Mrk 382: A Narrow-line Seyfert 1 Galaxy with Recurrent X-ray State Transitions
Abstract
We report recurrent X-ray state transitions in the nearby narrow-line Seyfert~1 galaxy Mrk~382 using multi-epoch observations from \textit{Swift}, \textit{Chandra}, \textit{XMM-Newton}, and eROSITA, together with archival ultraviolet, optical, and infrared data. The 0.3--2 keV flux varies by nearly an order of magnitude over the past ∼15 yr, with multiple transitions between bright and faint states. The source brightened by a factor of ∼10 between the 2010 \textit{Chandra} observation and the 2011 \textit{XMM-Newton} high state, then declined by ∼6--7 to a low state in 2019, followed by renewed brightening in recent \textit{Swift} monitoring. 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). The low-state spectrum also exhibits a narrow Fe Kα 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 Rrefl∼4 to ∼34, consistent with a compact corona subject to strong light-bending effects. The ultraviolet emission broadly follows the long-term X-ray variability but with smaller amplitude, while the optical and mid-infrared bands vary more mildly. Despite the dramatic X-ray variability, Mrk~382 does not enter an extreme X-ray-weak state, and we did not detect clear optical spectral-type changes based on the currently available observations. Mrk~382 is therefore a rare nearby Seyfert galaxy undergoing recurrent X-ray state transitions, providing a valuable laboratory for studying changing coronal geometry and multiwavelength AGN 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
@misc{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 Pudu and Jian-Min Wang},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2606.15674},
eprint = {2606.15674},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.15674},
note = {CC BY 4.0},
}
RIS
TY - UNPB
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 - Pudu
AU - Jian-Min Wang
PY - 2026
DA - 2026/09/20
PB - arXiv
DO - 10.48550/arxiv.2606.15674
UR - https://arxiv.org/abs/2606.15674
AB - We report recurrent X-ray state transitions in the nearby narrow-line Seyfert~1 galaxy Mrk~382 using multi-epoch observations from \textit{Swift}, \textit{Chandra}, \textit{XMM-Newton}, and eROSITA, together with archival ultraviolet, optical, and infrared data. The 0.3--2 keV flux varies by nearly an order of magnitude over the past ∼15 yr, with multiple transitions between bright and faint states. The source brightened by a factor of ∼10 between the 2010 \textit{Chandra} observation and the 2011 \textit{XMM-Newton} high state, then declined by ∼6--7 to a low state in 2019, followed by renewed brightening in recent \textit{Swift} monitoring. 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). The low-state spectrum also exhibits a narrow Fe Kα 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 to ∼34, consistent with a compact corona subject to strong light-bending effects. The ultraviolet emission broadly follows the long-term X-ray variability but with smaller amplitude, while the optical and mid-infrared bands vary more mildly. Despite the dramatic X-ray variability, Mrk~382 does not enter an extreme X-ray-weak state, and we did not detect clear optical spectral-type changes based on the currently available observations. Mrk~382 is therefore a rare nearby Seyfert galaxy undergoing recurrent X-ray state transitions, providing a valuable laboratory for studying changing coronal geometry and multiwavelength AGN variability.
ER -