论文标题
X射线Pulsar 1a 0535+262的时间和光谱特性的研究在2020年12月至12月至12月至12月
Study of timing and spectral properties of the X-ray pulsar 1A 0535+262 during the giant outburst in 2020 November-December
论文作者
论文摘要
我们对X射线Pulsar 1A 0535+262的时机和光谱特性进行了详细研究，在2020年11月和12月的巨大爆发中。如Swift/Bat（15--50 keV）所观察到的PULSAR的通量达到$ \ sim $ 12.5螃蟹，相应的质量积聚率为$ \ sim6.67 \ times10^{17} $ g s $^s $^{ - 1} $。从亚临界人物到超临界积聚方案有一个过渡，允许在超临界方面探索源的不同特性。爆发期间的硬度强度图在硬度强度图中检测到类似Q的特征。我们观察到爆发期间脉冲曲线的高可变性和强大的能量依赖性。从$ \ sim44 $ keV中检测到了亚临界状态中的Nustar能量谱，在$ \ sim44 $ keV处检测到回旋子谐振散射功能（CRSF），相应的磁场为$ b \ simeq4.9 \ simeq4.9 \ times10^{12} $g。CRSF的能量转向了CRSF的较低能量。研究了CRSF的亮度依赖性，在超临界方面，线路能量和发光度之间观察到负相关。关键发光度为$ \ sim6 \ times10^{37} $ erg s $^{ - 1} $，在该状态过渡中发生。在临界光度附近观察到光子指数和光度之间的相关性逆转。 Nustar光谱可以通过具有两个连续组件的复合模型描述，黑体发射，截止功率定律和离散组件，以说明6.4 KeV的铁发射线。该模型中包括了另一个环旋吸收特征。
We made a detailed study of the timing and spectral properties of the X-ray pulsar 1A 0535+262 during the recent giant outburst in 2020 November and December. The flux of the pulsar reached a record value of $\sim$12.5 Crab as observed by Swift/BAT (15--50 keV) and the corresponding mass accretion rate was $\sim6.67\times10^{17}$ g s$^{-1}$ near the peak of the outburst. There was a transition from the subcritical to the supercritical accretion regime which allows exploring different properties of the source in the supercritical regime. A q-like feature was detected in the hardness-intensity diagram during the outburst. We observed high variability and strong energy dependence of pulse profiles during the outburst. Cyclotron Resonant Scattering Feature (CRSF) was detected at $\sim44$ keV from the NuSTAR energy spectrum in the subcritical regime and the corresponding magnetic field was $B\simeq4.9\times10^{12}$ G. The energy of the CRSF was shifted towards lower energy in the supercritical regime. The luminosity dependence of the CRSF was studied and during the supercritical regime, a negative correlation was observed between the line energy and luminosity. The critical luminosity was $\sim6\times10^{37}$ erg s$^{-1}$ above which a state transition occurred. A reversal of correlation between the photon index and luminosity was observed near the critical luminosity. The NuSTAR spectra can be described by a composite model with two continuum components, a blackbody emission, cut-off power law, and a discrete component to account for the iron emission line at 6.4 keV. An additional cyclotron absorption feature was included in the model.
