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arXiv 1708.08067astro-ph.HE
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磁星爆发的宽带光谱研究

Broadband Spectral Investigations of Magnetar Bursts

Demet Kirmizibayrak, Sinem Sasmaz Mus, Yuki Kaneko, Ersin Gogus

摘要:

我们提出了我们的宽带(2 - 250 keV)时间平均光谱分析的388个爆发从SGR J1550-5418,SGR 1900+14和SGR 1806-20检测与罗西X射线定时探测器(RXTE)在这里和作为一个数据库中的同伴网络目录。我们发现,两个黑体函数(BB+BB),两个修改后的黑体函数(LB+LB),黑体和幂律函数(BB+PO)和幂律与高能量指数截止(COMPT)的总和都提供了可接受的适合在类似的水平。我们进行了数值模拟,以约束每个突发光谱的最佳拟合模型,发现67.6%的突发光谱与良好的约束参数更好地描述了康普顿模型。我们还发现,64.7%的爆发谱用LB+LB模型描述比BB+BB和BB+PO更好,这是首次将LB+LB模型用于SGR谱分析。我们发现了一个显着的积极的光子指数的下限趋势,表明硬度的上限下降,相对于总通量和注量。我们比较这一结果与从SGR和AXP源观测到的爆发,并建议的关系是两者之间的一个独特的特点。我们证实了显着的反相关性之间的爆发发射面积和黑体温度,并发现它之间的变化与先前讨论的热,冷黑体温度不同。我们在强磁化中子星的框架下扩展了我们结果的解释。

英文摘要:

We present our broadband (2 - 250 keV) time-averaged spectral analysis of 388 bursts from SGR J1550-5418, SGR 1900+14 and SGR 1806-20 detected with the Rossi X-ray Timing Explorer (RXTE) here and as a database in a companion web-catalog. We find that two blackbody functions (BB+BB), sum of two modified blackbody functions (LB+LB), sum of blackbody and powerlaw functions (BB+PO) and a power law with a high energy exponential cut-off (COMPT) all provide acceptable fits at similar levels. We performed numerical simulations to constrain the best fitting model for each burst spectrum and found that 67.6% burst spectra with well-constrained parameters are better described by the Comptonized model. We also found that 64.7% of these burst spectra are better described with LB+LB model, which is employed in SGR spectral analysis for the first time here, than BB+BB and BB+PO. We found a significant positive lower bound trend on photon index, suggesting a decreasing upper bound on hardness, with respect to total flux and fluence. We compare this result with bursts observed from SGR and AXP sources and suggest the relationship is a distinctive characteristic between the two. We confirm a significant anti-correlation between burst emission area and blackbody temperature and find that it varies between the hot and cool blackbody temperatures differently than previously discussed. We expand on the interpretation of our results in the framework of strongly magnetized neutron star case.

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