We present an unprecedented view on the morphology and kinematics of the extended narrow-line region ( ENLR ) and molecular gas around the prototypical hyper-luminous quasar 3C 273 ( L _ { \mathrm { bol } } \sim 10 ^ { 47 } \mathrm { erg s } ^ { -1 } at z = 0.158 ) based on VLT-MUSE optical 3D spectroscopy and ALMA observations .
We find that : 1 ) The ENLR size of 12.1 \pm 0.2 kpc implies a smooth continuation of the size-luminosity relation out to large radii or a much larger break radius as previously proposed .
2 ) The kinematically disturbed ionized gas with line splits reaching 1000 \mathrm { km s } ^ { -1 } out to 6.1 \pm 1.5 kpc is aligned along the jet axis .
3 ) The extreme line broadening on kpc scales is caused by spatial and spectral blending of many distinct gas clouds separated on sub-arcsecond scales with different line-of-sight velocities .
The ENLR velocity field combined with the known jet orientation rule out a simple scenario of a radiatively-driven radial expansion of the outflow .
Instead we propose that a pressurized expanding hot gas cocoon created by the radio jet is impacting on an inclined gas disk leading to transverse and/or backflow motion with respect to our line-of-sight .
The molecular gas morphology may either be explained by a density wave at the front of the outflow expanding along the jet direction as predicted by positive feedback scenario or the cold gas may be trapped in a stellar over-density caused by a recent merger event .
Using 3C 273 as a template for observations of high-redshift hyper-luminous AGN reveals that large-scale ENLRs and kpc scale outflows may often be missed due to the brightness of the nuclei and the limited sensitivity of current near-IR instrumentation .