来自磁星源的 X 射线极化

IF 3.2 Q2 ASTRONOMY & ASTROPHYSICS
Galaxies Pub Date : 2024-02-08 DOI:10.3390/galaxies12010006
Roberto Taverna , Roberto Turolla 
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引用次数: 0

摘要

2021 年底发射的 IXPE 望远镜终于使 2-8keV 波段的偏振测量成为现实,这距离 OSO-8 卫星的开创性观测已经过去了 40 多年。在运行的头两年,IXPE 瞄准了 60 多个天体,其中包括四颗磁星,即磁场在 petaGauss 范围内的中子星。在本文中,我们总结了 IXPE 的主要发现,并讨论了它们对超磁化中子星物理学的影响。极化观测证实了理论预测,根据该预测,来自磁星源的X射线辐射具有高度极化,极化程度高达≈80%,是迄今为止探测到的最高值。这独立地证实了磁星确实具有超强磁场,扭曲磁层情景是其软X射线辐射最可能的解释。偏振测量使我们能够探测恒星最外层的物理条件,显示较冷的表面区域处于凝结状态,顶部没有大气。虽然没有发现真空 QED 效应的烟枪,但偏振角的相位依赖行为强烈暗示真空双折射确实在磁星磁层中起作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
X-ray Polarization from Magnetar Sources
The launch of the IXPE telescope in late 2021 finally made polarization measurements in the 2–8keV band a reality, more than 40 years after the pioneering observations of the OSO-8 satellite. In the first two years of operations, IXPE targeted more than 60 sources, including four magnetars, neutron stars with magnetic fields in the petaGauss range. In this paper we summarize the IXPE main findings and discuss their implications for the physics of ultra-magnetized neutron stars. Polarimetric observations confirmed theoretical predictions, according to which X-ray radiation from magnetar sources is highly polarized, up to ≈80%, the highest value detected so far. This provides an independent confirmation that magnetars are indeed endowed with a super-strong magnetic field and that the twisted magnetosphere scenario is the most likely explanation for their soft X-ray emission. Polarization measurements allowed us to probe the physical conditions of the star’s outermost layers, showing that the cooler surface regions are in a condensed state, with no atmosphere on top. Although no smoking-gun of vacuum QED effects was found, the phase-dependent behavior of the polarization angle strongly hints that vacuum birefringence is indeed at work in magnetar magnetospheres.
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来源期刊
Galaxies
Galaxies Physics and Astronomy-Astronomy and Astrophysics
CiteScore
4.90
自引率
12.00%
发文量
100
审稿时长
11 weeks
期刊介绍: Es una revista internacional de acceso abierto revisada por pares que proporciona un foro avanzado para estudios relacionados con astronomía, astrofísica y cosmología. Areas temáticas Astronomía Astrofísica Cosmología Astronomía observacional: radio, infrarrojo, óptico, rayos X, neutrino, etc. Ciencia planetaria Equipos y tecnologías de astronomía. Ingeniería Aeroespacial Análisis de datos astronómicos. Astroquímica y Astrobiología. Arqueoastronomía Historia de la astronomía y cosmología. Problemas filosóficos en cosmología.
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