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Past observations of QSO host galaxies at z >6 have found cold gas and starformation on compact scales of a few kiloparsecs. We present new highsensitivity IRAM PdBI follow-up observations of the [CII] 158micron emissionline and FIR continuum in the host galaxy of SDSS J1148+5152, a luminous QSO atredshift 6.4189. We find that a large fraction of the gas traced by [CII] is athigh velocities, up to ~1400 km/s relative to the systemic velocity, confirmingthe presence of a major quasar-driven outflow indicated by previousobservations. The outflow has a complex morphology and reaches a maximumprojected radius of ~30 kpc. The extreme spatial extent of the outflow allowsus, for the first time in an external galaxy, to estimate mass-loss rate,kinetic power and momentum rate of the outflow as a function of the projecteddistance from the nucleus and the dynamical time-scale. These trends revealmultiple outflow events during the past 100 Myr, although the bulk of the mass,energy and momentum appear to have been released more recently, within the past~20 Myr. Surprisingly, we discover that also the quiescent gas at systemicvelocity is extremely extended. More specifically, we find that, while 30% ofthe [CII] within v\in(-200, 200) km/s traces a compact component that is notresolved by our observations, 70% of the [CII] emission in this velocity rangeis extended, with a projected FWHM size of 17.4+-1.4 kpc. We detect FIRcontinuum emission associated with both the compact and the extended [CII]components, although the extended FIR emission has a FWHM of 11+-3 kpc, thussmaller than the extended [CII] source. Overall, our results indicate that thecold gas traced by [CII] is distributed up to r~30 kpc. A large fraction ofextended [CII] is likely associated with star formation on large scales, butthe [CII] source extends well beyond the FIR continuum.

Very extended cold gas, star formation and outflows in the halo of a bright QSO at z>6