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

(2) Joint Institute for VLBI in Europe; (3) Max-Planck-Institut fur Radioastronomie; (4) FOMI Satellite Geodetic Observatory; 5); (5) MTA Research Group for Physical Geodesy; 6); (6) Graduate University of the Chinese Academy of Sciences); Andrei Lobanov (3); Geodynamics; Jun Yang (1

arxiv: astro-ph/0611425 · v1 · submitted 2006-11-14 · 🌌 astro-ph

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

Jun Yang (1 , 6) , Leonid Gurvits (2) , Andrei Lobanov (3) , Sandor Frey (4 , 5) , Xiao-Yu Hong (1) ((1) Shanghai Astronomical Observatory of the Chinese Academy of Sciences , (2) Joint Institute for VLBI in Europe

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(3) Max-Planck-Institut fur Radioastronomie (4) FOMI Satellite Geodetic Observatory (5) MTA Research Group for Physical Geodesy Geodynamics (6) Graduate University of the Chinese Academy of Sciences)

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keywords brightnesshigh-redshiftquasartemperaturevsopambientassumingbasically

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

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