X-ray Polarimetry of X-ray Pulsars

被引：6

作者：

Poutanen, Juri ^{[1
]}

Tsygankov, Sergey S. ^{[1
]}

Forsblom, Sofia V. ^{[1
]}

机构：

[1] Univ Turku, Dept Phys & Astron, FI-20014 Turku, Finland

来源：

GALAXIES | 2024年 / 12卷 / 04期

基金：

芬兰科学院;

关键词：

neutron stars; polarization; pulsars; X-ray binaries; STRONGLY-MAGNETIZED PLASMA; NEUTRON-STARS; RADIATIVE-TRANSFER; POLARIZATION; LUMINOSITY; MODELS;

D O I：

10.3390/galaxies12040046

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：14

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