Speaker
Description
Observations with the high spectral resolution XRISM Resolve detector are transforming our understanding our of AGN winds. Here I will present the results a 150 ksec observation of NGC4051, which caught the AGN in a historically bright state. NGC4051 is a bright nearby Narrow Line Seyfert 1, renowned for its rapid X-ray variability and the presence of a multi-phase wind, detected in both the soft X-ray and Fe K bands. The XRISM Resolve mean spectrum revealed two blue-shifted Fe K shell absorption lines, associated with two wind components with outflow velocities of 0.025c and 0.04c. A time-resolved spectral analysis showed that these absorption features are variable on time scales of few tens of ksec; where the slow component is present mainly in the first half of the observation, while the fast one appears in the second part of the observation. Two possible scenarios for the variability will be discussed: separate transiting absorbers with different velocities or an accelerating outflow.