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<p>Tidal disruption events (TDEs) occur when a star crosses the tidal radius of a black hole (BH) and is ripped apart, providing a powerful way to probe dormant BHs over a wide mass range. In this study, we present our late-time observations and comprehensive multi-wavelength analyses of AT 2018cqh, a TDE at the center of a dwarf galaxy that exhibited successive flares in the optical, X-ray, and radio bands. We discovered an unexpected high-state X-ray plateau phase following the peak until the present time. Along with its reported prolonged rise lasting at least 550 days, these unique characteristics are consistent with the scenario of a TDE caused by an intermediate-mass black hole (IMBH) with a mass of approximately (1&#xa0;−&#xa0;6)&#xa0;×&#xa0;10<sup>5</sup> solar masses. Furthermore, scaling relations derived from the host-galaxy properties indicated a similar BH mass in concert. This discovery highlights the invaluable role of TDEs in the search for elusive IMBHs.</p>

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A tidal disruption event from an intermediate-mass black hole revealed by comprehensive multi-wavelength observations

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月24日

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  • Jialai Wang,
  • Mengqiu Huang,
  • Yongquan Xue,
  • Ning Jiang,
  • Shifeng Huang,
  • Yibo Wang,
  • Jiazheng Zhu,
  • Shifu Zhu,
  • Lixin Dai,
  • Chichuan Jin,
  • Bin Luo,
  • Xinwen Shu,
  • Mouyuan Sun,
  • Tinggui Wang,
  • Fan Zou

摘要

Tidal disruption events (TDEs) occur when a star crosses the tidal radius of a black hole (BH) and is ripped apart, providing a powerful way to probe dormant BHs over a wide mass range. In this study, we present our late-time observations and comprehensive multi-wavelength analyses of AT 2018cqh, a TDE at the center of a dwarf galaxy that exhibited successive flares in the optical, X-ray, and radio bands. We discovered an unexpected high-state X-ray plateau phase following the peak until the present time. Along with its reported prolonged rise lasting at least 550 days, these unique characteristics are consistent with the scenario of a TDE caused by an intermediate-mass black hole (IMBH) with a mass of approximately (1 − 6) × 105 solar masses. Furthermore, scaling relations derived from the host-galaxy properties indicated a similar BH mass in concert. This discovery highlights the invaluable role of TDEs in the search for elusive IMBHs.