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Tidal disruptions of supermassive black hole binaries in galaxy mergers
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- Journal:
- Proceedings of the International Astronomical Union / Volume 21 / Issue S398 / September 2025
- Published online by Cambridge University Press:
- 15 October 2026, pp. 99-109
- Print publication:
- September 2025
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- Article
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Galaxy mergers are the direct descendants of the
$\Lambda$ cold dark matter cosmology. Supermassive black holes (SMBHs) play very important roles in the formation and evolution of galaxies. During the merging of galaxies, the dramatic dynamical evolution results in the very complicated evolution of SMBHs and stars. It is very difficult to find clues of these systems in quiescent galaxies. However, a tidal disruption event (TDE) can temporarily light up the SMBH. TDEs by SMBHBs should be significantly different from the cases with single SMBHs. By using direct 
$\textit{N}$-body simulations and scattering experiments, we investigate TDEs by SMBHBs and find that both the statistical event rates and specific light curves from SMBHB systems are significantly different from the cases in isolated galaxies. This demonstrates that TDEs can serve as a reliable probe to aid in the study of SMBHB formation and evolution.
