Massive molecular outflows and evidence for AGN feedback from CO observations
Claudia Cicone,Roberto Maiolino,E. Sturm,J. Gracia-Carpio,Chiara Feruglio,Roberto Neri,Susanne Aalto,Ric Davies,Fabrizio Fiore,J. Fischer,Santiago García-Burillo,Eduardo González-Alfonso,S. Hailey-Dunsheath,Enrico Piconcelli,Sylvain Veilleux +14 more
TL;DR: In this paper, the authors studied the properties of massive, galactic-scale outflows of molecular gas and investigated their impact on galaxy evolution, finding that the presence of an active galactic nucleus (AGN) can boost the outflow rate by a large factor, which is found to increase with the L-AGN/L-bol ratio.
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Abstract: We study the properties of massive, galactic-scale outflows of molecular gas and investigate their impact on galaxy evolution. We present new IRAMPdBI CO(1-0) observations of local ultra-luminous infrared galaxies (ULIRGs) and quasar-hosts: a clear signature of massive and energetic molecular outflows, extending on kpc scales, is found in the CO(1-0) kinematics of four out of seven sources, with measured outflow rates of several 100M(circle dot)yr(-1). We combine these new observations with data from the literature, and explore the nature and origin of massive molecular outflows within an extended sample of 19 local galaxies. We find that starburst-dominated galaxies have an outflow rate comparable to their star formation rate (SFR), or even higher by a factor of similar to 2-4, implying that starbursts can indeed be effective in removing cold gas from galaxies. Nevertheless, our results suggest that the presence of an active galactic nucleus (AGN) can boost the outflow rate by a large factor, which is found to increase with the L-AGN/L-bol ratio. The gas depletion time scales due to molecular outflows are anti-correlated with the presence and luminosity of an AGN in these galaxies, and range from a few hundred million years in starburst galaxies down to just a few million years in galaxies hosting powerful AGNs. In quasar hosts, the depletion time scales due to the outflow are much shorter than the depletion time scales due to star formation. We estimate the outflow kinetic power and find that, for galaxies hosting powerful AGNs, it corresponds to about 5% of the AGN luminosity, as expected by models of AGN feedback. Moreover, we find that momentum rates of about 20 L-AGN/c are common among the AGN-dominated sources in our sample. For "pure" starburst galaxies, our data tentatively support models in which outflows are mostly momentum-driven by the radiation pressure from young stars onto dusty clouds. Overall, our results indicate that, although starbursts are effective in powering massive molecular outflows, the presence of an AGN may strongly enhance such outflows, and therefore have a profound feedback effect on the evolution of galaxies by efficiently removing fuel for star formation, hence quenching star formation.
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Citations
AGNIFS survey of local AGN: GMOS-IFU data and outflows in 30 sources
D. Ruschel-Dutra,Thaisa Storchi-Bergmann,Allan Schnorr-Müller,Rogemar A. Riffel,B. Dall'Agnol de Oliveira,D. Lena,D. Lena,D. Lena,Andrew Robinson,Neil M. Nagar,Martin Elvis +10 more
TL;DR: In this article, the authors analyzed optical data cubes of the inner kiloparsec of 30 local (z ≤ 0.02) active galactic nucleus (AGN) hosts that their research group, AGNIFS, has collected over the past decade via observations with the integral field units of the Gemini Multi-Object Spectrographs.
A 13CO detection in a brightest cluster galaxy.
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TL;DR: Agarwal et al. as discussed by the authors won the Chandra Award for the first time in 2003. National Aeronautics and Space Administration (Chandra Award Number G05-16134X)
Observing AGN feedback with CO intensity mapping
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