NGC 300 ULX1: spin evolution, super-Eddington accretion and outflows

Abstract : NGC300 ULX1 is an ultra-luminous X-ray pulsar, showing an unprecedented spin evolution, from about 126 s to less than 20 s in only 4 years, consistent with steady mass accretion rate. Following its discovery we have been monitoring the system with Swift/XRT and NICER to further study its properties. We found that even though the observed flux of the system dropped by a factor of $\gtrsim$20, the spin-up rate remained almost constant. A possible explanation is that the decrease in the observed flux is a result of increased absorption of obscuring material due to outflows or a precessing accretion disk.
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Submitted on : Thursday, August 8, 2019 - 12:11:54 AM
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G. Vasilopoulos, M. Petropoulou, F. Koliopanos, P.S. Ray, C.D. Bailyn, et al.. NGC 300 ULX1: spin evolution, super-Eddington accretion and outflows. 2019. ⟨hal-02264953⟩



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