We summarize cm through submm observations of the host galaxies of z \sim 6 quasars .
These observations reveal the cool molecular gas ( the fuel for star formation ) , the warm dust ( heated by star formation ) , the fine structure line emission ( tracing the CNM and PDRs ) , and the synchrotron emission .
Our results imply active star formation in \sim 30 \% of the host galaxies , with star formation rates \sim 10 ^ { 3 } M _ { \odot } year ^ { -1 } , and molecular gas masses \sim 10 ^ { 10 } M _ { \odot } .
Imaging of the [ CII ] emission from the most distant quasar reveals a ’ maximal starburst disk ’ on a scale \sim 1.5 kpc .
Gas dynamical studies suggest a departure of these galaxies from the low- z M _ { BH } – M _ { bulge } relation , with the black holes being , on average , 15 times more massive than expected .
Overall , we are witnessing the co-eval formation of massive galaxies and supermassive black holes within 1 Gyr of the Big Bang .