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NuSTAR resolves the first dual AGN above 10 keV in SWIFT J2028.5+2543

NuSTAR resolves the first dual AGN above 10 keV in SWIFT J2028.5+2543
NuSTAR resolves the first dual AGN above 10 keV in SWIFT J2028.5+2543
We have discovered heavy obscuration in the dual active galactic nucleus (AGN) in the Swift/Burst Alert Telescope (BAT) source SWIFT J2028.5+2543 using Nuclear Spectroscopic Telescope Array (NuSTAR). While an early XMM-Newton study suggested the emission was mainly from NGC 6921, the superior spatial resolution of NuSTAR above 10 keV resolves the Swift/BAT emission into two sources associated with the nearby galaxies MCG +04-48-002 and NGC 6921 (z = 0.014) with a projected separation of 25.3 kpc (91"). NuSTAR's sensitivity above 10 keV finds both are heavily obscured to Compton-thick levels (NH ~ (1–2) × 1024 cm-2) and contribute equally to the BAT detection (Lint10-50 keV ~ 6 × 1042 erg s-1). The observed luminosity of both sources is severely diminished in the 2–10 keV band (Lobs2-10 keV < 0.1 x Lint2-10 keV  ), illustrating the importance of >10 keV surveys like those with NuSTAR and Swift/BAT. Compared to archival X-ray data, MCG +04-48-002 shows significant variability (>3) between observations. Despite being bright X-ray AGNs, they are difficult to detect using optical emission-line diagnostics because MCG +04-48-002 is identified as a starburst/composite because of the high rates of star formation from a luminous infrared galaxy while NGC 6921 is only classified as a LINER using line detection limits. SWIFT J2028.5+2543 is the first dual AGN resolved above 10 keV and is the second most heavily obscured dual AGN discovered to date in the X-rays other than NGC 6240.
2041-8205
1-7
Koss, Michael J.
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Glidden, Ana
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Baloković, Mislav
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Stern, Daniel
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Lamperti, Isabella
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Assef, Roberto
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Bauer, Franz
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Ballantyne, David
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Boggs, Steven E.
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Craig, William W.
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Farrah, Duncan
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Fürst, Felix
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Gandhi, Poshak
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Gehrels, Neil
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Hailey, Charles J.
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Harrison, Fiona A.
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Markwardt, Craig
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Masini, Alberto
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Ricci, Claudio
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Treister, Ezequiel
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Walton, Dominic J.
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Zhang, William W.
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Koss, Michael J.
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Glidden, Ana
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Baloković, Mislav
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Stern, Daniel
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Lamperti, Isabella
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Assef, Roberto
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Bauer, Franz
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Ballantyne, David
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Boggs, Steven E.
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Craig, William W.
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Farrah, Duncan
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Fürst, Felix
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Gandhi, Poshak
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Gehrels, Neil
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Hailey, Charles J.
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Harrison, Fiona A.
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Markwardt, Craig
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Masini, Alberto
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Ricci, Claudio
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Treister, Ezequiel
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Walton, Dominic J.
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Zhang, William W.
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Koss, Michael J., Glidden, Ana, Baloković, Mislav, Stern, Daniel, Lamperti, Isabella, Assef, Roberto, Bauer, Franz, Ballantyne, David, Boggs, Steven E., Craig, William W., Farrah, Duncan, Fürst, Felix, Gandhi, Poshak, Gehrels, Neil, Hailey, Charles J., Harrison, Fiona A., Markwardt, Craig, Masini, Alberto, Ricci, Claudio, Treister, Ezequiel, Walton, Dominic J. and Zhang, William W. (2016) NuSTAR resolves the first dual AGN above 10 keV in SWIFT J2028.5+2543. The Astrophysical Journal Letters, 824 (1), 1-7. (doi:10.3847/2041-8205/824/1/L4).

Record type: Article

Abstract

We have discovered heavy obscuration in the dual active galactic nucleus (AGN) in the Swift/Burst Alert Telescope (BAT) source SWIFT J2028.5+2543 using Nuclear Spectroscopic Telescope Array (NuSTAR). While an early XMM-Newton study suggested the emission was mainly from NGC 6921, the superior spatial resolution of NuSTAR above 10 keV resolves the Swift/BAT emission into two sources associated with the nearby galaxies MCG +04-48-002 and NGC 6921 (z = 0.014) with a projected separation of 25.3 kpc (91"). NuSTAR's sensitivity above 10 keV finds both are heavily obscured to Compton-thick levels (NH ~ (1–2) × 1024 cm-2) and contribute equally to the BAT detection (Lint10-50 keV ~ 6 × 1042 erg s-1). The observed luminosity of both sources is severely diminished in the 2–10 keV band (Lobs2-10 keV < 0.1 x Lint2-10 keV  ), illustrating the importance of >10 keV surveys like those with NuSTAR and Swift/BAT. Compared to archival X-ray data, MCG +04-48-002 shows significant variability (>3) between observations. Despite being bright X-ray AGNs, they are difficult to detect using optical emission-line diagnostics because MCG +04-48-002 is identified as a starburst/composite because of the high rates of star formation from a luminous infrared galaxy while NGC 6921 is only classified as a LINER using line detection limits. SWIFT J2028.5+2543 is the first dual AGN resolved above 10 keV and is the second most heavily obscured dual AGN discovered to date in the X-rays other than NGC 6240.

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Accepted/In Press date: 13 May 2016
e-pub ahead of print date: 2 June 2016
Published date: 3 June 2016
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 399892
URI: http://eprints.soton.ac.uk/id/eprint/399892
ISSN: 2041-8205
PURE UUID: e7d0ab03-f39d-4529-ab1c-08de485bbd7f
ORCID for Poshak Gandhi: ORCID iD orcid.org/0000-0003-3105-2615

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Date deposited: 02 Sep 2016 10:29
Last modified: 17 Dec 2019 01:34

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Contributors

Author: Michael J. Koss
Author: Ana Glidden
Author: Mislav Baloković
Author: Daniel Stern
Author: Isabella Lamperti
Author: Roberto Assef
Author: Franz Bauer
Author: David Ballantyne
Author: Steven E. Boggs
Author: William W. Craig
Author: Duncan Farrah
Author: Felix Fürst
Author: Poshak Gandhi ORCID iD
Author: Neil Gehrels
Author: Charles J. Hailey
Author: Fiona A. Harrison
Author: Craig Markwardt
Author: Alberto Masini
Author: Claudio Ricci
Author: Ezequiel Treister
Author: Dominic J. Walton
Author: William W. Zhang

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