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arXiv 1909.09159astro-ph.HE
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X射线脉冲星GROJ2058 +42中脉冲相位瞬态回旋线的发现

Discovery of a pulse-phase-transient cyclotron line in the X-ray pulsar GROJ2058+42

S. Molkov, A. Lutovinov, S. Tsygankov, I. Mereminskiy, A. Mushtukov

摘要:

本文报道了瞬变X射线脉冲星GROJ 2058 +42的X射线谱中吸收特征的发现。在2019年春季源II型爆发期间进行的两次NuSTAR观测中,在$\sim10$,$\sim20$和$\sim30$ keV附近检测到这些特征。最有趣的特性是,这些能量附近的光子赤字仅在脉冲星自旋周期的10%左右的窄相位间隔内记录。我们解释这些吸收线作为回旋共振散射线(基本)和两个高次谐波。测得的能量使我们能够估计中子星的磁场强度为$\sim10^{12}$ G。

英文摘要:

We report the discovery of absorption features in the X-ray spectrum of the transient X-ray pulsar GROJ2058+42. The features are detected around $\sim10$, $\sim20$ and $\sim30$ keV in both NuSTAR observations carried out during the source type II outburst in spring 2019. The most intriguing property is that the deficit of photons around these energies is registered only in the narrow phase interval covering around 10% of the pulsar spin period. We interpret these absorption lines as a cyclotron resonant scattering line (fundamental) and two higher harmonics. The measured energy allow us to estimate the magnetic field strength of the neutron star as $\sim10^{12}$ G.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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