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arXiv 0912.2148astro-ph.HEastro-ph.IMphysics.data-an
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硬度作为伽马射线暴谱峰的估计

Hardness as a Spectral Peak Estimator for Gamma-Ray Bursts

Amir Shahmoradi, Robert J. Nemiroff

摘要:

简单的硬度比被认为是一个很好的估计谱峰能量的伽马射线暴(GRB)。具体地说,在BATSE伽玛暴谱中的$νF_ν$峰$\epo$与伽玛暴硬度$\hr$之间发现了高相关强度,该强度由BATSE大面积探测器的通道3和4中的注量除以通道1和2中的组合注量来定义。这种相关性与爆发的类型无关,无论是长持续时间GRB(LGRB)还是短持续时间(SGRB),并且在BATSE能量窗口(20-2000 KeV)的宽范围内几乎保持线性。基于贝叶斯定理和马尔可夫链蒙特卡罗技术,我们还提出了观测数据的多变量分析,同时考虑到数据截断和样本不完整性。预测区间的建议\hrep ~关系推导。结果和进一步的模拟用于计算几乎整个BATSE目录的$\epo$估计:2130伽玛暴。这些结果可能有助于研究伽玛暴光谱峰在宇宙学上的应用。

英文摘要:

Simple hardness ratios are found to be a good estimator for the spectral peak energy in Gamma-Ray Bursts (GRBs). Specifically, a high correlation strength is found between the $νF_ν$ peak in the spectrum of BATSE GRBs, $\epo$, and the hardness of GRBs, $\hr$, as defined by the fluences in channels 3 and 4, divided by the combined fluences in channels 1 and 2 of the BATSE Large Area Detectors. The correlation is independent of the type of the burst, whether Long-duration GRB (LGRB) or Short-duration (SGRB) and remains almost linear over the wide range of the BATSE energy window (20-2000 KeV). Based on Bayes theorem and Markov Chain Monte Carlo techniques, we also present multivariate analyses of the observational data while accounting for data truncation and sample-incompleteness. Prediction intervals for the proposed \hrep ~relation are derived. Results and further simulations are used to compute $\epo$ estimates for nearly the entire BATSE catalog: 2130 GRBs. These results may be useful for investigating the cosmological utility of the spectral peak in GRBs intrinsic luminosity estimates.

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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