Star formation rate and dynamical mass of 10^8 solar mass black hole
  host galaxies at redshift 6
  We present ALMA observations of two moderate luminosity quasars at redshift
6. These quasars from the Canada-France High-z Quasar Survey (CFHQS) have black
hole masses of ~10^8 M_solar. Both quasars are detected in the [CII] line and
dust continuum. Combining these data with our previous study of two similar
CFHQS quasars we investigate the population properties. We show that z>6
quasars have a significantly lower far-infrared luminosity than
bolometric-luminosity-matched samples at lower redshift, inferring a lower star
formation rate, possibly correlated with the lower black hole masses at z=6.
The ratios of [CII] to far-infrared luminosities in the CFHQS quasars are
comparable with those of starbursts of similar star formation rate in the local
universe. We determine values of velocity dispersion and dynamical mass for the
quasar host galaxies based on the [CII] data. We find that there is no
significant offset from the relations defined by nearby galaxies with similar
black hole masses. There is however a marked increase in the scatter at z=6,
beyond the large observational uncertainties.
