Constraining the radio jet proper motion of the high-redshift quasar J2134-0419 at z = 4.3

Krisztina Perger*, Sándor Frey, Krisztina E. Gabányi, Tao An, Silke Britzen, Hong Min Cao, Dávid Cseh, Leonid I. Gurvits, Jun Yang, More Authors

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1065-1070
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Publication statusPublished - 2018


  • Galaxies: Active
  • Galaxies: High-redshift
  • Galaxies: Nuclei
  • Quasars: Individual: PMN J2134-0419
  • Radio continuum: Galaxies


Dive into the research topics of 'Constraining the radio jet proper motion of the high-redshift quasar J2134-0419 at z = 4.3'. Together they form a unique fingerprint.

Cite this