Multiple flares and asymmetric broad emission lines in a recurring changing-look active galactic nucleus

We report a case of a changing-look (CL) active galactic nucleus (AGN) at a redshift of z =0.337, identified as J075947.73+112507.3 (hereafter J0759), which exhibits recurring changing-look (RCL) phenomena accompanied by extreme asymmetry in the broad emission-line profiles. J0759 was discovered through the CL-AGN project conducted with the Dark Energy Spectroscopic Instrument. The most recent CL event was confirmed with new spectroscopic observations obtained using the Big Telescope Alt-azimuthal. Variability trends observed in the optical and mid-infrared light curves reveal multiple flares, indicating four to six potential CL events over time. We decomposed the asymmetric broad H α emission line into two components, which persist in both high and low states. The RCL events in J0759 are inconsistent with the obscuration model and are more likely driven by variations in the accretion rate. However, the physical mechanism underlying such rapid accretion-rate changes remains unclear.

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Publication Details

Journal
Astronomy and Astrophysics
Published
2025-05-07
DOI
https://doi.org/10.1051/0004-6361/202452354
Primary Topic
Stellar, planetary, and galactic studies
Type
article
Field-Weighted Citation Impact
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article

Multiple flares and asymmetric broad emission lines in a recurring changing-look active galactic nucleus

Jian‐Min Wang, А. Н. Семена, Marat Musin, А. В. Моисеев et al.
Astronomy and Astrophysics
Stellar, planetary, and galactic studies
article

Multiple flares and asymmetric broad emission lines in a recurring changing-look active galactic nucleus

Jian‐Min Wang, А. Н. Семена, Marat Musin, А. В. Моисеев, C. Ho, Yong-Jie Chen, Suijian Xue, J. Y. Hu, Zhiqiang Chen, Wei-Jian Guo, Sergey Kotov, Kai-Xing Lu, Zhi-Xiang Zhang, Hu Zou, Yan-Rong Li, Huaqing Cheng, Shuo Zhai, Cheng Cheng, A. Victoria Fawcett
article en

Abstract

We report a case of a changing-look (CL) active galactic nucleus (AGN) at a redshift of z =0.337, identified as J075947.73+112507.3 (hereafter J0759), which exhibits recurring changing-look (RCL) phenomena accompanied by extreme asymmetry in the broad emission-line profiles. J0759 was discovered through the CL-AGN project conducted with the Dark Energy Spectroscopic Instrument. The most recent CL event was confirmed with new spectroscopic observations obtained using the Big Telescope Alt-azimuthal. Variability trends observed in the optical and mid-infrared light curves reveal multiple flares, indicating four to six potential CL events over time. We decomposed the asymmetric broad H α emission line into two components, which persist in both high and low states. The RCL events in J0759 are inconsistent with the obscuration model and are more likely driven by variations in the accretion rate. However, the physical mechanism underlying such rapid accretion-rate changes remains unclear.

Astronomy and AstrophysicsVol. 698
Openalex Percentile: Top 93%
Stellar, planetary, and galactic studies
DOIOpen Access PDFOpenAlex
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