论文标题
通过X-Calibur硬X射线极化计，Swift XRT和BAT支持的X-Calibur Hard X射线偏光仪观察GX 301-2 Apastron耀斑，以及Fermi GBM
Observations of a GX 301-2 Apastron Flare with the X-Calibur Hard X-Ray Polarimeter Supported by NICER, the Swift XRT and BAT, and Fermi GBM
论文作者
论文摘要
在2018年12月下旬的气球播放X-Calibur硬X射线极性计中观察到了增积力X射线Pulsar GX 301-2，并在2018年12月下旬进行了X射线X射线偏光仪，而Noteer X射线望远镜，Swift X-ray望远镜，Swift X射线望远镜的连续观察，X射线望远镜和爆发警报望远镜以及Fermi Gamma-Ray Ray Ray burs burt Monitor跨度跨度几个月。这些观察结果在罕见的apastron耀斑状态下检测到脉冲星，与Fermi GBM发现的脉冲星的显着旋转相吻合。 X-Calibur，更好的和Swift的观测结果揭示了一个由一个主峰强烈主导的脉冲轮廓，并且更好和快速的数据显示了从脉冲到脉冲的曲线变化很大。 X-Calibur观测值首次限制了高度磁化积分中子星的15-35 keV发射的线性极化，表明在所有脉冲相位的极化度为（27+38-27）％（90％置信度）平均。我们在理论预测的背景下讨论了旋转和X射线光谱和极化结果。最后，我们讨论了对XL-Calibur更敏感的随访任务的未来观察到未来观察的科学潜力。
The accretion-powered X-ray pulsar GX 301-2 was observed with the balloon-borne X-Calibur hard X-ray polarimeter during late December 2018, with contiguous observations by the NICER X-ray telescope, the Swift X-ray Telescope and Burst Alert Telescope, and the Fermi Gamma-ray Burst Monitor spanning several months. The observations detected the pulsar in a rare apastron flaring state coinciding with a significant spin-up of the pulsar discovered with the Fermi GBM. The X-Calibur, NICER, and Swift observations reveal a pulse profile strongly dominated by one main peak, and the NICER and Swift data show strong variation of the profile from pulse to pulse. The X-Calibur observations constrain for the first time the linear polarization of the 15-35 keV emission from a highly magnetized accreting neutron star, indicating a polarization degree of (27+38-27)% (90% confidence limit) averaged over all pulse phases. We discuss the spin-up and the X-ray spectral and polarimetric results in the context of theoretical predictions. We conclude with a discussion of the scientific potential of future observations of highly magnetized neutron stars with the more sensitive follow-up mission XL-Calibur.
