Quasar feedback revealed by giant molecular outflows C. Feruglio, R. Maiolino, E. Piconcelli, N. Menci, H. Aussel, A. Lamastra and F. Fiore A&A, 518 (2010) L155 Published online: 24 August 2010 DOI: 10.1051/0004-6361/201015164