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The interactions between radio jets and the interstellar medium play adefining role for the co-evolution of central supermassive black holes andtheir host galaxies, but observational constraints on these feedback processesare still very limited at redshifts $z > 2$. We investigate the radio-loudquasar PSO J352.4034-15.3373 at $z \sim 6$ at the edge of the Epoch ofReionization. This quasar is among the most powerful radio emitters and thefirst one with direct evidence of extended radio jets ($\sim$1.6 kpc) at thesehigh redshifts. We analyze NOEMA and ALMA millimeter data targeting the CO(6-5) and [CII] far-infrared emission lines, respectively, and the underlyingcontinuum. The broad $440\pm 80$ km s$^{-1}$ and marginally resolved [CII]emission line yields a systemic redshift of $z\!=\!5.832 \pm 0.001$.Additionally, we report a strong 215 MHz radio continuum detection, $88\pm 7$mJy, using the GMRT. This measurement significantly improves the constraints atthe low-frequency end of the spectral energy distribution of this quasar. Incontrast to what is typically observed in high-redshift radio-quiet quasars, weshow that cold dust emission alone cannot reproduce the millimeter continuummeasurements. This is evidence that the strong synchrotron emission from thequasar contributes substantially to the emission even at millimeter(far-infrared in the rest-frame) wavelengths. This quasar is an ideal system toprobe the effects of radio jets during the formation of a massive galaxy withinthe first Gyr of the Universe.

The Impact of Powerful Jets on the Far-infrared Emission of an Extreme Radio Quasar at z~6