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

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arxiv 1905.03740 v2 pith:NTF73USE submitted 2019-05-09 astro-ph.HE

G. Vasilopoulos , M. Petropoulou , F. Koliopanos , P. S. Ray , C. D. Bailyn , F. Haberl , K. Gendreau This is my paper · ORCID
classification astro-ph.HE
keywords accretionevolutionfluxobservedoutflowsratespinsystem
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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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  1. Discovery of a red supergiant donor star in SN2010da/NGC 300 ULX-1

    astro-ph.HE 2019-09 accept novelty 7.0 of 10

    The donor star of SN2010da/NGC 300 ULX-1 is a red supergiant with effective temperature 3650-3900 K and radius about 310 solar radii, making this the second ULX pulsar with a spectroscopically confirmed supergiant donor.

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