论文标题
在边缘上积聚：BE/X射线二进制2s 1553-542中的亮度依赖性回旋线伴随着增生状态过渡
Accreting on the edge: a luminosity-dependent cyclotron line in the Be/X-ray Binary 2S 1553-542 accompanied by accretion regimes transition
论文作者
论文摘要
积聚X射线脉冲星（XRP）经历了发光的X射线爆发，在此过程中，可以详细分析中子恒星发射的光度依赖性光谱和时机特征，从而阐明工作中的积聚方案。我们利用了与Nustar，Swift/XRT，Astrosat和Nice进行的监视运动，遵循BE/X射线二进制二进制2S 1553-542沿其罕见爆发之一，并追踪其光谱和时机的演变。我们在该来源中首次报告了依赖光度的回旋线能量的发现。脉冲曲线和脉冲分数还显示出沿爆发的变异性，一致地说，源源从亚临界物转变为超临界识别积聚制度，并由l $ _ {crit} \ lim _ {crit} \ oft of times10^{37} {37} $ erg/s的临界光度隔开。
Accreting X-ray pulsars (XRPs) undergo luminous X-ray outbursts during which the luminosity-dependent spectral and timing features of the neutron star's emission can be analyzed in detail, thus shedding light on the accretion regime at work. We took advantage of a monitoring campaign performed with NuSTAR, Swift/XRT, AstroSat and NICER, to follow the Be/X-ray Binary 2S 1553-542 along one of its rare outbursts and trace its spectral and timing evolution. We report the discovery of a luminosity-dependent cyclotron line energy for the first time in this source. The pulse profiles and pulsed fraction also show variability along the outburst, consistently with the interpretation that the source transitions from the sub-critical to the super-critical accretion regime, separated by a critical luminosity of L$_{crit}\approx4\times10^{37}$ erg/s.
