A wide dispersion in star formation rate and dynamical mass of 10^8
  solar mass black hole host galaxies at redshift 6
  ALMA [CII] line and continuum observations of five redshift z>6 quasars are
presented. This sample was selected to probe lower black hole mass quasars than
most previous studies. We find a wide dispersion in properties with CFHQS
J0216-0455, a low-luminosity quasar with absolute magnitude M_1450=-22.2,
remaining undetected implying a limit on the star formation rate in the host
galaxy of <10 solar masses per year, whereas other host galaxies have star
formation rates up to hundreds of solar masses per year. Two other quasars have
particularly interesting properties. VIMOS2911 is one of the least luminous z>6
quasars known with M_1450=-23.1, yet its host galaxy is experiencing a very
powerful starburst. PSO J167-13 has a broad and luminous [CII] line and a
neighbouring galaxy a projected distance of 5kpc away that is also detected in
the [CII] line and continuum. Combining with similar observations from the
literature, we study the ratio of [CII] line to far-infrared luminosity finding
this ratio increases at high-redshift at a fixed far-infrared luminosity,
likely due to lower dust content, lower metallicity and/or higher gas masses.
We compile a sample of 21 high-redshift quasars with dynamical masses and
investigate the relationship between black hole mass and dynamical mass. The
new observations presented here reveal dynamical masses consistent with the
relationship defined by local galaxies. However, the full sample shows a very
wide scatter across the black hole mass - dynamical mass plane, whereas both
the local relationship and simulations of high-redshift quasars show a much
lower dispersion in dynamical mass.
