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  Nuclear molecular outflow in the Seyfert galaxy NGC 3227

Alonso-Herrero, A., García-Burillo, S., Pereira-Santaella, M., Davies, R. I., Combes, F., Vestergaard, M., et al. (2019). Nuclear molecular outflow in the Seyfert galaxy NGC 3227. Astronomy and Astrophysics, 628: A65. doi:10.1051/0004-6361/201935431.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-1A97-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-1AA5-4
Genre: Journal Article

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Alonso-Herrero, A., Author
García-Burillo, S., Author
Pereira-Santaella, M., Author
Davies, R. I.1, Author              
Combes, F., Author
Vestergaard, M., Author
Raimundo, S. I., Author
Bunker, A., Author
Díaz-Santos, T., Author
Gandhi, P., Author
García-Bernete, I., Author
Hicks, E. K. S., Author
Hönig, S. F., Author
Hunt, L. K., Author
Imanishi, M., Author
Izumi, T., Author
Levenson, N. A., Author
Maciejewski, W., Author
Packham, C., Author
Almeida, C. Ramos, Author
Ricci, C., AuthorRigopoulou, D., AuthorRoche, P. F., AuthorRosario, D., AuthorSchartmann, M.2, Author              Usero, A., AuthorWard, M. J., Author more..
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              
2Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159895              

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 Abstract: ALMA observations have revealed nuclear dusty molecular disks or tori with characteristic sizes 15−40 pc in the few Seyferts and low -luminosity AGN that have been studied so far. These structures are generally decoupled both morphologically and kinematically from the host galaxy disk. We present ALMA observations of the CO(2–1) and CO(3–2) molecular gas transitions and associated (sub-) millimeter continua of the nearby Seyfert 1.5 galaxy NGC 3227 with angular resolutions 0.085 − 0.21″ (7–15 pc). On large scales, the cold molecular gas shows circular motions as well as streaming motions on scales of a few hundred parsecs that are associated with a large-scale bar. We fit the nuclear ALMA 1.3 mm emission with an unresolved component and an extended component. The 850 μm emission shows at least two extended components, one along the major axis of the nuclear disk, and the other along the axis of the ionization cone. The molecular gas in the central region (1″ ∼ 73 pc) shows several CO clumps with complex kinematics that appears to be dominated by noncircular motions. While we cannot conclusively demonstrate the presence of a warped nuclear disk, we also detected noncircular motions along the kinematic minor axis. They reach line-of-sight velocities of v − vsys = 150 − 200 km s−1. Assuming that the radial motions are in the plane of the galaxy, we interpret them as a nuclear molecular outflow due to molecular gas in the host galaxy that is entrained by the AGN wind. We derive molecular outflow rates of 5 M⊙ yr−1 and 0.6 M yr−1 at projected distances of up to 30 pc to the northeast and southwest of the AGN, respectively. At the AGN location we estimate a mass in molecular gas of 5 × 105 M and an equivalent average column density N(H2) = 2 − 3 × 1023 cm−2 in the inner 15 pc. The nuclear CO(2–1) and CO(3–2) molecular gas and submillimeter continuum emission of NGC 3227 do not resemble the classical compact torus. Rather, these emissions extend for several tens of parsecs and appear connected with the circumnuclear ring in the host galaxy disk, as found in other local AGN.

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 Dates: 2019-08-08
 Publication Status: Published online
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 Identifiers: DOI: 10.1051/0004-6361/201935431
Other: LOCALID: 3176117
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 628 Sequence Number: A65 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1