论文标题
在Swift Gamma-ray爆发的光谱峰值上
On Spectral Peak Energy of Swift Gamma-Ray Bursts
论文作者
论文摘要
由于\ textit {swift}/蝙蝠的狭窄能量带，需要几个紧急问题才能支付更多注意事项，但到目前为止尚未解决。我们系统地研究了283 \ textit {swift}/蝙蝠伽玛射线的精制样品的性能，并以高度置信度大于3 $σ$，具有高度测量的光谱峰值能量（$ e _ {\ text P} $）。有趣的是，发现\ textit {swift}爆发的持续时间（$ t_ {90} $）仍然表现出明显的双峰性，更可靠的边界为$ t_ {90} \ simeq $ 1.06 s，而不是先前受污染的样品，包括先前污染的样品，包括$ 1的$ sim $ s $ 1.2。 Fermi/GBM和\ textit {Swift}/BAT目录的作者。 The \textit{Swift}/BAT short and long bursts have comparable mean $E_{\text p}$ values of $87^{+112}_{-49}$ and $85^{+101}_{-46}$ keV in each, similar to what found for both types of BATSE bursts, which manifests the traditional short-hard/long-soft scheme may not be tenable for the检测器的某些能量窗口。在统计数据中，我们还研究了$ e _ {\ text P} $估计的不同方法的一致性，并发现贝叶斯方法和频段函数始终可以给出一致的评估。相比之下，经常使用的截止功率型模型与下$ e _ {\ text p} $的另外两种方法匹配，并将高估$ e _ {\ text p} $超过70 \％，为$ e _ {\ text p}> $ 100 kev。 X射线闪光灯，X射线富含爆发和经典伽马射线爆发的峰值能量可能会从热为主导到非热主导的辐射机制中具有进化后果。最后，我们发现观察者框架中观察到的$ e _ {\ text p} $和观察到的流动性（$s_γ$）相关联成为$ e_p \ simeq [s_γ/（10^{ - 5} erg \ cm^{ - 2} { - 2}）被认为是GRB峰值能量的有用指标。
Owing to narrow energy band of \textit{Swift}/BAT, several urgent issues are required to pay more attentions but unsolved so far. We systematically study the properties of a refined sample of 283 \textit{Swift}/BAT gamma-ray bursts with well-measured spectral peak energy ($E_{\text p}$) at a high confidence level larger than 3$σ$. It is interestingly found that duration ($T_{90}$) distribution of \textit{Swift} bursts still exhibits an evident bimodality with a more reliable boundary of $T_{90}\simeq$1.06 s instead of 2 s for previously contaminated samples including bursts without well-peaked spectra, which is very close to $\sim$1.27 s and $\sim$0.8 s suggested by some authors for Fermi/GBM and \textit{Swift}/BAT catalogs, respectively. The \textit{Swift}/BAT short and long bursts have comparable mean $E_{\text p}$ values of $87^{+112}_{-49}$ and $85^{+101}_{-46}$ keV in each, similar to what found for both types of BATSE bursts, which manifests the traditional short-hard/long-soft scheme may not be tenable for the certain energy window of a detector. In statistics, we also investigate the consistency of distinct methods for the $E_{\text p}$ estimates and find that Bayesian approach and BAND function can always give consistent evaluations. In contrast, the frequently-used cut-off power-law model matches two other methods for lower $E_{\text p}$ and will overestimate the $E_{\text p}$ more than 70\% as $E_{\text p}>$100 keV. Peak energies of X-ray flashes, X-ray rich bursts and classical gamma-ray bursts could have an evolutionary consequence from thermal-dominated to non-thermal-dominated radiation mechanisms. Finally, we find that the $E_{\text p}$ and the observed fluence ($S_γ$) in the observer frame are correlated as $E_p\simeq [S_γ/(10^{-5} erg\ cm^{-2})]^{0.28}\times 117.5^{+44.7}_{-32.4}$ keV proposed to be an useful indicator of GRB peak energies.
