NGC 300 ULX1: spin evolution, super-Eddington accretion and outflows. (arXiv:1905.03740v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Vasilopoulos_G/0/1/0/all/0/1">G. Vasilopoulos</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Petropoulou_M/0/1/0/all/0/1">M. Petropoulou</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Koliopanos_F/0/1/0/all/0/1">F. Koliopanos</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ray_P/0/1/0/all/0/1">P. S. Ray</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bailyn_C/0/1/0/all/0/1">C. D. Bailyn</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Haberl_F/0/1/0/all/0/1">F. Haberl</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gendreau_K/0/1/0/all/0/1">K. Gendreau</a>
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.
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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