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arXiv 1807.01463astro-ph.HE
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2S 1417-624在一次大爆发期间的光谱和时间研究

Spectral and timing studies of 2S 1417-624 during a giant outburst

Shivangi Gupta, Sachindra Naik, Gaurava K. Jaisawal, Prahlad R. Epili

摘要:

利用{ \it Rossi X射线定时探测器(RXTE)}对吸积动力X射线脉冲星2S~1417-624在2009年的一次大爆发进行了定时和光谱研究。在所有观测时期获得的光变曲线中都检测到了X射线脉动。脉冲星被发现在爆发时正在旋转。脉冲轮廓被观察到强烈依赖于光子能量和亮度。低光度时的双峰结构在爆发的峰值处演化为三峰结构,在爆发的衰变过程中又进一步恢复为双峰结构。还观察到脉冲分数和源通量之间的反相关。脉冲星3-70 keV能谱可用高能截断模型修正的幂律方程描述,并在6.4 keV处出现铁荧光谱线。脉冲轮廓,脉冲分数和光谱参数的演变的基础上观测到的光度,我们解释我们的结果在脉冲星的光束配置从亚临界到超临界制度的变化。

英文摘要:

We present the results obtained from timing and spectral studies of the accretion powered X-ray pulsar 2S~1417-624 during a giant outburst in 2009 by using {\it Rossi X-ray Timing Explorer (RXTE)} observations. X-ray pulsations were detected in the light curves obtained from all epochs of observations. The pulsar was found to be spinning-up during the outburst. The pulse profiles were observed to be strongly dependent on photon energy and luminosity. A double peaked profile at lower luminosity evolved into a triple peaked profile at the peak of the outburst which is further reverted back to a double peaked structure during the decay of the outburst. An anti-correlation was also observed between the pulse fraction and the source flux. The 3-70 keV energy spectrum of pulsar was well described with a power law modified with high energy cutoff model along with an iron fluorescence line at 6.4 keV. Based on the evolution of pulse profile, pulse fraction and spectral parameters across observed luminosity, we interpret our results in terms of changes in the pulsar beam configuration from sub-critical to super-critical regimes.

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