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X-ray Properties of Radio-Selected Dual Active Galactic Nuclei

Gross, Arran C. and Fu, Hai and Myers, A. D. and Wrobel, J. M. and Djorgovski, S. G. (2019) X-ray Properties of Radio-Selected Dual Active Galactic Nuclei. Astrophysical Journal, 883 (1). Art. No. 50. ISSN 1538-4357. doi:10.3847/1538-4357/ab3795.

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Merger simulations predict that tidally induced gas inflows can trigger kiloparsec-scale dual active galactic nuclei (dAGN) in heavily obscured environments. Previously, with the Very Large Array, we have confirmed four dAGN with redshifts between 0.04 < z < 0.22 and projected separations between 4.3 and 9.2 kpc in the Sloan Digital Sky Survey Stripe 82 field. Here, we present Chandra X-ray observations that spatially resolve these dAGN and compare their multiwavelength properties to those of single AGN from the literature. We detect X-ray emission from six of the individual merger components and obtain upper limits for the remaining two. Combined with previous radio and optical observations, we find that our dAGN have properties similar to nearby low-luminosity AGN, and they agree with the black hole fundamental plane relation well. There are three AGN-dominated X-ray sources, whose X-ray hardness-ratio derived column densities show that two are unobscured and one is obscured. The low obscured fraction suggests these dAGN are no more obscured than single AGN, in contrast to the predictions from simulations. These three sources show an apparent X-ray deficit compared to their mid-infrared continuum and optical [O iii] line luminosities, suggesting higher levels of obscuration, in tension with the hardness-ratio derived column densities. Enhanced mid-infrared and [O iii] luminosities from star formation may explain this deficit. There is ambiguity in the level of obscuration for the remaining five components because their hardness ratios may be affected by nonnuclear X-ray emissions, or are undetected altogether. They require further observations to be fully characterized.

Item Type:Article
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URLURL TypeDescription Paper
Gross, Arran C.0000-0001-7681-9213
Fu, Hai0000-0001-9608-6395
Wrobel, J. M.0000-0001-9720-7398
Djorgovski, S. G.0000-0002-0603-3087
Additional Information:© 2019 The American Astronomical Society. Received 2019 January 28; revised 2019 June 24; accepted 2019 July 30; published 2019 September 19. We thank the anonymous referee for thoughtful comments that helped improve the paper. We thank Philip Kaaret, Cornelia Lang, Joshua Steffen, and Dylan Paré for helpful discussions, and Hua Feng, Claudio Ricci, Shobita Satyapal, and Rui She for providing data from their previous analyses. The scientific results reported in this article are based on observations made by the Chandra X-ray Observatory. Support for this work was provided by the National Aeronautics and Space Administration (NASA) through Chandra Award Number GO7-18084X issued by the Chandra X-ray Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of the National Aeronautics Space Administration under contract NAS8-03060. A.G. and H.F. acknowledge support from the National Science Foundation (NSF) grant AST-1614326. A.D.M. acknowledges support from NSF grant AST-1616168. S.G.D. acknowledges support from NSF grants AST-1413600 and AST-1518308, as well as NASA grant 16-ADAP16-0232. This research has made use of software provided by the Chandra X-ray Center (CXC) in the application packages CIAO, ChIPS, and Sherpa.
Funding AgencyGrant Number
Subject Keywords:galaxies: active – galaxies: interactions – galaxies: nuclei
Issue or Number:1
Record Number:CaltechAUTHORS:20190722-102430761
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Official Citation:Arran C. Gross et al 2019 ApJ 883 50
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97318
Deposited By: Tony Diaz
Deposited On:22 Jul 2019 21:01
Last Modified:16 Nov 2021 17:30

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