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The transport of gas towards the centre of galaxies is critical for blackhole feeding and, indirectly, it can control active galactic nucleus (AGN)feedback. We have quantified the molecular gas inflow in the central R<1kpc ofM51 to be 1 Msun/yr, using a new gravitational torque map and the molecular gastraced by the PdBI Arcsecond Whirlpool Survey (PAWS). The nuclear stellar baris responsible for this gas inflow. We have also used torque profiles toestimate the location of dynamical resonances, suggesting a corotation for thebar at R~20", and a corotation for the spiral at R~100". We demonstrate howimportant it is to correct 3.6um images for dust emission in order to computegravitational torques, and we carefully examine further sources of uncertainty.Our observational measurement of gas inflow can be compared with nuclearmolecular outflow rates and provide useful constraints for numericalsimulations.

Gravitational torques imply molecular gas inflow towards the nucleus of M51