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ALMA observations of feeding and feedback in nearby Seyfert galaxies: an AGN-driven outflow in NGC 1433

Authors :
Francoise Combes
Viviana Casasola
Frédéric Boone
Andrew J. Baker
Santiago García-Burillo
Eva Schinnerer
Leslie K. Hunt
Roberto Neri
Linda J. Tacconi
Melanie Krips
Isabel Márquez
Andreas Eckart
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA)
École normale supérieure - Paris (ENS Paris)
Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris
Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP)
Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS)
Observatorio Astronomico Nacional [Madrid] (OAN)
Instituto Geografico Nacional (IGN)
Istituto Nazionale di Astrofisica (INAF)
INAF - Osservatorio Astrofisico di Arcetri (OAA)
Institut de RadioAstronomie Millimétrique (IRAM)
Centre National de la Recherche Scientifique (CNRS)
Department of Geography
Newcastle University [Newcastle]
Institut de recherche en astrophysique et planétologie (IRAP)
Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3)
Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP)
Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)
Max-Planck-Institut für Radioastronomie (MPIFR)
Instituto de Astrofísica de Andalucía (IAA)
Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)
Max-Planck-Institut für Astronomie (MPIA)
Max-Planck-Gesellschaft
Max Planck Institute for Extraterrestrial Physics (MPE)
École normale supérieure - Paris (ENS-PSL)
Observatorio Astronomico Nacional, Madrid
Université Toulouse III - Paul Sabatier (UT3)
Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP)
Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3)
Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)
Source :
Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2013, 558, pp.A124. ⟨10.1051/0004-6361/201322288⟩, Astronomy and Astrophysics-A&A, 2013, 558, pp.A124. ⟨10.1051/0004-6361/201322288⟩, Astronomy & Astrophysics
Publication Year :
2013

Abstract

We report ALMA observations of CO(3-2) emission in the Seyfert 2 double-barred galaxy NGC1433, at the unprecedented spatial resolution of 0.5"=24 pc. Our aim is to probe AGN feeding and feedback phenomena through the morphology and dynamics of the gas inside the central kpc. The CO map, which covers the whole nuclear region (nuclear bar and ring), reveals a nuclear gaseous spiral structure, inside the nuclear ring encircling the nuclear stellar bar. This gaseous spiral is well correlated with the dusty spiral seen in Hubble Space Telescope images. The nuclear spiral winds up in a pseudo-ring at 200 pc radius, which might correspond to the inner ILR. Continuum emission is detected at 0.87 mm only at the very centre, and its origin is more likely thermal dust emission than non-thermal emission from the AGN. It might correspond to the molecular torus expected to exist in this Seyfert 2 galaxy. The HCN(4-3) and HCO+(4-3) lines were observed simultaneously, but only upper limits are derived, with a ratio to the CO(3-2) line lower than 1/60 at 3sigma, indicating a relatively low abundance of very dense gas. The kinematics of the gas over the nuclear disk reveal rather regular rotation only slightly perturbed by streaming motions due to the spiral; the primary and secondary bars are too closely aligned with the galaxy major or minor axis to leave a signature in the projected velocities. Near the nucleus, there is an intense high-velocity CO emission feature redshifted to 200 km/s (if located in the plane), with a blue-shifted counterpart, at 2" (100 pc) from the centre. While the CO spectra are quite narrow in the centre, this wide component is interpreted as an outflow involving a molecular mass of 3.6 10^6 Mo and a flow rate 7 Mo/yr. The flow could be in part driven by the central star formation, but is mainly boosted by the AGN through its wind or radio jets.<br />11 pages, 9 figures, Accepted in Astronomy and Astrophysics

Details

Language :
English
ISSN :
00046361
Database :
OpenAIRE
Journal :
Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2013, 558, pp.A124. ⟨10.1051/0004-6361/201322288⟩, Astronomy and Astrophysics-A&A, 2013, 558, pp.A124. ⟨10.1051/0004-6361/201322288⟩, Astronomy & Astrophysics
Accession number :
edsair.doi.dedup.....6d0932bd63d8ee3a89e764761347bac0
Full Text :
https://doi.org/10.1051/0004-6361/201322288⟩