Space VLBI observations of the quasar 1351 - 018: tentative detection of apparent superluminal motion at z = 3.707

Astronomy and Astrophysics – Astronomy

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Scientific paper

Sub-milliarcsecond resolution images of the extremely distant quasar 1351 - 018 (z = 3.707) were made using the VLBI Space Observatory Programme (VSOP) at two epochs. The high angular resolution of VSOP at 5 GHz allowed us to identify a jet component within 1 mas from the quasar radio core. The inner jet position angle is misaligned by 130° with respect to the 10-mas scale jet. The position of the innermost jet component has changed significantly over a period of less than 3 years, implying a proper motion of 0.18 mas/year which corresponds to an apparently superluminal speed. We present our imaging results and discuss the potential importance of the detection of superluminal motion in high redshift quasars.

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