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

G. Vasilopoulos; M. Petropoulou; F. Koliopanos; P. S. Ray; C. D. Bailyn; F. Haberl; K. Gendreau

doi:10.1093/mnras/stz2045

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

High Energy Astrophysical Phenomena 2019-08-14 v2

Authors: G. Vasilopoulos , M. Petropoulou , F. Koliopanos , P. S. Ray , C. D. Bailyn , F. Haberl , K. Gendreau

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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.

Keywords

x-ray pulsar timing x-ray binaries cataclysmic variable orbital periods

Cite

@article{arxiv.1905.03740,
  title  = {NGC 300 ULX1: spin evolution, super-Eddington accretion and outflows},
  author = {G. Vasilopoulos and M. Petropoulou and F. Koliopanos and P. S. Ray and C. D. Bailyn and F. Haberl and K. Gendreau},
  journal= {arXiv preprint arXiv:1905.03740},
  year   = {2019}
}

Comments

7 pages, 3 figures, MNRAS in press

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

Abstract

Keywords

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