IC 3599's third factor>100 supersoft X-ray outburst, with candidate hours-scale QPO-like variability and dramatically brightened coronal lines, eliminates constant-interval models and supports radiation-pressure disk instability with variable onset.
X-RAY OUTBURST OF THE PECULIAR SEYFERT GALAXY IC 3599
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abstract
We report optical, soft X-ray, and UV observations of the peculiar Seyfert galaxy IC 3599 using data obtained with ROSAT and IUE. Most remarkably, we discovered a rapid decrease of the X-ray flux by a factor of about 100 within one year and a more gradual decrease thereafter. The X-ray spectrum of IC 3599 was soft at flux maximum and became even softer as the flux decreased. Simultaneously with the late decrease of the X-ray flux, we observed a decrease in the strength of highly ionized optical iron lines. We discuss several explanations for this behaviour including an accretion disk instability and tidal disruption of a star orbiting a central massive black hole.
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In the Eye of the Storm: The Third Giant X-ray Outburst of the Extreme Changing-look AGN IC 3599
IC 3599's third factor>100 supersoft X-ray outburst, with candidate hours-scale QPO-like variability and dramatically brightened coronal lines, eliminates constant-interval models and supports radiation-pressure disk instability with variable onset.