University of Oulu

Comerón, S., Knapen, J. H., Ramos Almeida, C., & Watkins, A. E. (2021). The complex multi-component outflow of the Seyfert galaxy NGC 7130. Astronomy & Astrophysics, 645, A130. https://doi.org/10.1051/0004-6361/202039382

The complex multi-component outflow of the Seyfert galaxy NGC 7130

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Author: Comerón, S.1,2,3; Knapen, J. H.2,1; Almeida, C. Ramos2,1;
Organizations: 1Departamento de Astrofísica, Universidad de La Laguna, 38200 La Laguna, Tenerife, Spain
2Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain
3Space Science and Astronomy, University of Oulu, PO Box 3000, 90014 Oulu, Finland
4Astrophysics Research Institute, Liverpool John Moores University, IC2, Liverpool Science Park, 146 Brownlow Hill, Liverpool L3 5RF, UK
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.8 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2021090245026
Language: English
Published: EDP Sciences, 2021
Publish Date: 2021-09-02
Description:

Abstract

Active galactic nuclei (AGN) are a key ingredient for understanding galactic evolution, as their activity is coupled to the host galaxy properties through feedback processes. AGN-driven outflows are one of the manifestations of this feedback. The laser guide star adaptive optics mode for MUSE at the VLT now permits us to study the innermost tens of parsecs of nearby AGN in the optical. We present a detailed analysis of the ionised gas in the central regions of NGC 7130, which is an archetypical composite Seyfert and nuclear starburst galaxy at a distance of 64.8 Mpc. We achieve an angular resolution of 0.​​″17, corresponding to roughly 50 pc. We performed a multi-component analysis of the main interstellar medium emission lines in the wavelength range of MUSE and identified nine kinematic components, six of which correspond to the AGN outflow. The outflow is biconic, oriented in an almost north–south direction, and has velocities of a few 100 km s⁻¹ with respect to the disc of NGC 7130. The lobe length is at least 3″(∼900 pc). We decomposed the approaching side of the outflow into a broad and a narrow component with typical velocity dispersions below and above ∼200 km s⁻¹, respectively. The blueshifted narrow nomponent has a sub-structure, in particular a collimated plume traced especially well by [O III]. The plume is aligned with the radio jet, indicating that it may be jet powered. The redshifted lobe is composed of two narrow components and a broad component. An additional redshifted component is seen outside the main north-south axis, about an arcsecond east of the nucleus. Line ratio diagnostics indicate that the outflow gas in the north–south axis is AGN powered, whereas the off-axis component has LINER properties. We hypothesise that this is because the radiation field that reaches off-axis clouds has been filtered by clumpy ionised clouds found between the central engine and the low-ionisation emitting region. If we account for all the outflow components (the blueshifted components), the ionised gas mass outflow rate is Ṁ = 1.5 ± 0.9 M yr⁻¹ (Ṁ = 0.55 ± 0.55 M yr⁻¹), and the kinetic power of the AGN is Ėkin = (3.4 ± 2.5) × 10⁴¹ erg s⁻¹ (Ėkin = (8.8 ± 5.9) × 10⁴⁰ erg s⁻¹), which corresponds to Fkin = 0.15 ± 0.11% (Fkin = 0.040 ± 0.027%) of the bolometric AGN power. The broad components, those with a velocity dispersion of σ >  200 km s⁻¹, carry ∼2/3 (∼90%) of the mass outflow, and ∼90% (∼98%) of the kinetic power. The combination of high-angular-resolution integral field spectroscopy and a careful multi-component decomposition allows a uniquely detailed view of the outflow in NGC 7130, illustrating that AGN kinematics are more complex than those traditionally derived from less sophisticated data and analyses.

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Series: Astronomy and astrophysics
ISSN: 0004-6361
ISSN-E: 1432-0746
ISSN-L: 0004-6361
Volume: 645
Article number: A130
DOI: 10.1051/0004-6361/202039382
OADOI: https://oadoi.org/10.1051/0004-6361/202039382
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Subjects:
Funding: J.H.K. acknowledges financial support from the European Union’s Horizon 2020 research and innovation programme under Marie Skłodowska-Curie grant agreement No 721463 to the SUNDIAL ITN network, from the State Research Agency (AEI-MCINN) of the Spanish Ministry of Science and Innovation under the grant ‘The structure and evolution of galaxies and their central regions’ with reference PID2019-105602GB-I00/10.13039/501100011033, and from IAC project P/300724, financed by the Ministry of Science and Innovation, through the State Budget and by the Canary Islands Department of Economy, Knowledge and Employment, through the Regional Budget of the Autonomous Community. C.R.A. acknowledges financial support from the Spanish Ministry of Science, Innovation and Universities (MCIU) under grant with reference RYC-2014-15779, from the European Union’s Horizon 2020 research and innovation programme under Marie Skłodowska-Curie grant agreement No 860744 (BID4BEST), from the State Research Agency (AEI-MCINN) of the Spanish MCIU under grants ‘Feeding and feedback in active galaxies’ with reference PID2019-106027GB-C42, ‘Feeding, feedback and obscuration in active galaxies’ with reference AYA2016-76682-C3-2-P, and from IAC project P/301404, financed by the Ministry of Science and Innovation, through the State Budget and by the Canary Islands Department of Economy, Knowledge and Employment, through the Regional Budget of the Autonomous Community.
EU Grant Number: (721463) SUNDIAL - SUrvey Network for Deep Imaging Analysis and Learning
Copyright information: © ESO 2021.