We report new IRAM/PdBI , JCMT/SCUBA-2 , and VLA observations of the ultraluminous quasar SDSSJ010013.02+280225.8 ( hereafter , J0100+2802 ) at z=6.3 , which hosts the most massive supermassive black hole ( SMBH ) of \mathrm { 1.24 \times 10 ^ { 10 } M _ { \odot } } known at z > 6 .
We detect the [ C II ] 158 \mu m fine structure line and molecular CO ( 6-5 ) line and continuum emission at 353 GHz , 260 GHz , and 3 GHz from this quasar .
The CO ( 2-1 ) line and the underlying continuum at 32 GHz are also marginally detected .
The [ C II ] and CO detections suggest active star formation and highly excited molecular gas in the quasar host galaxy .
The redshift determined with the [ C II ] and CO lines shows a velocity offset of \sim 1000 km s ^ { -1 } from that measured with the quasar Mg II line .
The CO ( 2-1 ) line luminosity provides direct constraint on the molecular gas mass which is about ( 1.0 \pm 0.3 ) \times 10 ^ { 10 } M _ { \odot } .
We estimate the FIR luminosity to be ( 3.5 \pm 0.7 ) \times 10 ^ { 12 } L _ { \odot } , and the UV-to-FIR spectral energy distribution of J0100+2802 is consistent with the templates of the local optically luminous quasars .
The derived [ C II ] -to-FIR luminosity ratio of J0100+2802 is 0.0010 \pm 0.0002 , which is slightly higher than the values of the most FIR luminous quasars at z \sim 6 .
We investigate the constraint on the host galaxy dynamical mass of J0100+2802 based on the [ C II ] line spectrum .
It is likely that this ultraluminous quasar lies above the local SMBH-galaxy mass relationship , unless we are viewing the system at a small inclination angle .