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        NuSTAR Observations of Candidate Subparsec Binary Supermassive Black Holes

        Author
        Saade, M. Lynne
        Brightman, Murray
        Stern, Daniel
        Connor, Thomas
        Djorgovski, S. G.
        D’Orazio, Daniel J.
        Ford, K. E. S.
        Graham, Matthew J.
        Haiman, Zoltán
        Jun, Hyunsung D.
        Kammoun, Elias
        Kraft, Ralph P.
        McKernan, Barry
        Vikhlinin, Alexei
        Walton, Dominic J.
        Attention
        2299/27813
        Abstract
        We present an analysis of NuSTAR X-ray observations of three active galactic nuclei (AGN) that were identified as candidate subparsec binary supermassive black hole (SMBH) systems in the Catalina Real-Time Transient Survey based on apparent periodicity in their optical light curves. Simulations predict that close-separation accreting SMBH binaries will have different X-ray spectra than single accreting SMBHs. We previously observed these AGN with Chandra and found no differences between their low-energy X-ray properties and the larger AGN population. However, some models predict differences to be more prominent at energies higher than probed by Chandra. We find that even at the higher energies probed by NuSTAR, the spectra of these AGN are indistinguishable from the larger AGN population. This could rule out models predicting large differences in the X-ray spectra in the NuSTAR bands. Alternatively, it might mean that these three AGN are not binary SMBHs.
        Publication date
        2024-05-01
        Published in
        The Astrophysical Journal
        Published version
        https://doi.org/10.3847/1538-4357/ad372e
        Other links
        http://hdl.handle.net/2299/27813
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