The diverse cold molecular gas contents, morphologies, and kinematics of
  type-2 quasars as seen by ALMA
  We present CO(2-1) and adjacent continuum observations of 7 nearby
radio-quiet type-2 quasars (QSO2s) obtained with ALMA at ~0.2" resolution (370
pc at z~0.1). The CO morphologies are diverse, including disks and interacting
systems. Two of the QSO2s are red early-type galaxies with no CO(2-1) detected.
In the interacting galaxies, the central kpc contains 18-25% of the total cold
molecular gas, whereas in the spirals it is only 5-12%. J1010+0612 and
J1430+1339 show double-peaked CO morphologies which do not have optical
counterparts. Based on our analysis of the ionized and molecular kinematics and
mm continuum emission, these CO morphologies are most likely produced by AGN
feedback in the form of outflows, jets, and/or shocks. The CO kinematics of the
QSO2s are dominated by rotation but also reveal noncircular motions. According
to our analysis of the kinematics, these noncircular motions correspond to
molecular outflows mostly coplanar with the CO discs in four of the QSO2s, and
either to a coplanar inflow or vertical outflow in the case of J1010+0612.
These outflows represent 0.2-0.7% of the QSO2s' total molecular gas mass and
have maximum velocities of 200-350 km/s, radii from 0.4 to 1.3 kpc, and outflow
rates of 8-16 Msun/yr. These properties are intermediate between those of the
mild molecular outflows measured for Seyferts, and the fast and energetic
outflows of ULIRGs. This suggests that it is not only AGN luminosity that
drives massive molecular outflows. Other factors such as jet power, coupling
between winds, jets, and/or ionized outflows and the CO discs, and amount or
geometry of dense gas in the nuclear regions might be also relevant. Thus,
although we do not find evidence for a significant impact of quasar feedback on
the total molecular gas reservoirs and SFRs, it appears to be modifying the
distribution of cold molecular gas in the central kpc of the galaxies.
