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An accreting low magnetic field magnetar for the ultraluminous X-ray source in M82

One ultraluminous X-ray source in M82 is identified as an accreting neutron star recently (named as NuSTAR J095551+6940.8). It has a super-Eddington luminosity and is spinning up. For an aged magnetar, it is more likely to be a low magnetic field magnetar. An accreting low magnetic field magnetar may explain both the super-Eddington luminosity and the rotational behavior of this source. Considering the effect of beaming, the spin-up rate is understandable using the traditional form of accretion torque. The transient nature, spectral properties of M82 X-2 are discussed. The theoretical period range of accreting magnetar is provided. Three observational appearances of accreting magnetars are summarized.

preprint2015arXivOpen access
H. Tong
astro-ph.HE
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H. Tong

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