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WISE J224607.56$-$052634.9 (W2246-0526) is a hyperluminous ($L_{\rmbol}\approx 1.7\times 10^{14}~L_\odot$), dust-obscured and radio-quiet quasarat redshift $z=4.6$. It plays a key role in probing the transition stagebetween dusty starbursts and unobscured quasars in the co-evolution of galaxiesand supermassive black holes (SMBHs). To search for the evidence of the jetactivity launched by the SMBH in W2246-0526, we performed very long baselineinterferometry (VLBI) observations of its radio counterpart with the EuropeanVLBI Network (EVN) plus the enhanced Multi Element Remotely LinkedInterferometer Network (e-MERLIN) at 1.66 GHz and the Very Long Baseline Array(VLBA) at 1.44 and 1.66 GHz. The deep EVN plus e-MERLIN observations detect acompact (size $\leq32$ pc) sub-mJy component contributing about ten percent ofits total flux density, which spatially coincides with the peak of dustcontinuum and [C II] emissions. Together with its relatively high brightnesstemperature ($\geq8\times10^{6}$ K), we interpret the component as aconsequence of non-thermal radio activity powered by the central SMBH, whichlikely originates from a stationary jet base. The resolved-out radio emissionpossibly come from a diffuse jet, quasar-driven winds, or both, while thecontribution by star formation activity is negligible. Moreover, we propose anupdated geometry structure of its multi-wavelength active nucleus and shedlight on the radio quasar selection bias towards the blazars at $z>4$.

The hyperluminous, dust-obscured quasar W2246-0526 at z=4.6: detection of parsec-scale radio activity