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We present ALMA observations of two moderate luminosity quasars at redshift6. These quasars from the Canada-France High-z Quasar Survey (CFHQS) have blackhole masses of ~10^8 M_solar. Both quasars are detected in the [CII] line anddust continuum. Combining these data with our previous study of two similarCFHQS quasars we investigate the population properties. We show that z>6quasars have a significantly lower far-infrared luminosity thanbolometric-luminosity-matched samples at lower redshift, inferring a lower starformation rate, possibly correlated with the lower black hole masses at z=6.The ratios of [CII] to far-infrared luminosities in the CFHQS quasars arecomparable with those of starbursts of similar star formation rate in the localuniverse. We determine values of velocity dispersion and dynamical mass for thequasar host galaxies based on the [CII] data. We find that there is nosignificant offset from the relations defined by nearby galaxies with similarblack hole masses. There is however a marked increase in the scatter at z=6,beyond the large observational uncertainties.

Star formation rate and dynamical mass of 10^8 solar mass black hole host galaxies at redshift 6