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Few high-redshift, radio-loud quasars are known to date. The extremelyluminous, radio-bright quasar, SDSS J013127.34-032100.1 was recently discoveredat a redshift of $z=5.18$. We observed the source with high resolution verylong baseline interferometry (VLBI) at 1.7 GHz with the European VLBI Network(EVN) and found a single compact radio component. We estimated a lower limit tothe brightness temperature of the detected radio component, T_B~10^{11} K.Additionaly, when compared to archival radio data, the source showedsignificant flux density variation. These two findings are indicative of theblazar nature of the source.

VLBI observation of the newly discovered z=5.18 quasar SDSS J0131-0321