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We report 250 GHz (1.2 mm) observations of a sample of 20 QSOs at redshifts5.8<z<6.5 from the the Canada-France High-z Quasar Survey (CFHQS), using theMax-Planck Millimeter Bolometer (MAMBO) array at the IRAM 30-metre telescope. Arms sensitivity <~ 0.6 mJy was achieved for 65% of the sample, and <~ 1.0 mJyfor 90%. Only one QSO, CFHQS J142952+544717, was robustly detected withS_250GHz = 3.46 +/-0.52 mJy. This indicates that one of the most powerful knownstarbursts at z~6 is associated with this radio loud QSO. On average, the otherCFHQS QSOs, which have a mean optical magnitude fainter than previously studiedSDSS samples of z~6 QSOs, have a mean 1.2 mm flux density <S_250GHz> = 0.41+/-0.14 mJy; such a 2.9-sigma average detection is hardly meaningful. It wouldcorrespond to <L_FIR> ~ 0.94+/-0.32 10^12 Lo, and an average star formationrate of a few 100's Mo/yr, depending on the IMF and a possible AGN contributionto <L_FIR>. This is consistent with previous findings of Wang et al. (2011) onthe far-infrared emission of z~6 QSOs and extends them toward optically faintersources.

The Canada-France High-z Quasar Survey: 1.2mm Observations