AT2021aeuk: A Repeating Partial Tidal Disruption Event Candidate in a Narrow-line Seyfert 1 galaxy
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2025
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| author | Sun, Jingbo Guo, Hengxiao Gu, Minfeng Li, Ya-Ping Chen, Yongjun González-Buitrago, D. Wang, Jian-Guo Li, Sha-Sha Feng, Hai-Cheng Xiong, Dingrong Wang, Yanan Yuan, Qi Jin, Jun-Jie Zhang, Wenda Deng, Hongping Zhang, Minghao |
| author_facet | Sun, Jingbo Guo, Hengxiao Gu, Minfeng Li, Ya-Ping Chen, Yongjun González-Buitrago, D. Wang, Jian-Guo Li, Sha-Sha Feng, Hai-Cheng Xiong, Dingrong Wang, Yanan Yuan, Qi Jin, Jun-Jie Zhang, Wenda Deng, Hongping Zhang, Minghao |
| contents | A black hole (BH) can tear apart a star that ventures within its tidal radius, producing a luminous flare as the stellar debris falls back, known as a tidal disruption event (TDE). While TDEs in quiescent galaxies are relatively well understood, identifying TDEs in active galactic nuclei (AGN) still remains a significant challenge. We present the discovery of AT2021aeuk, a transient exhibiting dual flares within around three years in a narrow-line Seyfert 1 galaxy. Multi-wavelength observations triggered during the second flare in 2023 revealed an extraordinary X-ray V-shaped light curve, strongly anti-correlated with the optical light curve and accompanied by a lag of $\sim$40 days. This behavior is inconsistent with both supernova and pure AGN origins. In addition, a new broad component emerges in the Balmer lines during the second flare, showing a clear reverberation signal to the continuum variation. We propose that the dual-flare may be linked to a repeating partial TDE (rpTDE), where the second flare results from a collision between the TDE stream and the inner accretion disk, triggering an optical flare while simultaneously partially destroying the X-ray corona. However, other mechanisms, such as a stellar-mass BH (sBH) merger within an accretion disk, could produce similar phenomena, which we cannot entirely rule out. The Vera C. Rubin Observatory will be a powerful tool for further investigating the nature of such events in the future. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_01824 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | AT2021aeuk: A Repeating Partial Tidal Disruption Event Candidate in a Narrow-line Seyfert 1 galaxy Sun, Jingbo Guo, Hengxiao Gu, Minfeng Li, Ya-Ping Chen, Yongjun González-Buitrago, D. Wang, Jian-Guo Li, Sha-Sha Feng, Hai-Cheng Xiong, Dingrong Wang, Yanan Yuan, Qi Jin, Jun-Jie Zhang, Wenda Deng, Hongping Zhang, Minghao High Energy Astrophysical Phenomena Astrophysics of Galaxies A black hole (BH) can tear apart a star that ventures within its tidal radius, producing a luminous flare as the stellar debris falls back, known as a tidal disruption event (TDE). While TDEs in quiescent galaxies are relatively well understood, identifying TDEs in active galactic nuclei (AGN) still remains a significant challenge. We present the discovery of AT2021aeuk, a transient exhibiting dual flares within around three years in a narrow-line Seyfert 1 galaxy. Multi-wavelength observations triggered during the second flare in 2023 revealed an extraordinary X-ray V-shaped light curve, strongly anti-correlated with the optical light curve and accompanied by a lag of $\sim$40 days. This behavior is inconsistent with both supernova and pure AGN origins. In addition, a new broad component emerges in the Balmer lines during the second flare, showing a clear reverberation signal to the continuum variation. We propose that the dual-flare may be linked to a repeating partial TDE (rpTDE), where the second flare results from a collision between the TDE stream and the inner accretion disk, triggering an optical flare while simultaneously partially destroying the X-ray corona. However, other mechanisms, such as a stellar-mass BH (sBH) merger within an accretion disk, could produce similar phenomena, which we cannot entirely rule out. The Vera C. Rubin Observatory will be a powerful tool for further investigating the nature of such events in the future. |
| title | AT2021aeuk: A Repeating Partial Tidal Disruption Event Candidate in a Narrow-line Seyfert 1 galaxy |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2501.01824 |