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We investigate the frequency-dependent radio properties of the jet of theluminous high-redshift (z = 3.2) radio quasar PKS 1402+044 (J1405+0415) bymeans of radio interferometric observations. The observational data wereobtained with the VLBI Space Observatory Programme (VSOP) at 1.6 and 5 GHz,supplemented by other multi-frequency observations with the Very Long BaselineArray (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. We find that theluminous high-redshift quasar PKS 1402+044 has a pronounced "core-jet"morphology from the parsec to the kilo-parsec scales. The jet shows a steeperspectral index and lower brightness temperature with increasing distance fromthe jet core. The variation of brightness temperature agrees well with theshock-in-jet model. Assuming that the jet is collimated by the ambient magneticfield, we estimate the mass of the central object as ~10^9 M_sun. The upperlimit of the jet proper motion of PKS 1402+044 is 0.03 mas/yr (~3c) in theeast-west direction.

Multi-frequency investigation of the parsec- and kilo-parsec-scale radio structures in high-redshift quasar PKS 1402+044