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Tracing the origin of the AGN fuelling reservoir in MCG–6-30-15

Tracing the origin of the AGN fuelling reservoir in MCG–6-30-15
Tracing the origin of the AGN fuelling reservoir in MCG–6-30-15
The active galaxy MCG–6-30-15 has a 400 pc diameter stellar kinematically distinct core, counter-rotating with respect to the main body of the galaxy. Our previous high spatial resolution (0.1 arcsec) H-band observations of this galaxy mapped the stellar kinematics and [Fe II] 1.64 μm gas dynamics though mainly restricted to the spatial region of the counter-rotating core. In this work, we probe the stellar kinematics on a larger field of view and determine the ionized and molecular gas dynamics to study the formation of the counter-rotating core and the implications for active galactic nucleus (AGN) fuelling. We present integral field spectroscopy observations with SINFONI in the H and K bands in the central 1.2 kpc and with VIMOS HR-blue in the central 4 kpc of the galaxy. Ionized gas outflows of vout ∼ 100 km s−1 are traced by the [Ca VIII] 2.32 μm coronal line and extend out to at least a radius of r ∼ 140 pc. The molecular gas, traced by the H2 2.12 μm emission, is also counter-rotating with respect to the main body of the galaxy, indicating that the formation of the distinct core was associated with inflow of external gas into the centre of MCG–6-30-15. The molecular gas traces the available gas reservoir for AGN fuelling and is detected as close as r ∼ 50–100 pc. External gas accretion is able to significantly replenish the fuelling reservoir suggesting that the event which formed the counter-rotating core was also the main mechanism providing gas for AGN fuelling.
1745-3925
4227–4246
Raimundo, S.I.
e409d9d3-17e8-4049-ad29-43ada60b24e2
Davies, R.I.
36b948e2-f8af-4a85-868a-c61e68c91c7d
Canning, R.E.A.
e8501b04-228c-4eca-b47e-fd2fe344d3ba
Celotti, A.
6c62e9eb-dbb9-4beb-b786-e83aa57a6a63
Fabian, A.C.
0c353376-f159-4129-b03e-d3993c0c5406
Gandhi, P.
5bc3b5af-42b0-4dd8-8f1f-f74048d4d4a9
Raimundo, S.I.
e409d9d3-17e8-4049-ad29-43ada60b24e2
Davies, R.I.
36b948e2-f8af-4a85-868a-c61e68c91c7d
Canning, R.E.A.
e8501b04-228c-4eca-b47e-fd2fe344d3ba
Celotti, A.
6c62e9eb-dbb9-4beb-b786-e83aa57a6a63
Fabian, A.C.
0c353376-f159-4129-b03e-d3993c0c5406
Gandhi, P.
5bc3b5af-42b0-4dd8-8f1f-f74048d4d4a9

Raimundo, S.I., Davies, R.I., Canning, R.E.A., Celotti, A., Fabian, A.C. and Gandhi, P. (2017) Tracing the origin of the AGN fuelling reservoir in MCG–6-30-15. Monthly Notices of the Royal Astronomical Society: Letters, 464 (4), 4227–4246. (doi:10.1093/mnras/stw2635).

Record type: Article

Abstract

The active galaxy MCG–6-30-15 has a 400 pc diameter stellar kinematically distinct core, counter-rotating with respect to the main body of the galaxy. Our previous high spatial resolution (0.1 arcsec) H-band observations of this galaxy mapped the stellar kinematics and [Fe II] 1.64 μm gas dynamics though mainly restricted to the spatial region of the counter-rotating core. In this work, we probe the stellar kinematics on a larger field of view and determine the ionized and molecular gas dynamics to study the formation of the counter-rotating core and the implications for active galactic nucleus (AGN) fuelling. We present integral field spectroscopy observations with SINFONI in the H and K bands in the central 1.2 kpc and with VIMOS HR-blue in the central 4 kpc of the galaxy. Ionized gas outflows of vout ∼ 100 km s−1 are traced by the [Ca VIII] 2.32 μm coronal line and extend out to at least a radius of r ∼ 140 pc. The molecular gas, traced by the H2 2.12 μm emission, is also counter-rotating with respect to the main body of the galaxy, indicating that the formation of the distinct core was associated with inflow of external gas into the centre of MCG–6-30-15. The molecular gas traces the available gas reservoir for AGN fuelling and is detected as close as r ∼ 50–100 pc. External gas accretion is able to significantly replenish the fuelling reservoir suggesting that the event which formed the counter-rotating core was also the main mechanism providing gas for AGN fuelling.

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Poshak Gandhi Tracing the origin of the AGN fuelling reservoir - Accepted Manuscript
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Accepted/In Press date: 11 October 2016
e-pub ahead of print date: 13 October 2016
Published date: February 2017
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 403004
URI: http://eprints.soton.ac.uk/id/eprint/403004
ISSN: 1745-3925
PURE UUID: 7fe742b1-b1dd-4116-9b52-67d65fd11966
ORCID for P. Gandhi: ORCID iD orcid.org/0000-0003-3105-2615

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Date deposited: 21 Nov 2016 16:08
Last modified: 20 Oct 2020 04:01

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