Massive Molecular Outflows and Evidence for AGN Feedback from CO Observations

摘要: We study the properties of massive, galactic-scale outflows molecular gas and investigate their impact on galaxy evolution. present new IRAM PdBI CO(1-0) observations local ULIRGs QSO hosts: clear signature massive energetic outflows, extending kpc scales, is found in kinematics four out seven sources, with measured outflow rates several 100 Msun/yr. combine these data from literature, explore nature origin within an extended sample 19 galaxies. find that starburst-dominated galaxies have rate comparable to SFR, or even higher by a factor ~ 2-4, implying starbursts can indeed be effective removing cold Nevertheless, our results suggest presence AGN boost large factor, which increase L_AGN/L_bol ratio. The depletion time-scales due are anti-correlated luminosity galaxies, range few hundred million years starburst down just hosting powerful AGNs. In quasar hosts much shorter than star formation. estimate kinetic power that, for AGNs, it corresponds about 5% luminosity, as expected models feedback. Moreover, we momentum 20 L_AGN/c common among AGN-dominated sources sample. For "pure" tentatively support mostly momentum-driven radiation pressure young stars onto dusty clouds.