Ultraluminous X-ray pulsar: accreting magnetar?
Abstract
Magnetars are a special kind of neutron stars. There may also be accreting magnetars. From the studies of isolated magnetars, it is known that a neutron star with a strong dipole field only is not a magnetar. Super-slow X-ray pulsars may just be accreting high magnetic field neutron stars. The ultra-luminous X-ray pulsar NuSTAR J095551+6940.8 may be an accreting magnetar. It may be an accreting low magnetic field magnetar with multipole field of 1014 G and dipole field of 1012 G. This point of view is consistent with the study of isolated magnetars. An ultra-luminous X-ray pulsar phase in the binary evolution may result in massive millisecond pulsars.
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