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arXiv 2501.03576astro-ph.HE
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Be型X射线脉冲星SMC X-2在2022年爆发期间的光谱—计时分析

Spectro-timing analysis of Be X-ray pulsar SMC X-2 during the 2022 outburst

Mohammed Tobrej, Binay Rai, Manoj Ghising, Ruchi Tamang, Bikash Chandra Paul

AI总结:

本研究通过NuSTAR与NICER同步观测分析SMC X-2在2022年爆发中的宽带X射线数据,测得自转周期并确认31 keV CRSF,揭示康普顿化机制、相位变化及超临界吸积迹象。

摘要:

我们利用2022年爆发期间NuSTAR与NICER的同步观测,给出了大质量X射线双星(HMXB)脉冲星SMC X-2的宽带X射线观测结果。发现该源正以2.37281(3)秒的周期自转。除该源X射线连续谱中的铁发射线外,我们还确认了在31 keV处存在回旋共振散射特征(CRSF)。采用物理的整体康普顿化与热康普顿化模型进行的光谱分析表明,整体康普顿化相对于热康普顿化占主导。利用相位分辨光谱学,我们研究了光谱参数相对于脉冲相位的变化,这些变化可能源于脉冲星磁场的复杂结构或发射几何的影响。观测到光谱参数相对于脉冲相位表现出显著的可变性。我们采用时间分辨光谱学来考察连续谱的演化及光谱特征的变化。结合回旋线能量和光子指数变化的光度测量表明,该源可能处于超临界状态下吸积。

英文摘要:

We present broadband X-ray observations of the High Mass X-ray Binary (HMXB) pulsar SMC X-2, using concurrent NuSTAR and NICER observations during its 2022 outburst. The source is found to be spinning with a period of 2.37281(3) s. We confirm the existence of cyclotron resonant scattering feature (CRSF) at 31 keV in addition to the iron emission line in the X-ray continuum of the source. Spectral analysis performed with the physical bulk and thermal Comptonization model indicates that the bulk Comptonization dominates the thermal Comptonization. Using phase-resolved spectroscopy, we have investigated the variations of the spectral parameters relative to pulse phase that may be due to the complex structure of magnetic field of the pulsar or the impact of the emission geometry. It is observed that the spectral parameters exhibit significant variabilities relative to the pulsed phase. Time-resolved spectroscopy is employed to examine the evolution of the continuum and changes in the spectral characteristics. Measurements of luminosity along with variations in cyclotron line energy and photon index suggest that the source may be accreting in the super-critical regime.

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