AzTEC 1.1 mm images of 16 radio galaxies at 0.5<z<5.2 and a quasar at
  z=6.3
  We present 1.1 mm observations for a sample of 16 powerful radio galaxies at
0.5<z<5.2 and a radio quiet quasar at z=6.3, obtained using the AzTEC bolometer
array mounted on the ASTE or the JCMT. This paper more than doubles the number
of high-z radio galaxies imaged at millimetre/sub-millimetre wavelengths. We
detect probable millimetre-wave counterparts for 11 of the active galaxies. The
6 active galaxies which do not have a probable millimetre counterpart in our
images nevertheless have one or more likely associated millimetric source.
Thus, we conclude that powerful (radio-loud) active galaxies at high-z are
beacons for finding luminous millimetre/sub-millimetre galaxies at high-z. The
flux densities of our AzTEC counterparts imply star formation rates ranging
from <200 to ~1300 M./yr. In addition, we find that for the radio galaxoes the
1.1 mm flux density is anticorrelated with the largest angular size of the
radio source.
  We also present new Spitzer imaging observations of several active galaxies
in our sample. Combining these with archival data, we examine the mid-infrared
colours of our sample. We find that radio galaxies for which we have detected a
probable 1.1 mm counterpart have mid-infrared colours consistent with dusty
starbursts, and are usually bluer than high-z Spitzer-selected active galaxies.
In addition, we find arcs of 24 micron sources extending across ~200-500 kpc,
apparently associated with three of the radio galaxies.
