Radio Observations of Cool Gas, Dust, and Star Formation in the First Galaxies

摘要

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