X-ray Polarimetry of X-ray Pulsars

被引:3
|
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
收藏
页数:14
相关论文
共 50 条
  • [1] The X-ray properties of Be/X-ray pulsars in quiescence
    Tsygankov, Sergey S.
    Wijnands, Rudy
    Lutovinov, Alexander A.
    Degenaar, Nathalie
    Poutanen, Juri
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2017, 470 (01) : 126 - 141
  • [2] Spectral analysis of ultraluminous X-ray pulsars with models of X-ray pulsars
    Kumar, Manish
    Sharma, Rahul
    Paul, Biswajit
    Rana, Vikram
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2024, 536 (01) : 340 - 349
  • [3] Hard X-ray spectra of anomalous X-ray pulsars
    Wang, W.
    ASTROPHYSICS OF COMPACT OBJECTS, 2007, 968 : 101 - 103
  • [4] Characterization of X-ray Detectors in the MIT X-ray Polarimetry Beamline
    Heine, Sarah N. T.
    Marshall, Herman L.
    Schneider, Benjamin
    LaMarr, Beverly
    Kothnur, Nithya
    Garner, Alan
    X-RAY, OPTICAL, AND INFRARED DETECTORS FOR ASTRONOMY XI, 2024, 13103
  • [5] The quiescent X-ray emission of three transient X-ray pulsars
    Campana, S
    Stella, L
    Israel, GL
    Moretti, A
    Parmar, AN
    Orlandini, M
    ASTROPHYSICAL JOURNAL, 2002, 580 (01): : 389 - 393
  • [6] Hard X-ray tails and cyclotron features in X-ray pulsars
    Orlandini, M
    Dal Fiume, D
    X-RAY ASTRONOMY: STELLAR ENDPOINTS, AGN, AND THE DIFFUSE X-RAY BACKGROUND, 2001, 599 : 283 - 294
  • [7] X-ray polarimetry an 'almost' new frontier for X-ray astronomy
    Soffitta, P
    VULCANO WORKSHOP 1996 - FRONTIER OBJECTS IN ASTROPHYSICS AND PARTICLE PHYSICS, 1997, 57 : 561 - 573
  • [8] STELLAR X-RAY POLARIMETRY
    MANZO, G
    NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA C-GEOPHYSICS AND SPACE PHYSICS, 1993, 16 (06): : 753 - 767
  • [9] BINARY X-RAY PULSARS
    RAPPAPORT, S
    JOSS, PC
    NATURE, 1977, 266 (5598) : 123 - 125
  • [10] X-RAY POLARIMETRY IN ASTRONOMY
    PRINGLE, JE
    NATURE, 1975, 256 (5518) : 536 - 537