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| Format: | Preprint |
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2026
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| Online-Zugang: | https://arxiv.org/abs/2604.11874 |
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| _version_ | 1866915997172105216 |
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| author | Gursahani, Yash A. Liu, Tingting Mushotzky, Richard Reynolds, Christopher S. Koss, Michael |
| author_facet | Gursahani, Yash A. Liu, Tingting Mushotzky, Richard Reynolds, Christopher S. Koss, Michael |
| contents | We investigate the possibility of a binary supermassive black hole system at the center of MCG+11--11--032, a local (z = 0.036) Seyfert 2 galaxy. Prior work with stacked Swift/XRT spectra suggested the presence of two Fe K$α$ lines (at 6.16 keV and 6.56 keV) with 2$σ$ confidence. This could be consistent with a prediction of several hydrodynamical models, in which each black hole hosts a mini-disk and contributes one Doppler-shifted Fe K$α$ line to the total spectrum. Another study using a single exposure from Chandra/ACIS did not find evidence for a double line. Here, we conduct follow-up with two epochs of XMM-Newton/EPIC data spaced $\sim$6 months apart. After fitting our spectra with models from the previous two studies, we do not find evidence for a double iron line in either observation. Our best-fit model yields $Γ= 1.63^{+0.20}_{-0.21}$ and $N_\text{H}/10^{22} \text{ cm}^{-2} = 17.9^{+2.7}_{-2.4}$ for the first epoch, and $Γ= 1.46^{+0.22}_{-0.24}$ and $N_\text{H}/10^{22} \text{ cm}^{-2} = 17.1^{+2.7}_{-2.4}$ for the second. We compare our spectral parameters with those derived in past work on this source, finding broad agreement with prior datasets. Lastly, we discuss the properties of MCG+11--11--032 alongside samples of Seyfert 2 galaxies from the literature, finding that it is consistent with this population and the single AGN scenario. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_11874 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | An XMM-Newton Analysis of the Supermassive Black Hole Binary Candidate MCG+11--11--032 Gursahani, Yash A. Liu, Tingting Mushotzky, Richard Reynolds, Christopher S. Koss, Michael High Energy Astrophysical Phenomena We investigate the possibility of a binary supermassive black hole system at the center of MCG+11--11--032, a local (z = 0.036) Seyfert 2 galaxy. Prior work with stacked Swift/XRT spectra suggested the presence of two Fe K$α$ lines (at 6.16 keV and 6.56 keV) with 2$σ$ confidence. This could be consistent with a prediction of several hydrodynamical models, in which each black hole hosts a mini-disk and contributes one Doppler-shifted Fe K$α$ line to the total spectrum. Another study using a single exposure from Chandra/ACIS did not find evidence for a double line. Here, we conduct follow-up with two epochs of XMM-Newton/EPIC data spaced $\sim$6 months apart. After fitting our spectra with models from the previous two studies, we do not find evidence for a double iron line in either observation. Our best-fit model yields $Γ= 1.63^{+0.20}_{-0.21}$ and $N_\text{H}/10^{22} \text{ cm}^{-2} = 17.9^{+2.7}_{-2.4}$ for the first epoch, and $Γ= 1.46^{+0.22}_{-0.24}$ and $N_\text{H}/10^{22} \text{ cm}^{-2} = 17.1^{+2.7}_{-2.4}$ for the second. We compare our spectral parameters with those derived in past work on this source, finding broad agreement with prior datasets. Lastly, we discuss the properties of MCG+11--11--032 alongside samples of Seyfert 2 galaxies from the literature, finding that it is consistent with this population and the single AGN scenario. |
| title | An XMM-Newton Analysis of the Supermassive Black Hole Binary Candidate MCG+11--11--032 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2604.11874 |