Event rates of UHE photons cascading in the geomagnetic field at CTA-North
Event rates of UHE photons cascading in the geomagnetic field at CTA-North
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DOI：
10.22323/1.395.0726
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发表时间：
2021-07
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影响因子：
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通讯作者：
K. A. Cheminant;D. Góra;D. A. Castillo;N. Budnev;Alok C. Gupta;P. Homola;B. Łozowski;M. Medvedev;A. Mozgova;M. Pawlik;K. Rzecki;K. Smolek;J. Stasielak;O. Sushchov;A. Tursunov;T. Wibig;J. Zamora-Saá
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作者：
K. A. Cheminant;D. Góra;D. A. Castillo;N. Budnev;Alok C. Gupta;P. Homola;B. Łozowski;M. Medvedev;A. Mozgova;M. Pawlik;K. Rzecki;K. Smolek;J. Stasielak;O. Sushchov;A. Tursunov;T. Wibig;J. Zamora-Saá
从UHECR生产的自上而下模型和GZK效应中，预计EeV范围内及更高范围内的光子。当它们到达地球时，它们在地磁场中转换成电子/正电子对并在大气层上方产生电磁簇射的概率为非零。在这项工作中，我们提出了一种新的方法来寻找级联的UHE光子的伽玛射线望远镜的基础上蒙特-卡罗模拟和多元分析。考虑到未来的CTA-North实验在西班牙拉帕尔马，我们表明，这样的方法提供了一个有效的宇宙射线背景抑制级联UHE光子事件的损失很小。我们还估计，如果伽马射线暴光子发射扩展到EeV制度，在30小时的观测时间内，预期事件的数量可以高达0.17。
Photons in the EeV range and beyond are expected from top-down models of UHECR production and from the GZK effect. As they reach the Earth, they have a non-zero probability of converting into an electron/positron pair in the geomagnetic field and of producing an electromagnetic shower above the atmosphere. In this work, we present a newmethod to search for cascading UHE photons with gamma-ray telescopes based on Monte-Carlo simulations and multivariate analyses. Considering the future CTA-North experiment in La Palma, Spain, we show that such a method provides an efficient cosmic-ray background rejection with little loss of cascading UHE photon events. We also estimate that if gamma-ray bursts photon emission extends to the EeV regime, the number of expected events in 30 hours of observation time can go up to 0.17.