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arXiv 1007.1306astro-ph.HE
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宇宙生成光子作为超高能cosmic ray组合物的试验

Cosmogenic photons as a test of ultra-high energy cosmic ray composition

Dan Hooper, Andrew M. Taylor, Subir Sarkar

摘要:

虽然最近对超高能宇宙射线簇射剖面的测量表明它们主要是由重核引发的,但这些结论依赖于具有很大不确定性的强子相互作用模型。我们研究了宇宙线成分的另一种测试方法,该方法是基于对宇宙线在星系际传播过程中与扩散低能光子背景相互作用产生的超高能光子的观测。我们表明,如果超高能宇宙射线的重核占主导地位,这些光子的流量被抑制约一个数量级相对于质子占主导地位的情况。皮埃尔·俄歇天文台未来的观测可能会使用这个观测值来限制原色的组成,从而为强子相互作用模型提供重要的交叉检查。

英文摘要:

Although recent measurements of the shower profiles of ultra-high energy cosmic rays suggest that they are largely initiated by heavy nuclei, such conclusions rely on hadronic interaction models which have large uncertainties. We investigate an alternative test of cosmic ray composition which is based on the observation of ultra-high energy photons produced through cosmic ray interactions with diffuse low energy photon backgrounds during intergalactic propagation. We show that if the ultra-high energy cosmic rays are dominated by heavy nuclei, the flux of these photons is suppressed by approximately an order of magnitude relative to the proton-dominated case. Future observations by the Pierre Auger Observatory may be able to use this observable to constrain the composition of the primaries, thus providing an important cross-check of hadronic interaction models.

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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