http://arxiv.org/abs/1806.05784
Possible manifestations of accreting magnetars are discussed. It is shown that the four ultra-luminous X-ray pulsars can be understood in the accreting low magnetic field magnetar scenario. The NGC300 ULX1 pulsar may have a higher dipole magnetic field than other sources. This may explain why its has the longest rotational period and largest spin-up rate in the four ULX pulsars. General constraint on their mass accretion rate confirmed their super-Eddington nature. Lower limits on their beaming factor are obtained. They do not seem to have strong beaming. The duty cycle of the ULX burst state can also be constrained by their timing observations. It is proposed that the slowest puslation X-ray pulsar AX J1910.7+0917 may be an accreting magnetar with a low mass accretion rate. ULX pulsars, slow pulsation X-ray pulsars may all be accreting magnetars with different accretion rates. These special accreting neutron stars may be linked together in the accreting magnetar scenario. Seven possible signatures of an accreting magnetar are summarized.
H. Tong and W. Wang
Mon, 18 Jun 18
45/54
Comments: 8 pages, submitted