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 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20111205-113528709
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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.
|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|
|Subject Keywords:||galaxies: active; galaxies: individual (SDSS J150243.1+111557); galaxies: interactions; galaxies: nuclei|
|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.|
|Deposited By:||Jason Perez|
|Deposited On:||06 Dec 2011 20:50|
|Last Modified:||26 Dec 2012 14:34|
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