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Lookup NU author(s): Dr Vicky FawcettORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© The Authors 2025. 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 Hα 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.
Author(s): Guo W-J, Zhang Z-X, Moiseev A, Fawcett VA, Chen Y-J, Liu J-R, Musin M, Kotov S, Semena A, Cheng H, Hu J, Zhai S, Chen Z-Q, Cheng C, Li Y-R, Lu K-X, Zou H, Ho LC, Wang J-M, Xue S
Publication type: Article
Publication status: Published
Journal: Astronomy and Astrophysics
Year: 2025
Volume: 698
Online publication date: 11/06/2025
Acceptance date: 02/05/2025
Date deposited: 26/06/2025
ISSN (print): 0004-6361
ISSN (electronic): 1432-0746
Publisher: EDP Sciences
URL: https://doi.org/10.1051/0004-6361/202452354
DOI: 10.1051/0004-6361/202452354
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