NuSTAR Observations of Candidate Subparsec Binary Supermassive Black Holes
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866909153230848000 |
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| 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, Zoltan Jun, Hyunsung D. Kammoun, Elias Kraft, Ralph P. McKernan, Barry Vikhlinin, Alexei Walton, Dominic J. |
| author_facet | Saade, M. Lynne Brightman, Murray Stern, Daniel Connor, Thomas Djorgovski, S. G. D'Orazio, Daniel J. Ford, K. E. S. Graham, Matthew J. Haiman, Zoltan Jun, Hyunsung D. Kammoun, Elias Kraft, Ralph P. McKernan, Barry Vikhlinin, Alexei Walton, Dominic J. |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2304_06144 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | NuSTAR Observations of Candidate Subparsec Binary Supermassive Black Holes Saade, M. Lynne Brightman, Murray Stern, Daniel Connor, Thomas Djorgovski, S. G. D'Orazio, Daniel J. Ford, K. E. S. Graham, Matthew J. Haiman, Zoltan Jun, Hyunsung D. Kammoun, Elias Kraft, Ralph P. McKernan, Barry Vikhlinin, Alexei Walton, Dominic J. High Energy Astrophysical Phenomena Astrophysics of Galaxies 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. |
| title | NuSTAR Observations of Candidate Subparsec Binary Supermassive Black Holes |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2304.06144 |