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arXiv 0811.3401astro-ph
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Swift Burst Alert望远镜观测到的伽马射线暴的Epeak估计

Epeak estimator for Gamma-Ray Bursts Observed by the Swift Burst Alert Telescope

T. Sakamoto, G. Sato, L. Barbier, S. D. Barthelmy, J. R. Cummings, E. E. Fenimore, N. Gehrels, D. Hullinger, H. A. Krimm, D. Q. Lamb, C. B. Markwardt, D. M. Pal… 展开作者

T. Sakamoto, G. Sato, L. Barbier, S. D. Barthelmy, J. R. Cummings, E. E. Fenimore, N. Gehrels, D. Hullinger, H. A. Krimm, D. Q. Lamb, C. B. Markwardt, D. M. Palmer, A. M. Parsons, M. Stamatikos, J. Tueller, T. N. Ukwatta

摘要:

本文报道了雨燕暴警戒望远镜(BAT)探测到的伽马射线暴(GRB)的瞬发光谱的光谱模拟研究的基础上的相关性。这种相关性是在νF_ν谱中的峰值能量Epeak能量与由简单幂律模型导出的光子指数(Γ)之间。假设伽玛暴的谱是典型的光滑破缺的幂律谱,则Epeak与Γ的关系为:\log Epeak = 3.258 - 0.829Γ(1.3 < Γ< 2.3)。我们不仅考虑了Epeak能量和注量的范围,而且还考虑了光滑破缺幂律模型中低能光子指数和高能光子指数的分布。模拟中还包括BAT GRB样品中爆发持续时间的分布。我们的相关性是一致的,由BAT和Epeak测量的BAT,并通过其他GRB仪器观察到的指数。由于BAT观测到的伽玛暴中约有85%与简单幂律模型的拟合是可以接受的,这是因为BAT的能量范围相对较窄,因此当Epeak位于BAT能量范围内时,可以使用这种关系来估计Epeak。

英文摘要:

We report a correlation based on a spectral simulation study of the prompt emission spectra of gamma-ray bursts (GRBs) detected by the Swift Burst Alert Telescope (BAT). The correlation is between the Epeak energy, which is the peak energy in the νF_νspectrum, and the photon index (Γ) derived from a simple power-law model. The Epeak - Γrelation, assuming the typical smoothly broken power-law spectrum of GRBs, is \log Epeak = 3.258 - 0.829Γ(1.3 < Γ< 2.3). We take into account not only a range of Epeak energies and fluences, but also distributions for both the low-energy photon index and the high-energy photon index in the smoothly broken power-law model. The distribution of burst durations in the BAT GRB sample is also included in the simulation. Our correlation is consistent with the index observed by BAT and Epeak measured by the BAT, and by other GRB instruments. Since about 85% of GRBs observed by the BAT are acceptably fit with the simple power-law model because of the relatively narrow energy range of the BAT, this relationship can be used to estimate Epeak when it is located within the BAT energy range.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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