2015ApJ...805L...8B

The [C ii] 158 µm fine-structure line is known to trace regions of active star formation and is the main coolant of the cold, neutral atomic medium. In this Letter, we report a strong detection of the [C ii] line in the host galaxy of the brightest quasar known at z > 6.5, the Pan-STARRS1 selected quasar PSO J036.5078+03.0498 (hereafter P036+03), using the IRAM NOEMA millimeter interferometer. Its [C ii] and total far-infrared luminosities are 5.8 ± 0.7) x 10⁹ L_☉ and (7.6 ± 1.5) x 10¹²L_☉, respectively. This results in an L_[CII]/L_TIR ratio of ∼ 0.8 x 10^–3, which is at the high end of those found for active galaxies, though it is lower than the average found in typical main-sequence galaxies at z ∼ 0. We also report a tentative additional line that we identify as a blended emission from the 3₂₂ - 3₁₃ and 5₂₃ - 4₃₂ H₂ O transitions. If confirmed, this would be the most distant detection of water emission to date. P036+03 rivals the current prototypical luminous J1148+5251 quasar at z = 6.42, in both rest-frame UV and [C ii] luminosities. Given its brightness and because it is visible from both hemispheres (unlike J1148+5251), P036+03 has the potential of becoming an important laboratory for the study of star formation and of the interstellar medium only ∼800 Myr after the Big Bang.