NuSTAR Observations of Candidate Subparsec Binary Supermassive Black Holes
arxiv(2023)
摘要
We present analysis of NuSTAR X-ray observations of three 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.
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