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The ultraluminous state revisited: fractional variability and spectral shape as diagnostics of super-Eddington accretion
Although we are nearing a consensus that most ULXs are stellar-mass black holes in a super-Eddington state, little is yet established of the physics of this accretion mode. Here, we use a combined X-ray spectral and timing analysis of a sample of ULXs to investigate this new accretion regime. We …