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• W3100521758 endingPage "A65" @default.
• W3100521758 startingPage "A65" @default.
• W3100521758 abstract "We present a detailed analysis of the gas conditions in the H<sub>2<sub/> luminous radio galaxy 3C 326 N at <i>z<i/> ~ 0.1, which has a low star-formation rate (<i>SFR<i/> ~ 0.07 yr<sup>-1<sup/>) in spite of a gas surface density similar to those in starburst galaxies. Its star-formation efficiency is likely a factor ~10–50 lower than those of ordinary star-forming galaxies. Combining new IRAM CO emission-line interferometry with existing Spitzer mid-infrared spectroscopy, we find that the luminosity ratio of CO and pure rotational H<sub>2<sub/> line emission is factors 10–100 lower than what is usually found. This suggests that most of the molecular gas is warm. The Na D absorption-line profile of 3C 326 N in the optical suggests an outflow with a terminal velocity of ~–1800 km s<sup>-1<sup/> and a mass outflow rate of 30–40 yr<sup>-1<sup/>, which cannot be explained by star formation. The mechanical power implied by the wind, of order 10<sup>43<sup/> erg s<sup>-1<sup/>, is comparable to the bolometric luminosity of the emission lines of ionized and molecular gas. To explain these observations, we propose a scenario where a small fraction of the mechanical energy of the radio jet is deposited in the interstellar medium of 3C 326 N, which powers the outflow, and the line emission through a mass, momentum and energy exchange between the different gas phases of the ISM. Dissipation times are of order 10<sup>7<sup/><sup>-8<sup/> yrs, similar or greater than the typical jet lifetime. Small ratios of CO and PAH surface brightnesses in another 7 H<sub>2<sub/> luminous radio galaxies suggest that a similar form of AGN feedback could be lowering star-formation efficiencies in these galaxies in a similar way. The local demographics of radio-loud AGN suggests that secular gas cooling in massive early-type galaxies of <i>≥<i/>10<sup>11<sup/> could generally be regulated through a fundamentally similar form of “maintenance-phase” AGN feedback." @default.
• W3100521758 created "2020-11-23" @default.
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• W3100521758 date "2010-10-01" @default.
• W3100521758 modified "2023-10-09" @default.
• W3100521758 title "Energetics of the molecular gas in the H₂luminous radio galaxy 3C 326: Evidence for negative AGN feedback" @default.
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