Kavli Affiliate: Erin Kara
| Summary:
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,textscxxv and Fe,textscxxvi 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 $10^16~mathrmcm$ ($sim 10^4 R_mathrmg$), consistent with the location of the X-ray broad-line region. We also resolve a broadened Fe K$α$ line by $σsim 1300$ 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.
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