Discovery of a Pulse-phase-transient Cyclotron Line in the X-Ray pulsar GRO J2058+42
Discovery of a Pulse-phase-transient Cyclotron Line in the X-Ray pulsar GRO J2058+42
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DOI：
10.3847/2041-8213/ab3e4d
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发表时间：
2019-09
期刊：
影响因子：
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通讯作者：
S. Molkov;A. Lutovinov;S. Tsygankov;I. Mereminskiy;A. Mushtukov
中科院分区：
文献类型：
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作者：
S. Molkov;A. Lutovinov;S. Tsygankov;I. Mereminskiy;A. Mushtukov
我们报告的瞬态X射线脉冲星GRO J2058+42的X射线光谱中的吸收功能的发现。这些特征在2019年春季源II型爆发期间进行的两次努斯塔观测中均检测到约10000 keV，12000 keV和13000 keV。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。测量到的能量使我们能够估计该中子星星的磁场强度为1012 G。
We report the discovery of absorption features in the X-ray spectrum of the transient X-ray pulsar GRO J2058+42. The features are detected around ∼10, ∼20, and ∼30 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 ∼1012 G.