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A Kiloparsec-scale Binary Active Galactic Nucleus Confirmed by the Expanded Very Large Array

Fu, Hai and Zhang, Zhi-Yu and Assef, Roberto J. and Stockton, Alan and Myers, Adam D. and Yan, Lin and Djorgovski, S. G. and Wrobel, J. M. and Riechers, Dominik A. (2011) A Kiloparsec-scale Binary Active Galactic Nucleus Confirmed by the Expanded Very Large Array. Astrophysical Journal Letters, 740 (2). L44. ISSN 2041-8205.

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We report the confirmation of a kiloparsec-scale binary active galactic nucleus (AGN) with high-resolution radio images from the Expanded Very Large Array (EVLA). SDSS J150243.1+111557 is a double-peaked [O III] AGN at z = 0.39 selected from the Sloan Digital Sky Survey. Our previous near-infrared adaptive optics imaging reveals two nuclei separated by 1farcs4 (7.4 kpc), and our optical integral-field spectroscopy suggests that they are a type-1-type-2 AGN pair. However, these data alone cannot rule out the single AGN scenario where the narrow emission-line region associated with the secondary is photoionized by the broad-line AGN in the primary. Our new EVLA images at 1.4, 5.0, and 8.5 GHz show two steep-spectrum compact radio sources spatially coincident with the optical nuclei. The radio power of the type-2 AGN is an order-of-magnitude in excess of star-forming galaxies with similar extinction-corrected [O II] λ3727 luminosities, indicating that the radio emission is powered by accretion. Therefore, SDSS J150243.1+111557 is one of the few confirmed kiloparsec-scale binary AGN systems. Spectral energy distribution modeling shows that SDSS J150243.1+111557 is a merger of two ~10^(11) M sun galaxies. With both black hole masses around 10^8 M_☉, the AGNs are accreting at ~10 times below the Eddington limit.

Item Type:Article
Related URLs:
URLURL TypeDescription
Fu, Hai0000-0001-9608-6395
Zhang, Zhi-Yu0000-0002-7299-2876
Assef, Roberto J.0000-0002-9508-3667
Yan, Lin0000-0003-1710-9339
Djorgovski, S. G.0000-0002-0603-3087
Wrobel, J. M.0000-0001-9720-7398
Riechers, Dominik A.0000-0001-9585-1462
Additional Information:© 2011 American Astronomical Society. Received 2011 August 29; accepted 2011 September 13; published 2011 September 29. Z.Y.Z. acknowledges support by NSFC key project 10833006. A.D.M. is a research fellow of the Alexander von Humboldt Foundation of Germany. A.S. and S.G.D. were partially supported by NSF grants AST-0807900 and AST-0909182, respectively. S.G.D. also acknowledges support by the Ajax Foundation. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Facilities: VLA, Keck:II (LGSAO/NIRC2), UH:2.2m (SNIFS), Sloan
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
National Natural Science Foundation of China10833006
Ajax FoundationUNSPECIFIED
Subject Keywords:galaxies: active; galaxies: individual (SDSS J150243.1+111557); galaxies: interactions; galaxies: nuclei
Issue or Number:2
Record Number:CaltechAUTHORS:20111205-113528709
Persistent URL:
Official Citation:A Kiloparsec-scale Binary Active Galactic Nucleus Confirmed by the Expanded Very Large Array Hai Fu et al. 2011 ApJ 740 L44
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:28297
Deposited By: Jason Perez
Deposited On:06 Dec 2011 20:50
Last Modified:09 Mar 2020 13:19

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