Presentation #309.02 in the session AGN, QSOs, and Galactic Evolution.
Active galactic nuclei (AGN) feedback remains the best explanation for the observed properties of massive galaxies. In order to better understand AGN feedback, observational constraints must be placed on the energy of different feedback mechanisms. The thermal feedback from quasars (or quasi-stellar objects QSOs) is predicted to be sufficient to cause observable decrement in the CMB by Sunyaev-Zeldovich effect (SZE). We observed this decrement by stacking 150 GHz continuum images of 10 QSOs at z=2.03-2.45, observed by the ALMA 12m array as part of the SUPERCOLD-CGM program. We then compared the stacked QSOs to generalized Navarro-Frenk-White (gNFW) profiles to constrain halo mass. We will present observational constraints on the halo mass of high-z quasars based on thermal SZE observations.