Galactic-scale Feedback Observed in the 3C 298 Quasar Host Galaxy

We present high angular resolution multiwavelength data of the 3C 298 radio-loud quasar host galaxy (z = 1.439) taken using the W. M. Keck Observatory OSIRIS integral field spectrograph (IFS) with adaptive optics, the Atacama Large Millimeter/submillimeter Array (ALMA), the Hubble Space Telescope (HST) WFC3, and the Very Large Array (VLA). Extended emission is detected in the rest-frame optical nebular emission lines H beta, [O III], H alpha, [N II], and [S II], as well as in the molecular lines CO (J=3-2) and (J = 5-4). Along the path of the relativistic jets of 3C 298, we detect conical outflows in ionized gas emission with velocities of up to 1700 km s(-1). and an outflow rate of 450-1500 M-circle dot yr(-1) extended over 12 kpc. Near the spatial center of the conical outflow, CO (J = 3-2) emission shows a molecular gas disk with a rotational velocity of. +/- 150 km s(-1) and total molecular mass (M-H2) of 6.6 +/- 0.36 x 10(9) M-circle dot On the blueshifted side of the molecular disk, we observe broad extended emission that is due to a molecular outflow with a rate of 2300 M-circle dot yr(-1) and depletion timescale of 3 Myr. We detect no narrow Ha. emission in the outflow regions, suggesting a limit on star formation of 0.3 M(circle dot)yr(-1) kpc(-2). Quasardriven winds are evacuating the molecular gas reservoir, thereby directly impacting star formation in the host galaxy. The observed mass of the supermassive black hole is 10(9.37-9.56) M-circle dot, and we determine a dynamical bulge mass of M-bulge = 1-1.7 x 10(10) R/1.6kpc M-circle dot. The bulge mass of 3C 298 lies 2-2.5 orders of magnitude below the expected value from the local galactic bulge-supermassive black hole mass (M-bulge-M-BH) relationship. A second galactic disk observed in nebular emission is offset from the quasar by 9 kpc, suggesting that the system is an intermediate-stage merger. These results show that galactic-scale negative feedback is occurring early in the merger phase of 3C 298, well before the coalescence of the galactic nuclei and assembly on the local M-bulge-M-BH relationship.