Abstract
Abstract We report the discovery of a unique quasar-dusty star-forming galaxy (DSFG) system at z = 5.63, consisting of the bright quasar J1133+1603 (M UV = − 27.42) and its compact, dust-obscured companion, J1133c. ALMA observations reveal a prominent [C II] bridge connecting the quasar and DSFG, indicating ongoing interaction at a projected separation of 1 . ″ 8 (∼10 proper kpc). J1133c exhibits unusually bright and broad [C II] emission (L [C II] > 1043 erg s −1, FWHM > 500 km s−1), with a [C II] luminosity five times that of the quasar, suggesting intense star formation or potential active galactic nucleus activity. The inferred star formation rate from [C II] is approximately 103 M ⊙ yr −1. The remarkable properties of this pair strongly suggest that galaxy interactions may simultaneously trigger both starburst and quasar activity, driving rapid evolution in the early universe.
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