@article {41745,
	title = {NGC 300 ULX1: A test case for accretion torque theory},
	volume = {620},
	year = {2018},
	month = {2018/12/1},
	pages = {L12},
	abstract = {NGC 300 ULX1 is a newly identified ultra-luminous X-ray pulsar. The system is associated with the supernova impostor SN 2010da that was later classified as a possible supergiant Be X-ray binary. In this work we report on the spin period evolution of the neutron star based on all the currently available X-ray observations of the system. We argue that the X-ray luminosity of the system has remained almost constant since 2010, at a level above ten times the Eddington limit. Moreover, we find evidence that the spin period of the neutron star evolved from \~{}126 s down to \~{}18 s within a period of about 4 years. We explain this unprecedented spin evolution in terms of the standard accretion torque theory. An intriguing consequence for NGC 300 ULX1 is that a neutron star spin reversal should have occurred a few years after the SN 2010da event.},
	keywords = {Astrophysics - High Energy Astrophysical Phenomena, galaxies: individual: NGC 300, pulsars: individual: NGC 300 ULX1, stars: neutron, X-rays: binaries},
	isbn = {0004-6361},
	url = {https://ui.adsabs.harvard.edu/abs/2018A\&A...620L..12V},
	author = {Vasilopoulos, G. and Haberl, F. and Carpano, S. and Maitra, C.}
}
