Gauging the effect of supermassive black holes feedback on quasar host galaxies

In order to gauge the role that active galactic nuclei play in the evolution of galaxies via the effect of kinetic feedback in nearby QSO 2's (z similar to 0.3), we observed eight such objects with bolometric luminosities L-bol similar to 10(46)erg s(-1) using Gemini Multi-Object Spectrograph-integral field units. The emission lines were fitted with at least two Gaussian curves, the broadest of which we attributed to gas kinetically disturbed by an outflow. We found that the maximum extent of the outflow ranges from similar to 1 to 8 kpc, being similar to 0.5 +/- 0.3 times the extent of the [OIII] ionized gas region. Our 'default' assumptions for the gas density (obtained from the [S II] doublet) and outflow velocities resulted in peak mass outflow rates of. M-out(def) similar to 3-30M(circle dot) yr(-1) and outflow power of E-out(def) similar to 10(41)-10(43) erg s(-1). The corresponding kinetic coupling efficiencies are epsilon(def)(f) = E-out(def)/L-bol similar to 7 x 10(-4)-0.5 per cent, with the average efficiency being only 0.06 per cent (0.01 per cent median), implying little feedback powers from ionized gas outflows in the host galaxies. We investigated the effects of varying assumptions and calculations on. M-out and. E-out regarding the ionized gas densities, velocities, masses, and inclinations of the outflow relative to the plane of the sky, resulting in average uncertainties of 1 dex. In particular, we found that better indicators of the [O III] emitting gas density than the default [S II] line ratio, such as the [Ar IV]lambda lambda 4711,40 line ratio, result in almost an order of magnitude decrease in the epsilon(f).