Friday, July 12, 2013

1307.3032 (K. A. Postnov et al.)

Do we see accreting magnetars in X-ray pulsars?    [PDF]

K. A. Postnov, N. I. Shakura, A. Yu. Kochetkova, L. Hjalmarsdotter
Strong magnetic field of accreting neutron stars ($10^{14}$ G) is hard to probe by X-ray spectroscopy but can be indirectly inferred from spin-up/spin-down measurement in X-ray pulsars. The existing observations of slowly rotating X-ray pulsars are discussed. It is shown that magnetic fields of neutron stars derived from these observations (or lower limits in some cases) fall within the standard $10^{12}$-$10^{13}$ G range. Claims about the evidence for accreting magnetars are critically discussed in the light of recent progress in understanding of accretion onto slowly rotating neutron stars in the subsonic regime.
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