Parsec-scale Jet in the Distant Gigahertz-Peaked Spectrum Quasar PKS 0858-279

Details Parsec-scale Jet in the Distant Gigahertz-Peaked Spectrum Quasar PKS 0858-279 Parsec-scale Jet in the Distant Gigahertz-Peaked Spectrum Quasar PKS 0858-279

2009-01-09

arxiv.org/abs/0901.1187v1

Astronomische Nachrichten, 330 (2009) 141-144

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

4 pages, 4 figures; accepted for publication in the Astronomische Nachrichten

Scientific paper

10.1002/asna.200811141

The high redshift GPS quasar PKS 0858-279 exhibits the following properties which make the source unusual. Our RATAN-600 monitoring of 1-22 GHz spectrum has detected broad-band radio variability with high amplitude and relatively short time scale. In the same time, the milliarcsecond scale structure observed in a snapshot VLBA survey turned out to be very resolved which is not expected from the fast flux density variations. We performed 1.4-22 GHz VLBA observations of this quasar in 2005-2007. It has revealed a core-jet morphology. A high Doppler factor delta is suggested for the jet, its nature is discussed in this report on the basis of the multi-frequency VLBA and RATAN data collected. Synchrotron self-absorption was confirmed to be dominating at low frequencies, the magnetic field strength of the dominating jet feature is estimated of an order of 0.1*delta mG.

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