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Polarization of radio emission in extragalactic jets at a sub-milliarcsecondangular resolution holds important clues for understanding the structure of themagnetic field in the inner regions of the jets and in close vicinity of thesupermassive black holes in the centers of active galaxies. Space VLBIobservations provide a unique tool for polarimetric imaging at asub-milliarcsecond angular resolution and studying the properties of magneticfield in active galactic nuclei on scales of less than 10^4 gravitationalradii. A space VLBI observation of high-redshift quasar TXS 0642+449 (OH 471),made at a wavelength of 18 cm (frequency of 1.6 GHz) as part of the EarlyScience Programme (ESP) of the RadioAstron} mission, is used here to test thepolarimetric performance of the orbiting Space Radio Telescope (SRT) employedby the mission, to establish a methodology for making full Stokes polarimetrywith space VLBI at 1.6 GHz, and to study the polarized emission in the targetobject on sub-milliarcsecond scales. Polarization leakage of the SRT at 18 cmis found to be within 9 percents in amplitude, demonstrating the feasibility ofhigh fidelity polarization imaging with RadioAstron at this wavelength. Apolarimetric image of 0642+449 with a resolution of 0.8 mas (signifying an ~4times improvement over ground VLBI observations at the same wavelength) isobtained. The image shows a compact core-jet structure with low (~2%)polarization and predominantly transverse magnetic field in the nuclear region.The VLBI data also uncover a complex structure of the nuclear region, with twoprominent features possibly corresponding to the jet base and a strongrecollimation shock. The maximum brightness temperature at the jet base can beas high as 4*10^13 K.

RadioAstron space VLBI imaging of polarized radio emission in the high-redshift quasar 0642+449 at 1.6 GHz