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Hour Timescale X-ray Variability at Super-Eddington Luminosities in a Tidal Disruption Event

Presentation #108.02 in the session Time-domain Astrophysics - Poster Session.

Published onMay 03, 2024
Hour Timescale X-ray Variability at Super-Eddington Luminosities in a Tidal Disruption Event

The last several years have shown that the landscape of tidal disruption event (TDE) accretion is unexpectedly rich and diverse. The discovery of quasi-periodic eruptions (period ~ 10 hr) in TDEs and the fast variability seen in the changing-look active galactic nuclei 1ES 1927+654 are genuine new phenomena of nuclear transients, sparking numerous theoretical inquiries. This frontier of black hole accretion recently witnessed the discovery of AT2022lri, a TDE with hour-timescale large-amplitude non-periodic soft X-ray variability atop a power-law decay, as unveiled through our extensive NICER, Swift, and XMM observations over the past 1.5 year totaling more than 1 Ms. In this talk, we report the discovery and our multi-wavelength observations of AT2022lri. We highlight the evolution of the X-ray thermal and non-thermal components, as well as novel spectral features in the 0.3-2 keV X-ray band. We discuss the physical origin of its spectral properties and rapid X-ray variability.

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