QSO J1427+3312
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QSO J1427+3312 is a radio-loud quasar that lies at a distance of redshift z=6.12. This object was one of the highest redshift radio-loud quasars discovered.[1] Observation of QSO J1427+3312 suggests that it might be a compact symmetric object that is surrounded by a dense interstellar medium in the host galaxy.[1] [2]
The brightness temperature of QSO J1427+3312 is of order 107 to 108 K.[1]