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Investigating the evolution of the dual AGN system ESO 509-IG066

Investigating the evolution of the dual AGN system ESO 509-IG066
Investigating the evolution of the dual AGN system ESO 509-IG066
We analyze the evolution of the dual active galactic nucleus (AGN) in ESO 509-IG066, a galaxy pair located at z = 0.034 whose nuclei are separated by 11 kpc. Previous observations with XMM-Newton on this dual AGN found evidence for two moderately obscured ({N}{{H}} ˜ 1022 cm-2) X-ray luminous ({L}{{X}} ˜ 1043 erg s-1) nuclear sources. We present an analysis of subsequent Chandra, NuSTAR, and Swift/XRT observations that show one source has dropped in flux by a factor of 10 between 2004 and 2011, which could be explained by either an increase in the absorbing column or an intrinsic fading of the central engine, possibly due to a decrease in mass accretion. Both of these scenarios are predicted by galaxy merger simulations. The source that has dropped in flux is not detected by NuSTAR, which argues against absorption, unless it is extreme. However, new Keck/LRIS optical spectroscopy reveals a previously unreported broad Hα line that is highly unlikely to be visible under the extreme absorption scenario. We therefore conclude that the black hole in this nucleus has undergone a dramatic drop in its accretion rate. From AO-assisted near-infrared integral-field spectroscopy of the other nucleus, we find evidence that the galaxy merger is having a direct effect on the kinematics of the gas close to the nucleus of the galaxy, providing a direct observational link between the galaxy merger and the mass accretion rate onto the black hole.
galaxies: active, galaxies: individual: ESO 509-IG066, galaxies: nuclei, galaxies: Seyfert, X-rays: galaxies
0004-637X
168
Kosec, P.
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Brightman, M.
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Stern, D.
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Müller-Sánchez, F.
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Koss, M.
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Oh, K.
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Assef, R.J.
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Gandhi, P.
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Harrison, F. A.
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Jun, H.
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Masini, A.
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Ricci, C.
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Walton, D. J.
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Treister, E.
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Comerford, J.
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Privon, G.
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Kosec, P.
282f6cb4-884a-44b8-9b36-bdfa792cdd16
Brightman, M.
eb110ae1-9a2c-4968-b9ef-e7955feba535
Stern, D.
a573010b-ca8e-4018-b0f5-4621657713b3
Müller-Sánchez, F.
bdbd8d38-95fd-457b-8737-e438ff096b37
Koss, M.
387f73a9-87d6-4b71-b8ec-c57be5592e92
Oh, K.
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Assef, R.J.
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Gandhi, P.
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Harrison, F. A.
d12bd352-3538-4dac-86fb-f13bc5837016
Jun, H.
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Masini, A.
dec115b8-de67-47e6-ba62-b6cd1f112cd3
Ricci, C.
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Walton, D. J.
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Treister, E.
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Comerford, J.
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Privon, G.
87780509-2451-496a-8731-f555f666c7da

Kosec, P., Brightman, M., Stern, D., Müller-Sánchez, F., Koss, M., Oh, K., Assef, R.J., Gandhi, P., Harrison, F. A., Jun, H., Masini, A., Ricci, C., Walton, D. J., Treister, E., Comerford, J. and Privon, G. (2017) Investigating the evolution of the dual AGN system ESO 509-IG066. The Astrophysical Journal, 850 (2), 168. (doi:10.3847/1538-4357/aa932e).

Record type: Article

Abstract

We analyze the evolution of the dual active galactic nucleus (AGN) in ESO 509-IG066, a galaxy pair located at z = 0.034 whose nuclei are separated by 11 kpc. Previous observations with XMM-Newton on this dual AGN found evidence for two moderately obscured ({N}{{H}} ˜ 1022 cm-2) X-ray luminous ({L}{{X}} ˜ 1043 erg s-1) nuclear sources. We present an analysis of subsequent Chandra, NuSTAR, and Swift/XRT observations that show one source has dropped in flux by a factor of 10 between 2004 and 2011, which could be explained by either an increase in the absorbing column or an intrinsic fading of the central engine, possibly due to a decrease in mass accretion. Both of these scenarios are predicted by galaxy merger simulations. The source that has dropped in flux is not detected by NuSTAR, which argues against absorption, unless it is extreme. However, new Keck/LRIS optical spectroscopy reveals a previously unreported broad Hα line that is highly unlikely to be visible under the extreme absorption scenario. We therefore conclude that the black hole in this nucleus has undergone a dramatic drop in its accretion rate. From AO-assisted near-infrared integral-field spectroscopy of the other nucleus, we find evidence that the galaxy merger is having a direct effect on the kinematics of the gas close to the nucleus of the galaxy, providing a direct observational link between the galaxy merger and the mass accretion rate onto the black hole.

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Accepted/In Press date: 5 October 2017
e-pub ahead of print date: 28 November 2017
Published date: 1 December 2017
Keywords: galaxies: active, galaxies: individual: ESO 509-IG066, galaxies: nuclei, galaxies: Seyfert, X-rays: galaxies

Identifiers

Local EPrints ID: 418618
URI: http://eprints.soton.ac.uk/id/eprint/418618
ISSN: 0004-637X
PURE UUID: a5c56cc0-6959-4456-b9a6-8399ef1c4d7f
ORCID for P. Gandhi: ORCID iD orcid.org/0000-0003-3105-2615

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Date deposited: 12 Mar 2018 17:31
Last modified: 09 Oct 2020 16:36

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Contributors

Author: P. Kosec
Author: M. Brightman
Author: D. Stern
Author: F. Müller-Sánchez
Author: M. Koss
Author: K. Oh
Author: R.J. Assef
Author: P. Gandhi ORCID iD
Author: F. A. Harrison
Author: H. Jun
Author: A. Masini
Author: C. Ricci
Author: D. J. Walton
Author: E. Treister
Author: J. Comerford
Author: G. Privon

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