Mrk 382: A Narrow-line Seyfert 1 Galaxy with Recurrent X-Ray State Transitions
9 affiliations
- 1Shenzhen Technology University
- 2Guangzhou University
- 3Institute of High Energy Physics
- 4University of Science and Technology of China
- 5National Astronomical Observatories
- 6Peking University
- 7Nanjing University
- 8Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University)
- 9Anhui Normal University
Abstract
We report recurrent X-ray state transitions in the nearby narrow-line Seyfert 1 galaxy Mrk 382 using multiepoch observations from Swift, Chandra, XMM-Newton, and eROSITA, together with archival ultraviolet (UV), optical, and infrared (IR) data. The 0.3–2 keV flux varies by nearly an order of magnitude over ∼15 yr, with multiple transitions between bright and faint states. The X-ray spectrum shows strong state-dependent evolution, changing from a steep high-state continuum (Γ = 2.32 ± 0.04) to a much harder low-state spectrum (Γ = 1.39 ± 0.06), which also exhibits a narrow Fe K α line with an equivalent width of ∼330 eV. Reflection modeling indicates that the low-flux state is strongly reflection dominated, with the reflection fraction increasing from R refl ∼ 4.4 to ∼30, consistent with substantial changes in the inner disk–corona configuration. Photoionized absorption contributes to the spectral complexity, but its relatively modest column density suggests that absorption alone is unlikely to explain the full amplitude of the X-ray transitions. The UV emission shows possible long-term correspondence with the X-ray variability at smaller amplitude, while the optical and mid-IR bands vary more mildly. The spectral and multiwavelength behavior suggests that changes in coronal geometry may be accompanied by changes in its intrinsic energetics. Despite the dramatic X-ray variability, no extreme X-ray-weak state or clear optical spectral-type change is observed. Mrk 382 therefore provides a valuable nearby laboratory for studying the evolution of the disk–corona system and its connection to multiwavelength active galactic nucleus variability.
Related
- Extreme Multiwavelength Variability in the Recurrent Intermediate-type Changing-look Seyfert Galaxy SDSS J234728.73+242745.7
- Investigating X-ray emission from radio-detected broad- and narrow-line Seyfert 1 galaxies
- Large-Scale Stellar Bars and Nuclear Activity in Narrow-Line Seyfert 1 Galaxies
- Large-scale Stellar Bars and Nuclear Activity in Narrow-line Seyfert 1 Galaxies
- A comparative analysis of the long-term optical variability characteristics of narrow and broad-line Seyfert 1 galaxies at z > 0.8
BibTeX
@article{ai2026narrowline,
title = {{Mrk 382: A Narrow-line Seyfert 1 Galaxy with Recurrent X-Ray State Transitions}},
author = {YanLi Ai and WenFeng Wen and Liming Dou and Jiahua Wu and Chen Hu and Tinggui Wang and XiaoHui Yang and Jing Wang and Xue-Bing Wu and Qiusheng Gu and Xinwen Shu and Pu Du and Jian-Min Wang},
journal = {The Astrophysical Journal},
year = {2026},
month = oct,
doi = {10.3847/1538-4357/aeac1c},
url = {https://iopscience.iop.org/article/10.3847/1538-4357/aeac1c},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Mrk 382: A Narrow-line Seyfert 1 Galaxy with Recurrent X-Ray State Transitions
AU - YanLi Ai
AU - WenFeng Wen
AU - Liming Dou
AU - Jiahua Wu
AU - Chen Hu
AU - Tinggui Wang
AU - XiaoHui Yang
AU - Jing Wang
AU - Xue-Bing Wu
AU - Qiusheng Gu
AU - Xinwen Shu
AU - Pu Du
AU - Jian-Min Wang
PY - 2026
DA - 2026/10/29
JO - The Astrophysical Journal
DO - 10.3847/1538-4357/aeac1c
UR - https://iopscience.iop.org/article/10.3847/1538-4357/aeac1c
AB - We report recurrent X-ray state transitions in the nearby narrow-line Seyfert 1 galaxy Mrk 382 using multiepoch observations from Swift, Chandra, XMM-Newton, and eROSITA, together with archival ultraviolet (UV), optical, and infrared (IR) data. The 0.3–2 keV flux varies by nearly an order of magnitude over ∼15 yr, with multiple transitions between bright and faint states. The X-ray spectrum shows strong state-dependent evolution, changing from a steep high-state continuum (Γ = 2.32 ± 0.04) to a much harder low-state spectrum (Γ = 1.39 ± 0.06), which also exhibits a narrow Fe K α line with an equivalent width of ∼330 eV. Reflection modeling indicates that the low-flux state is strongly reflection dominated, with the reflection fraction increasing from R refl ∼ 4.4 to ∼30, consistent with substantial changes in the inner disk–corona configuration. Photoionized absorption contributes to the spectral complexity, but its relatively modest column density suggests that absorption alone is unlikely to explain the full amplitude of the X-ray transitions. The UV emission shows possible long-term correspondence with the X-ray variability at smaller amplitude, while the optical and mid-IR bands vary more mildly. The spectral and multiwavelength behavior suggests that changes in coronal geometry may be accompanied by changes in its intrinsic energetics. Despite the dramatic X-ray variability, no extreme X-ray-weak state or clear optical spectral-type change is observed. Mrk 382 therefore provides a valuable nearby laboratory for studying the evolution of the disk–corona system and its connection to multiwavelength active galactic nucleus variability.
SN - 1538-4357
SN - 0004-637X
ER -