Dual-frequency VSOP Imaging of a High-redshift Radio Quasar PKS 1402+044

Details Dual-frequency VSOP Imaging of a High-redshift Radio Quasar PKS 1402+044 Dual-frequency VSOP Imaging of a High-redshift Radio Quasar PKS 1402+044

2006-11-14

arxiv.org/abs/astro-ph/0611425v1

Astronomy and Astrophysics

Astrophysics

3 pages, 2 figures, Proceedings of the 8th European VLBI Network Symposium, Torun, Poland, 26-29 Sep. 2006

Scientific paper

Based on the VLBI Space Observatory Programme (VSOP) observations at 1.6 and 5 GHz, we find that the luminous high-redshift (z=3.215) quasar PKS 1402+044 (J1405+0415) has a pronounced 'core--jet' structure. The jet shows a steeper spectral index and lower brightness temperature with the increase of the distance from the core. The variation of brightness temperature is basically consistent 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 ~10^9 M_sun. The upper limit of the jet proper motion of PKS 1402+044 is 0.03 mas/yr (~3c) in the east-west direction.

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