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Unveiling the disc structure in ultraluminous X-ray source NGC 55 ULX-1
(2022-11-01)
Despite two decades of studies, it is still not clear whether ULX spectral transitions are due to stochastic variability in the wind or variations in the accretion rate or in the source geometry. The compact object is also ...
Long-term pulse period evolution of the ultra-luminous X-ray pulsar NGC 7793 P13
(2021-07-16)
Ultra-luminous X-ray pulsars (ULXPs) provide a unique opportunity to study super-Eddington accretion. We present the results of a monitoring campaign of ULXP NGC 7793 P13. Over our four-year monitoring campaign with Swift, ...