Molecular line emission in NGC 1068 imaged with ALMA. I. An AGN-driven outflow in the dense molecular gas
Abstract
Aims: We investigate the fueling and the feedback of star formation and nuclear activity in
Methods: We have used the Atacama Large Millimeter Array (ALMA) to map the emission of a set of dense molecular gas (n(H2) ≃ 105 - 6 cm-3) tracers (CO(3-2), CO(6-5), HCN(4-3), HCO+(4-3), and CS(7-6)) and their underlying continuum emission in the central r ~ 2 kpc of
Results: The sensitivity and spatial resolution of ALMA give an unprecedented detailed view of the distribution and kinematics of the dense molecular gas (n(H2) ≥ 105 - 6cm-3) in
Conclusions: The molecular outflow is likely launched when the ionization cone of the narrow line region sweeps the nuclear disk. The outflow rate estimated in the CND, dM/dt~ 63+21-37 M⊙ yr-1, is an order of magnitude higher than the star formation rate at these radii, confirming that the outflow is AGN driven. The power of the AGN is able to account for the estimated momentum and kinetic luminosity of the outflow. The CND mass load rate of the CND outflow implies a very short gas depletion timescale of ≤1 Myr. The CND gas reservoir is likely replenished on longer timescales by efficient gas inflow from the outer disk.
- Publication:
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Astronomy and Astrophysics
- Pub Date:
- July 2014
- DOI:
- 10.1051/0004-6361/201423843
- arXiv:
- arXiv:1405.7706
- Bibcode:
- 2014A&A...567A.125G
- Keywords:
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- galaxies: individual: NGC 1068;
- galaxies: ISM;
- galaxies: kinematics and dynamics;
- galaxies: nuclei;
- galaxies: Seyfert;
- radio lines: galaxies;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- Version accepted for publication in A&