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arXiv 0906.3099astro-ph.HE
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GZK光子通量的模拟研究

Simulation study of GZK photon fluxes

Daniel Kuempel, Karl-Heinz Kampert, Markus Risse

摘要:

超高能(UHE)宇宙射线E>10^17 eV的成分仍然未知。UHE光子的观测将把观测到的电磁波谱扩展到最高能量,并为宇宙中的多信使观测开辟了新的渠道。目前对光子通量的限制已经限制了“奇异”的情况,在这种情况下,超大质量X粒子的衰变产物预计会产生大量光子。受UHE宇宙射线实验(如Pierre Auger天文台)曝光率不断增加的推动,在不久的将来可能会观测到常规产生的GZK光子。我们调查UHE粒子的传播使用蒙特卡罗程序CRPropa。特别是,预期的光子通量归一化到目前的实验以及未来的实验前景进行了说明。不同的源和传播方案进行了分析,并显示对二次GZK光子的影响。对于半人马座A的特定情况下,我们研究了哪些源参数可以通过搜索预期的GZK光子进行测试。

英文摘要:

The composition of ultra-high energy (UHE) cosmic rays E>10^17 eV is still unknown. The observation of UHE photons would extend the observed electromagnetic spectrum to highest energy and open a new channel for multimessenger observations in the universe. Current limits on the photon flux already constrain ``exotic'' scenarios where a large number of photons is expected by the decay products of supermassive X-particles. Motivated by the growing exposure of UHE cosmic ray experiments - like the Pierre Auger Observatory - the observation of conventionally produced GZK photons may be in reach in the near future. We investigate UHE particle propagation using the Monte Carlo code CRPropa. Particularly, the expected photon fluxes normalized to current experiments as well as prospects for future experiments are illustrated. Varying source and propagation scenarios are analyzed and the impact on secondary GZK photons is shown. For the specific case of Centaurus A, we study which source parameters can be tested by searching for the expected GZK photons.

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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