论文标题
X射线Pulsar gro j2058+42中光谱连续体性质的变化和回旋线的稳定性
Changes in the nature of the spectral continuum and the stability of the cyclotron line in the X-ray pulsar GRO J2058+42
论文作者
论文摘要
报道了瞬态X射线脉冲脉冲GRO J2058+42的宽带光谱和计时研究的结果。数据表明，与以前的Nustar观测值相比，源的脉冲曲线和脉冲分数显着改变，当源更明亮时。在狭窄的相位间隔中，在$ \ sim10 $ keV处的回旋子吸收线与高状态观测值一致。 Spectral analysis showed that at high luminosities $L_{x}\simeq (2.7-3.2)\times 10^{37}$ erg s$^{-1}$ the spectrum has a shape typical of accreting pulsars, while when the luminosity drops by about an order of magnitude, to $2.5\times 10^{36}$ erg s$^{-1}$ a两个组件模型对于其描述是必需的。这种行为符合一个模型，在该模型中，光谱中的低能部分在热点形成，并且高能部分是由于中子恒星表面上方的增生通道中的事件散射而形成的。
The results of the broadband spectral and timing study of the transient X-ray pulsar GRO J2058+42 in a wide energy range at a low luminosity $L_{x} \simeq 2.5\times 10^{36}$ erg s$^{-1}$ are reported. The data revealed that the pulse profile and pulse fraction of the source are significantly changed in comparison with previous NuSTAR observations, when the source was ten times brighter. The cyclotron absorption line at $\sim10$ keV in the narrow phase interval is consistent with the high state observations. Spectral analysis showed that at high luminosities $L_{x}\simeq (2.7-3.2)\times 10^{37}$ erg s$^{-1}$ the spectrum has a shape typical of accreting pulsars, while when the luminosity drops by about an order of magnitude, to $2.5\times 10^{36}$ erg s$^{-1}$ a two-component model is necessary to its describing. This behavior fits into a model in which the low-energy part of the spectrum is formed in a hot spot, and the high-energy part is formed as a result of resonant Compton scattering by incident matter in an accretion channel above the surface of a neutron star.
