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.
quasars: individual: PMN J2134−0419 – radio continuum: galaxies
galaxies: nuclei
galaxies: active
galaxies: high-redshift
Författare
Krisztina Perger
Magyar Tudomanyos Akademia
Eötvös Loránd University (ELTE)
Sandor Frey
Magyar Tudomanyos Akademia
Krisztina E. Gabanyi
Eötvös Loránd University (ELTE)
Magyar Tudomanyos Akademia
Tao An
Chinese Academy of Sciences
Silke Britzen
Max-Planck-Gesellschaft
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
Chinese Academy of Sciences
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 1065-1070Ämneskategorier (SSIF 2011)
Astronomi, astrofysik och kosmologi
Fundament
Grundläggande vetenskaper
Infrastruktur
Onsala rymdobservatorium
DOI
10.1093/mnras/sty837