Haan, Sebastian and Schinnerer, Eva and Emsellem, Eric and García-Burillo, Santiago and Combes, Francoise and Mundell, Carole G. and Rix, Hans-Walter (2009) Dynamical evolution of AGN host galaxies -— gas in/out-flow rates in seven NUGA galaxies. Astrophysical Journal, 692 (2). pp. 1623-1661. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20090518-145633320
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To examine the role of the host galaxy structure in fueling nuclear activity, we estimated gas flow rates from several kpc down to the inner few 10 pc for seven nearby spiral galaxies, selected from the NUclei of GAlaxies sample. We calculated gravitational torques from near-infrared images and determined gas in/out-flow rates as a function of radius and location within the galactic disks, based on high angular resolution interferometric observations of molecular (CO using Plateau de Bure interferometer) and atomic (H I using the Very Large Array) gas. The results are compared with kinematic evidence for radial gas flows and the dynamical state of the galaxies (via resonances) derived from several different methods. We show that gravitational torques are very efficient at transporting gas from the outer disk all the way into the galaxies centers at ~100 pc; previously assumed dynamical barriers to gas transport, such as the corotation resonance of stellar bars, seem to be overcome by gravitational torque induced gas flows from other nonaxisymmetric structures. The resulting rates of gas mass inflow range from 0.01 to 50 M⊙ yr^(–1) and are larger for the galaxy center than for the outer disk. Our gas flow maps show the action of nested bars within larger bars for three galaxies. Noncircular streaming motions found in the kinematic maps are larger in the center than in the outer disk and appear to correlate only loosely with the in/out-flow rates as a function of radius. We demonstrate that spiral gas disks are very dynamic systems that undergo strong radial evolution on timescales of a few rotation periods (e.g., 5 × 10^8 yrs at a radius of 5 kpc), due to the effectiveness of gravitational torques in redistributing the cold galactic gas.
|Additional Information:||© 2009. American Astronomical Society. Received 2008 July 10, accepted for publication 2008 October 15. Published 2009 February 24. Print publication: Issue 2 (2009 February 20). The authors thank the anonymous referee for helpful comments. A special thanks goes to Anthony Baillard for providing and assisting us with the tool NFIGI for the removal of foreground stars. We are grateful to the National Radio Astronomy Observatory (NRAO) for their support during this project. The NRAO is operated by Associated Universities, Inc., under cooperative agreement with the National Science Foundation. This work is also based on observations carried out with the IRAM Plateau de Bure Interferometer. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain). CGM is grateful for financial support from the Royal Society and Research Councils U.K. SH is supported by the German DFG under grant number SCHI 536/2-1.|
|Subject Keywords:||accretion, accretion disks; galaxies: active; galaxies: individual (NGC3368, NGC3627, NGC4321, NGC4736, NGC5248, NGC6951, NGC7217); galaxies: ISM; galaxies: kinematics and dynamics; galaxies: Seyfert; radio lines: galaxies|
|Official Citation:||Dynamical Evolution of AGN Host Galaxies—Gas In/Out-Flow Rates in Seven NUGA Galaxies Sebastian Haan, Eva Schinnerer, Eric Emsellem, Santiago García-Burillo, Francoise Combes, Carole G. Mundell, and Hans-Walter Rix 2009 ApJ 692 1623-1661 doi: 10.1088/0004-637X/692/2/1623|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Marie Noren|
|Deposited On:||20 Aug 2009 15:10|
|Last Modified:||26 Dec 2012 11:01|
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