Issue |
A&A
Volume 489, Number 2, October II 2008
|
|
---|---|---|
Page(s) | 517 - 524 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:200809846 | |
Published online | 23 July 2008 |
Multi-frequency investigation of the parsec- and kilo-parsec-scale radio structures in high-redshift quasar PKS 1402+044
1
Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, 200030 Shanghai, PR China e-mail: junyang@shao.ac.cn
2
Graduate University of the Chinese Academy of Sciences, Beijing, PR China
3
Joint Institute for VLBI in Europe, PO Box 2, 7990 AA Dwingeloo, The Netherlands e-mail: lgurvits@jive.nl
4
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany e-mail: alobanov@mpifr-bonn.mpg.de
5
FÖMI Satellite Geodetic Observatory, PO Box 585, 1592 Budapest, Hungary e-mail: frey@sgo.fomi.hu
6
MTA Research Group for Physical Geodesy and Geodynamics, PO Box 91, 1521 Budapest, Hungary
Received:
26
March
2008
Accepted:
16
June
2008
Aims. We investigate the frequency-dependent radio properties of the jet
of the luminous high-redshift () radio quasar
PKS 1402+044 (J1405+0415) by means of radio interferometric
observations.
Methods. The observational data were obtained with the VLBI Space Observatory Programme (VSOP) at 1.6 and 5 GHz, supplemented by other multi-frequency observations with the Very Long Baseline Array (VLBA; 2.3, 8.4, and 15 GHz) and the Very Large Array (VLA; 1.4, 5, 15, and 43 GHz). The observations span a period of 7 years.
Results. We find that the luminous high-redshift quasar
PKS 1402+044 has a pronounced “core-jet” morphology from the
parsec to the kilo-parsec scales. The jet shows a steeper spectral
index and lower brightness temperature with increasing distance
from the jet core. The variation of brightness temperature agrees
well with the shock-in-jet model. Assuming that the jet is
collimated by the ambient magnetic field, we estimate the mass of
the central object as ~. The upper limit of the
jet proper motion of PKS 1402+044 is 0.03 mas yr-1
(~
) in the east-west direction.
Key words: galaxies: individual: PKS 1402+044 / galaxies: active / galaxies: quasars: general / galaxies: jets / radio continuum: galaxies
© ESO, 2008
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