The obstructed jet in Mrk 231

Mrk~231 is the closest radio-quiet quasar known and one of most luminous infrared galaxies in local Universe. It characterised by co-existence a radio jet powerful multi-phase multi-scale outflows, making it an ideal laboratory to study active galactic nucleus (AGN) feedback. We analyse multi-epoch very long baseline interferometry data estimate head advance speed be $\lesssim0.013\ c$, suggesting sub-relativistic flow. The position angle changes from $-113^\circ$ inner parsec $-172^\circ$ at projected distance 25 parsec. structure change might result either bending following rotation circum-nuclear disc or projection helical on plane sky. In large opening ($\sim60^\circ$) cone, curved interacts with interstellar medium creates wide-aperture-angle shocks which subsequently dissipate portion power through radiation contribute powering large-scale outflows. low bent jet, as well extensive dissipation, are consistent obstruction short-length host galaxy's environment.