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We present 8.4 GHz VLA A-array and 1.4 GHz VLBA results on the radiocontinuum emission from the highest redshift radio-loud quasar known to date,the $z=6.12$ QSO J1427+3312. The VLA observations show an unresolved steepspectrum source with a flux density of $250 \pm 20$ uJy at 8.4GHz and aspectral index value of $\alpha^{8.4}_{1.4}=-1.1$. The 1.4 GHz VLBA imagesreveal several continuum components with a total flux density of $1.778 \pm0.109$ mJy, which is consistent with the flux density measured with the VLA at1.4 GHz. Each of these components is resolved with sizes of a fewmilliarcseconds, and intrinsic brightness temperatures on the order of $10^7$to $10^8$ K. The physical characteristics as revealed in these observationssuggest that this QSO may be a Compact Symmetric Object, with the two dominantcomponents seen with the VLBA, which are separated by 31 mas (174 pc) and haveintrinsic sizes of ~22-34 pc, being the two radio lobes that are confined bythe dense ISM. If indeed a CSO, then the estimated kinematic age of this radioAGN is only $10^3$ yr.

VLA and VLBA Observations of the Highest Redshift Radio-Loud QSO J1427+3312 at z = 6.12