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Black hole feeding ...
Black hole feeding and star formation in NGC 1808
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- Audibert, A. (author)
- Observatoire de Paris,Paris Observatory,Instituto de Astrofísica de Canarias,National Observatory of Athens,Universidad de la Laguna,University of La Laguna
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- Combes, F. (author)
- Collège de France,Observatoire de Paris,Paris Observatory
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- Burillo, S. G. (author)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Hunt, L. K. (author)
- Osservatorio Astrofisico di Arcetri,Arcetri Astrophysical Observatory
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- Eckart, A. (author)
- Universität zu Köln,University of Cologne
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- Aalto, Susanne, 1964 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Casasola, V. (author)
- Istituto di Radioastronomia
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- Boone, F. (author)
- Institut de Recherche en Astrophysique et Planétologie (IRAP)
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- Krips, M. (author)
- Institut de Radioastronomie Millimétrique (IRAM)
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- Viti, Serena (author)
- University College London (UCL),Universiteit Leiden (UL),Leiden University (UL)
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- Muller, Sebastien, 1976 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Dasyra, K. M. (author)
- National Observatory of Athens,University of Athens
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- van der Werf, P. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Martin, S. (author)
- European Southern Observatory Santiago,Atacama Large Millimeter-submillimeter Array (ALMA)
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(creator_code:org_t)
- 2021-12-03
- 2021
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 656
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Abstract
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- We report on Atacama Large Millimeter Array (ALMA) observations of CO(3-2) emission in the Seyfert2/starburst galaxy NGC1808, at a spatial resolution of 4 pc. Our aim is to investigate the morphology and dynamics of the gas inside the central 0.5 kpc and to probe the nuclear feeding and feedback phenomena. We discovered a nuclear spiral of radius 100 = 45 pc. Within it, we found a decoupled circumnuclear disk or molecular torus of a radius of 0:1300 = 6 pc. The HCN(4-3) and HCO+(4-3) and CS(7-6) dense gas line tracers were simultaneously mapped and detected in the nuclear spiral and they present the same misalignment in the molecular torus. At the nucleus, the HCN/HCO+ and HCN/CS ratios indicate the presence of an active galactic nucleus (AGN). The molecular gas shows regular rotation, within a radius of 400 pc, except for the misaligned disk inside the nuclear spiral arms. The computations of the torques exerted on the gas by the barred stellar potential reveal that the gas within a radius of 100 pc is feeding the nucleus on a timescale of five rotations or on an average timescale of 60 Myr. Some non-circular motions are observed towards the center, corresponding to the nuclear spiral arms. We cannot rule out that small extra kinematic perturbations could be interpreted as a weak outflow attributed to AGN feedback. The molecular outflow detected at 250 pc in the NE direction is likely due to supernovae feedback and it is connected to the kpc-scale superwind.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Keyword
- Galaxies: kinematics and dynamics
- Galaxies: nuclei
- Galaxies: ISM
- Galaxies: starburst
- Galaxies: individual: NGC 1808
- Galaxies: active
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Audibert, A.
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Combes, F.
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Burillo, S. G.
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Hunt, L. K.
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Eckart, A.
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Aalto, Susanne, ...
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show more...
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Casasola, V.
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Boone, F.
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Krips, M.
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Viti, Serena
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Muller, Sebastie ...
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Dasyra, K. M.
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van der Werf, P.
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Martin, S.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Fusion Plasma an ...
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Astronomy and As ...
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Chalmers University of Technology