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X-ray Polarimetry of X-ray Pulsars
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Radiation from X-ray pulsars (XRPs) was expected to be strongly linearly polarized owing to a large difference in their ordinary and extraordinary mode opacities. The launch of IXPE allowed us to check this prediction. IXPE observed a dozen X-ray pulsars, discovering pulse-phase dependent variation of the polarization degree (PD) and polarization angle (PA). Although the PD showed rather erratic profiles resembling flux pulse dependence, the PA in most cases showed smooth variations consistent with the rotating vector model (RVM), which can be interpreted as a combined effect of vacuum birefringence and dipole magnetic field structure at a polarization-limiting (adiabatic) radius. Application of the RVM allowed us to determine XRP geometry and to confirm the free precession of the NS in Her X-1. Deviations from RVM in two bright transients led to the discovery of an unpulsed polarized emission likely produced by scattering off the accretion disk wind.
Forward citations
Cited by 2 Pith papers
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Physics of Strong Magnetism with eXTP
The eXTP mission's planned instruments would enable more sensitive X-ray polarization and timing observations of magnetars and accreting pulsars, potentially testing vacuum birefringence and probing magnetic field structures.
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X-Ray Views of Galactic Accreting Pulsars in High-Mass X-Ray Binaries
A concise review of the timing, spectral, and polarization properties of accreting X-ray pulsars in high-mass X-ray binaries, including recent IXPE results.
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