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arXiv 1502.05246astro-ph.HEastro-ph.IM
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一种成分相关的能量标度和踝部cosmic ray原发质量的测定

A composition dependent energy scale and the determination of the cosmic ray primary mass in the ankle region

A. D. Supanitsky, A. Etchegoyen, D. Melo, F. Sanchez

摘要:

关于超高能宇宙射线的起源,目前仍有几个悬而未决的问题。然而,近年来由于皮埃尔俄歇天文台和望远镜阵列等当代地面探测器收集的数据,这一领域取得了很大进展。特别是,人们认为,作为能量函数的宇宙射线的组成的研究可以为理解宇宙射线的起源发挥根本作用。属于这一代的天文台由表面探测器阵列和荧光望远镜组成。荧光望远镜的占空比约为10%,而表面探测器的占空比约为100%。因此,通过使用从由两种类型的探测器同时观测到的一组高质量事件获得的校准曲线来执行由表面探测器观测到的事件的能量校准。这种方法的优点是,由表面探测器观察到的事件的重建能量变得几乎与簇射的模拟无关,因为从荧光望远镜获得的重建能量中只有一小部分来自模拟。然而,以这种方式获得的校准曲线取决于宇宙射线的成分,当考虑对初级能量具有强烈依赖性的参数时,这可能在成分分析中引入偏差。在这项工作中,我们开发了一种分析方法来研究这些影响。我们认为AMIGA,低能量扩展的皮埃尔俄歇天文台对应的表面探测器,以说明使用的方法。

英文摘要:

At present there are still several open questions about the origin of the ultra high energy cosmic rays. However, great progress in this area has been made in recent years due to the data collected by the present generation of ground based detectors like the Pierre Auger Observatory and Telescope Array. In particular, it is believed that the study of the composition of the cosmic rays as a function of energy can play a fundamental role for the understanding of the origin of the cosmic rays. The observatories belonging to this generation are composed of arrays of surface detectors and fluorescence telescopes. The duty cycle of the fluorescence telescopes is ~10 % in contrast with the ~100 % of the surface detectors. Therefore, the energy calibration of the events observed by the surface detectors is performed by using a calibration curve obtained from a set of high quality events observed in coincidence by both types of detectors. The advantage of this method is that the reconstructed energy of the events observed by the surface detectors becomes almost independent of simulations of the showers because just a small part of the reconstructed energy, obtained from the fluorescence telescopes, comes from simulations. However, the calibration curve obtained in this way depends on the composition of the cosmic rays, which can introduce biases in composition analyses when parameters with a strong dependence on primary energy are considered. In this work we develop an analytical method to study these effects. We consider AMIGA, the low energy extension of the Pierre Auger Observatory corresponding to the surface detectors, to illustrate the use of the method.

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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