arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.04381astro-ph.HE
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用高空天文辐射探测实验探测$\rmγ$射线爆发的瞬发甚高能辐射的前景

Prospects for the detection of the prompt very-high-energy emission from $\rmγ$-ray bursts with the High Altitude Detection of Astronomical Radiation experiment

Guang-Guang Xin, Yu-Hua Yao, Xiang-Li Qian, Cheng Liu, Qi Gao, Dan-Zeng-Luo-Bu, You-Liang Feng, Quan-Bu Gou, Hong-Bo Hu, Hai-Jin Li, Mao-Yuan Liu, Wei Liu, Bing… 展开作者

Guang-Guang Xin, Yu-Hua Yao, Xiang-Li Qian, Cheng Liu, Qi Gao, Dan-Zeng-Luo-Bu, You-Liang Feng, Quan-Bu Gou, Hong-Bo Hu, Hai-Jin Li, Mao-Yuan Liu, Wei Liu, Bing-Qiang Qiao, Zhen Wang, Yi Zhang, Hao Cai, Tian-Lu Chen, Yi-Qing Guo

摘要:

甚高能量的观测(VHE,$\rm >10~GeV$)由$\rm γ$ -射线暴(GRB)产生的$γ$-射线辐射,特别是在瞬发阶段,将为理解GRB的物理环境、相对论体运动、粒子加速机制以及研究Lorentz不变性破坏等提供重要信息。迄今为止,由成像大气切伦科夫望远镜探测到的最高能量光子延伸到TeV范围。然而,对于瞬发阶段,多年来寻找VHE排放的努力没有产生统计上显著的检测结果。宽视场和大于几十GeV的有效面积是探测瞬发相γ暴VHE辐射的必要条件。高空天文辐射探测(HADAR)实验具有这样的优点。在本文中,我们报告了其预期年度GRB检测率的估计,该估计是通过将HADAR仪器的性能与基于唯象模型的理论计算相结合来产生伪GRB种群而获得的。然后,从背景以上的伽玛暴的预期可检测的伽玛射线信号,得到的检测率。在谱模型中,除了带函数外,还为每个伽玛暴事件分配了一个额外的分量。结果表明,如果由于内部吸收的截止能量高于50 GeV,伽玛暴的HADAR实验的检测率约为每年两个或三个伽玛暴,这取决于额外组件的特性略有不同。

英文摘要:

The observation of very-high-energy (VHE, $\rm >10~GeV$) $γ$-ray emission from $\rm γ$-ray bursts (GRBs), especially in the prompt phase, will provide critical information for understanding many aspects of their nature including the physical environment, the relativistic bulk motion, the mechanisms of particle acceleration of GRBs and for studying Lorentz invariance violation, etc. For the afterglow phase, the highest energy photons detected to date by the imaging atmospheric Cherenkov telescopes extend to the TeV regime. However, for the prompt phase, years of efforts in searching for the VHE emission has yielded no statistically significant detections. A wide field-of-view (FOV) and large effective area above tens of GeV are essential for detecting the VHE emissions from GRBs in the prompt phase. The High Altitude Detection of Astronomical Radiation (HADAR) experiment has such merits. In this paper, we report the estimates of its expected annual GRB detection rate, which are obtained by combining the performance of the HADAR instrument with the theoretical calculations based on a phenomenological model to generate the pseudo-GRB population. The expected detectable gamma-ray signal from GRBs above the background is then obtained to give the detection rate. In the spectral model, an extra component is assigned to every GRB event in addition to the Band function. The results indicate that if the energy of the cutoff due to internal absorption is higher than 50 GeV, the detection rate for GRBs for the HADAR experiment is approximately two or three GRBs per year, which varies slightly depending upon the characteristics of the extra component.

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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