E. Gabanyi
Hungarian Academy of Sciences
Eötvös Loránd University (ELTE)
Tao An
Shanghai Astronomical Observatory
Silke Britzen
Max-Planck Institute for Radio Astronomy
Hong-Min Cao
Shangqiu Normal University
David Cseh
Hungarian Academy of Sciences
Jane Dennett-Thorpe
University of Manchester
Leonid I. Gurvits
Delft University of Technology
Joint Institute for VLBI in Europe (JIVE)
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, Space, Earth and Environment, Onsala Space Observatory
Yingkang Zhang
Chinese Academy of Sciences
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 477 1 1065-1070Subject Categories
Astronomy, Astrophysics and Cosmology
Roots
Basic sciences
Infrastructure
Onsala Space Observatory
DOI
10.1093/mnras/sty837