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Title: Fueling active galactic nuclei. II. Spatially resolved molecular inflows and outflows

We analyze the two-dimensional distribution and kinematics of the stars as well as molecular and ionized gas in the central few hundred parsecs of five active and five matched inactive galaxies. The equivalent widths of the Brγ line indicate that there is no ongoing star formation in their nuclei, although recent (terminated) starbursts are possible in the active galaxies. The stellar velocity fields show no signs of non-circular motions, while the 1-0 S(1) H{sub 2} kinematics exhibit significant deviations from simple circular rotation. In the active galaxies the H{sub 2} kinematics reveal inflow and outflow superimposed on disk rotation. Steady-state circumnuclear inflow is seen in three active galactic nuclei (AGNs), and hydrodynamical models indicate it can be driven by a large-scale bar. In three of the five AGNs, molecular outflows are spatially resolved. The outflows are oriented such that they intersect, or have an edge close to, the disk, which may be the source of molecular gas in the outflow. The relatively low speeds imply the gas will fall back onto the disk, and with moderate outflow rates, they will have only a local impact on the host galaxy. H{sub 2} was detected in two inactive galaxies. These exhibit chaoticmore » circumnuclear dust morphologies and have molecular structures that are counter-rotating with respect to the main gas component, which could lead to gas inflow in the near future. In our sample, all four galaxies with chaotic dust morphology in the circumnuclear region exist in moderately dense groups with 10-15 members where accretion of stripped gas can easily occur.« less
Authors:
; ; ; ; ; ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8]
  1. Max-Planck-Institute für Extraterrestrische Physik, Postfach 1312, D-85741 Garching (Germany)
  2. Astrophysics Research Institute, Liverpool John Moores University, IC2 Liverpool Science Park, 146 Brownlow Hill, L3 5RF (United Kingdom)
  3. Astronomy Department, University of Alaska, Anchorage, Alaska 99508 (United States)
  4. European Southern Observatory, Karl-Schwarzschild Str. 1, D-85748 Garching (Germany)
  5. Institut de Radio Astronomie Millimétrique (IRAM), 300 Rue de la Piscine, Domaine Universitaire, F-38406 Saint Martin d'Heres (France)
  6. Astronomy Division, University of California, Los Angeles, CA 90095-1562 (United States)
  7. Center for Astrophysics and Space Astronomy, University of Colorado, Boulder, CO 80309-0389 (United States)
  8. Department of Astronomy, University of Washington Seattle, WA 98195 (United States)
Publication Date:
OSTI Identifier:
22365117
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 792; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CHAOS THEORY; DISTRIBUTION; DUSTS; GALAXIES; GALAXY NUCLEI; HYDROGEN; MOLECULAR STRUCTURE; STARS; STEADY-STATE CONDITIONS; TWO-DIMENSIONAL CALCULATIONS; VELOCITY