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We have detected emission by the CO 5-4 and 6-5 rotational transitions at $z= 5.7722\pm 0.0006$ from the host galaxy of the SDSS quasar J0927+2001 usingthe Plateau de Bure interferometer. The peak line flux density for the CO 5-4line is $0.72 \pm 0.09$ mJy, with a line FWHM = $610 \pm 110$ km s$^{-1}$. Theimplied molecular gas mass is $(1.6 \pm 0.3) \times 10^{10}$ M$_\odot$. We alsodetect the 90 GHz continuum at $0.12 \pm 0.03$ mJy, consistent with a 47K dustspectrum extrapolated from higher frequencies. J0927+2001 is the second exampleof a huge molecular gas reservoir within the host galaxy of a quasar within 1Gyr of the big bang. Observations of J0927+2001 are consistent with a massivestarburst coeval with a bright quasar phase in the galaxy, suggesting the rapidformation of both a super-massive black hole through accretion, and the stellarhost spheroid, at a time close to the end of cosmic reionization.

Detection of $1.6\times 10^{10}$ M$_\odot$ of molecular gas in the host galaxy of the $z=5.77$ SDSS quasar J0927+2001