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NuSTAR Resolves the First Dual AGN Above 10 keV in SWIFT J2028.5+2543

Koss, Michael J. and Glidden, Ana and Baloković, Mislav and Stern, Daniel and Lamperti, Isabella and Assef, Roberto and Bauer, Franz E. and Ballantyne, David R. and Boggs, Steven E. and Craig, William W. and Farrah, Duncan and Fürst, Felix and Gandhi, Poshak and Gehrels, Neil and Hailey, Charles J. and Harrison, Fiona A. and Markwardt, Craig and Masini, Alberto and Ricci, Claudio and Treister, Ezequiel and Walton, Dominic J. and Zhang, William W. (2016) NuSTAR Resolves the First Dual AGN Above 10 keV in SWIFT J2028.5+2543. Astrophysical Journal Letters, 824 (1). Art. No. L4. ISSN 2041-8205. doi:10.3847/2041-8205/824/1/L4.

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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′′). NuSTARʼs sensitivity above 10 keV finds both are heavily obscured to Compton-thick levels (NH≈(1–2)×1024cm −2)and contribute equally to the BAT detection (-L10 50 keV int≈ 6 × 10^(42) erg s^(−1)). The observed luminosity of both sources is severely diminished in the 2–10 keV band(< ́--LL 0.1210 keV obs 210keV int), illustrating the importance of >10 keV surveys like those with NuSTAR and Swift / BAT. Compared to rchival 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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Koss, Michael J.0000-0002-7998-9581
Baloković, Mislav0000-0003-0476-6647
Stern, Daniel0000-0003-2686-9241
Lamperti, Isabella0000-0003-3336-5498
Assef, Roberto0000-0002-9508-3667
Bauer, Franz E.0000-0002-8686-8737
Ballantyne, David R.0000-0001-8128-6976
Boggs, Steven E.0000-0001-9567-4224
Farrah, Duncan0000-0003-1748-2010
Fürst, Felix0000-0003-0388-0560
Gandhi, Poshak0000-0003-3105-2615
Harrison, Fiona A.0000-0003-2992-8024
Markwardt, Craig0000-0001-9803-3879
Masini, Alberto0000-0002-7100-9366
Ricci, Claudio0000-0001-5231-2645
Treister, Ezequiel0000-0001-7568-6412
Walton, Dominic J.0000-0001-5819-3552
Zhang, William W.0000-0002-1426-9698
Additional Information:© 2016. The American Astronomical Society. Received 2016 April 4; revised 2016 May 13; accepted 2016 May 13; published 2016 June 3. We acknowledge the Ambizione fellowship grant PZ00P2_154799/1 (MK) and the Joanna Wall Muir and the Caltech Student Faculty Program (AG). This work was supported under NASA Contract No. NNG08FD60C and made use of NuSTAR mission data, a project led by the California Institute of Technology and managed by the Jet Propulsion Laboratory. Facilities: Swift - Swift Gamma-Ray Burst Mission, KPNO:2.1m - , Hale - Palomar Observatory's 5.1m Hale Telescope, NuSTAR - The NuSTAR (Nuclear Spectroscopic Telescope Array) mission, XMM - Newton X-Ray Multimirror Mission satellite, Suzaku - Suzaku (ASTRO-EII).
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Swiss National Science Foundation (SNSF)PZ00P2 154799/1
Subject Keywords:galaxies: active, galaxies: individual, (NGC 6921, MCG+04-48-002), galaxies: interactions, X-rays: galaxie
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2016-07
Issue or Number:1
Record Number:CaltechAUTHORS:20160601-100649101
Persistent URL:
Official Citation:Michael J. Koss et al 2016 ApJ 824 L4
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67533
Deposited By: Deborah Miles
Deposited On:09 Jun 2016 04:24
Last Modified:11 Nov 2021 03:50

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