XRISM finds the Changing-Look AGN NGC 1365 in an extended low state: A dense, highly ionized outflow obscures the central source
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866912800796835840 |
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| author | Zaidouni, Fatima Kara, Erin Kosec, Peter Behar, Ehud Mushotzky, Richard Koss, Michael Juráňová, Anna Kammoun, Elias Brenneman, Laura W. Chakraborty, Joheen Ebisawa, Ken Eckart, Megan E. Fabian, Andrew C. Fukazawa, Yasushi García, Javier A. Gu, Liyi Masterson, Megan Ogawa, Shoji Okajima, Takashi Paltani, Stéphane Rogantini, Daniele Terashima, Yuichi Williams, Brian J. Yamada, Satoshi |
| author_facet | Zaidouni, Fatima Kara, Erin Kosec, Peter Behar, Ehud Mushotzky, Richard Koss, Michael Juráňová, Anna Kammoun, Elias Brenneman, Laura W. Chakraborty, Joheen Ebisawa, Ken Eckart, Megan E. Fabian, Andrew C. Fukazawa, Yasushi García, Javier A. Gu, Liyi Masterson, Megan Ogawa, Shoji Okajima, Takashi Paltani, Stéphane Rogantini, Daniele Terashima, Yuichi Williams, Brian J. Yamada, Satoshi |
| contents | We present the first XRISM/Resolve observations of the active galactic nucleus, NGC 1365, obtained in 2024 February and July. NGC 1365 is known for rapid transitions between Compton-thick and Compton-thin states, along with strong absorption from a highly ionized wind. During our observations, the source is found in a persistent low-flux state, characterized by a decrease in hard-X-ray luminosity and significant line-of-sight obscuration. In this state, XRISM/Resolve reveals clear Fe\,\textsc{xxv} and Fe\,\textsc{xxvi} absorption lines together with, for the first time in this source, corresponding emission lines. These features may arise either from reemission from a photoionized wind (P Cygni profile) or from collisionally ionized gas associated with outflow-driven shocks in the interstellar medium. We estimate the wind launch radius to be approximately $10^{16}~\mathrm{cm}$ ($\sim 10^4 R_{\mathrm{g}}$), consistent with the location of the X-ray broad-line region. We also resolve a broadened Fe K$α$ line by $σ\sim 1300$ km s$^{-1}$ placing it at similar scales to the wind, consistent with radii inferred from disk-broadening models and the variability of the Fe K$α$ broad line. The similarity of the Fe K$α$ profile to the H$β$ wing and broad Pa$α$ width indicates that the X-ray-emitting region is likely cospatial with the optical/IR broad-line region and originates from the same gas. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_00795 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | XRISM finds the Changing-Look AGN NGC 1365 in an extended low state: A dense, highly ionized outflow obscures the central source Zaidouni, Fatima Kara, Erin Kosec, Peter Behar, Ehud Mushotzky, Richard Koss, Michael Juráňová, Anna Kammoun, Elias Brenneman, Laura W. Chakraborty, Joheen Ebisawa, Ken Eckart, Megan E. Fabian, Andrew C. Fukazawa, Yasushi García, Javier A. Gu, Liyi Masterson, Megan Ogawa, Shoji Okajima, Takashi Paltani, Stéphane Rogantini, Daniele Terashima, Yuichi Williams, Brian J. Yamada, Satoshi High Energy Astrophysical Phenomena We present the first XRISM/Resolve observations of the active galactic nucleus, NGC 1365, obtained in 2024 February and July. NGC 1365 is known for rapid transitions between Compton-thick and Compton-thin states, along with strong absorption from a highly ionized wind. During our observations, the source is found in a persistent low-flux state, characterized by a decrease in hard-X-ray luminosity and significant line-of-sight obscuration. In this state, XRISM/Resolve reveals clear Fe\,\textsc{xxv} and Fe\,\textsc{xxvi} absorption lines together with, for the first time in this source, corresponding emission lines. These features may arise either from reemission from a photoionized wind (P Cygni profile) or from collisionally ionized gas associated with outflow-driven shocks in the interstellar medium. We estimate the wind launch radius to be approximately $10^{16}~\mathrm{cm}$ ($\sim 10^4 R_{\mathrm{g}}$), consistent with the location of the X-ray broad-line region. We also resolve a broadened Fe K$α$ line by $σ\sim 1300$ km s$^{-1}$ placing it at similar scales to the wind, consistent with radii inferred from disk-broadening models and the variability of the Fe K$α$ broad line. The similarity of the Fe K$α$ profile to the H$β$ wing and broad Pa$α$ width indicates that the X-ray-emitting region is likely cospatial with the optical/IR broad-line region and originates from the same gas. |
| title | XRISM finds the Changing-Look AGN NGC 1365 in an extended low state: A dense, highly ionized outflow obscures the central source |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2601.00795 |