2022年爆发期间Be x射线脉冲星SMC X-2的光谱时序分析

IF 1.9 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Mohammed Tobrej, Binay Rai, Manoj Ghising, Ruchi Tamang, Bikash Chandra Paul
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引用次数: 0

摘要

我们介绍了高质量x射线双星(HMXB)脉冲星SMC X-2的宽带x射线观测,在其2022年爆发期间使用同步的NuSTAR和NICER观测。发现源的自旋周期为2.37281(3)s。我们证实了在~ 31 keV处存在回旋共振散射特征(CRSF),并且在源的x射线连续谱中存在铁发射线。用物理体和热复配模型进行的光谱分析表明,体复配在热复配中占主导地位。利用相位分辨光谱学,我们研究了脉冲星磁场复杂结构或发射几何形状的影响所导致的光谱参数相对于脉冲相位的变化。我们观察到,相对于脉冲相位,光谱参数表现出显著的变化。时间分辨光谱学用于研究连续体的演化和光谱特性的变化。光度测量以及回旋加速器线能量和光子指数的变化表明,源可能在超临界状态下吸积。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Spectro-timing analysis of Be X-ray pulsar SMC X-2 during the 2022 outburst
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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来源期刊
New Astronomy
New Astronomy 地学天文-天文与天体物理
CiteScore
4.00
自引率
10.00%
发文量
109
审稿时长
13.6 weeks
期刊介绍: New Astronomy publishes articles in all fields of astronomy and astrophysics, with a particular focus on computational astronomy: mathematical and astronomy techniques and methodology, simulations, modelling and numerical results and computational techniques in instrumentation. New Astronomy includes full length research articles and review articles. The journal covers solar, stellar, galactic and extragalactic astronomy and astrophysics. It reports on original research in all wavelength bands, ranging from radio to gamma-ray.
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