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We present a result of the quasar CO(J=6-5) observations of SDSSpJ104433.04-012502.2 at z = 5.8. Ten-days observations with the NobeyamaMillimeter Array yielded an rms noise level of ~ 2.1 mJy/beam in a frequencyrange from 101.28 GHz to 101.99 GHz at a velocity resolution of 120 km/s. Nosignificant clear emission line was detected in the observed field andfrequency range. Three sigma upper limit on the CO(J=6-5) luminosity of theobject is 2.8 x 10^10 K km/s pc^2, corresponding to a molecular gas mass of 1.2x 10^11 Solar Mass, if a conversion factor of 4.5 Solar Mass /(K km/s pc^2) isadopted. The obtained upper limit on CO luminosity is slightly smaller thanthose observed in quasars at z=4-5 toward which CO emissions are detected.Comment: 4 pages, 3 figures, LaTeX2e, to appear in Publication of Astronomical  Society of Japan (PASJ), Postscript file available at  ftp://ftp.kusastro.kyoto-u.ac.jp/pub/iwata/preprint/sdss1044/sdss.ps.g

CO ($J=6-5$) Observations of the Quasar SDSS 1044$-$0125 at $z = 5.8$: Fig. 1