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arXiv 1202.3157astro-ph.HE
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费米伽马射线暴监测仪在其最活跃的活动期间探测到的SGR J1550-5418暴

SGR J1550-5418 bursts detected with the Fermi Gamma-ray Burst Monitor during its most prolific activity

A. J. van der Horst, C. Kouveliotou, N. M. Gorgone, Y. Kaneko, M. G. Baring, S. Guiriec, E. Gogus, J. Granot, A. L. Watts, L. Lin, P. N. Bhat, E. Bissaldi, V. L… 展开作者

A. J. van der Horst, C. Kouveliotou, N. M. Gorgone, Y. Kaneko, M. G. Baring, S. Guiriec, E. Gogus, J. Granot, A. L. Watts, L. Lin, P. N. Bhat, E. Bissaldi, V. L. Chaplin, M. H. Finger, N. Gehrels, M. H. Gibby, M. M. Giles, A. Goldstein, D. Gruber, A. K. Harding, L. Kaper, A. von Kienlin, M. van der Klis, S. McBreen, J. Mcenery, C. A. Meegan, W. S. Paciesas, A. Pe'er, R. D. Preece, E. Ramirez-Ruiz, A. Rau, S. Wachter, C. Wilson-Hodge, P. M. Woods, R. A. M. J. Wijers

摘要:

我们对2009年1月费米伽马射线暴监测器(GBM)探测到的SGR J1550-5418的286个暴进行了详细的时间和时间积分谱分析,得到了SGR J1550-5418暴时间和谱特性的最大均匀样本。我们使用GBM提供的宽带和高时间分辨率数据的组合来进行源特性的统计研究。我们确定的持续时间,发射时间,占空比和上升时间的所有突发,并发现它们是典型的SGR突发。我们探讨了各种模型在我们的光谱分析,并得出结论,SGR J1550-5418爆发在8-200 keV波段的光谱同样很好地描述了光学薄热韧致辐射(OTTB),幂律指数截止(康普顿模型),和两个黑体函数(BB+BB)。在与康普顿模型的谱拟合中,我们发现平均幂律指数为-0.92,接近OTTB指数-1。我们发现康普顿化Epeak与爆发注量和平均通量之间存在反相关。对于BB+BB拟合,我们发现两个黑体函数的注量和发射面积是相关的。低温BB的发射面积与中子星的表面积相当,与温度无关,而高温黑体的发射面积要小得多,并显示出发射面积与温度之间的反相关性。我们比较了这些突发的性质与极端激活期间从其他SGR源观察到的突发,并讨论了磁星突发模型的背景下,我们的结果的影响。

英文摘要:

We have performed detailed temporal and time-integrated spectral analysis of 286 bursts from SGR J1550-5418 detected with the Fermi Gamma-ray Burst Monitor (GBM) in January 2009, resulting in the largest uniform sample of temporal and spectral properties of SGR J1550-5418 bursts. We have used the combination of broadband and high time-resolution data provided with GBM to perform statistical studies for the source properties. We determine the durations, emission times, duty cycles and rise times for all bursts, and find that they are typical of SGR bursts. We explore various models in our spectral analysis, and conclude that the spectra of SGR J1550-5418 bursts in the 8-200 keV band are equally well described by optically thin thermal bremsstrahlung (OTTB), a power law with an exponential cutoff (Comptonized model), and two black-body functions (BB+BB). In the spectral fits with the Comptonized model we find a mean power-law index of -0.92, close to the OTTB index of -1. We show that there is an anti-correlation between the Comptonized Epeak and the burst fluence and average flux. For the BB+BB fits we find that the fluences and emission areas of the two blackbody functions are correlated. The low-temperature BB has an emission area comparable to the neutron star surface area, independent of the temperature, while the high-temperature blackbody has a much smaller area and shows an anti-correlation between emission area and temperature. We compare the properties of these bursts with bursts observed from other SGR sources during extreme activations, and discuss the implications of our results in the context of magnetar burst models.

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