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arXiv 1208.6574astro-ph.HEhep-ex
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利用皮埃尔俄歇天文台的混合事件测量cosmic ray能谱

Measurement of the cosmic ray energy spectrum using hybrid events of the Pierre Auger Observatory

Mariangela Settimo

摘要:

利用2005年11月至2010年9月皮埃尔俄歇天文台收集的混合事件,测量了10 $^{18}$ eV以上的超高能宇宙射线的能谱。天文台的大曝光允许测量具有高统计数据的能谱的主要特征。全面的蒙特卡罗模拟的广泛的空气淋浴(基于CORSIKA代码)和混合探测器的响应在这里采用作为一个独立的交叉检查的标准分析(物理快报。B 685,239(2010))。质量组成和其他系统的不确定性的依赖进行了详细讨论,并在充分的Monte Carlo方法,一个区域的通量测量的置信度被定义时,所有的不确定性都考虑在内。还报告了通过结合混合光谱和使用表面探测器阵列测量得到的能谱的更新。

英文摘要:

The energy spectrum of ultra-high energy cosmic rays above 10$^{18}$ eV is measured using the hybrid events collected by the Pierre Auger Observatory between November 2005 and September 2010. The large exposure of the Observatory allows the measurement of the main features of the energy spectrum with high statistics. Full Monte Carlo simulations of the extensive air showers (based on the CORSIKA code) and of the hybrid detector response are adopted here as an independent cross check of the standard analysis (Phys. Lett. B 685, 239 (2010)). The dependence on mass composition and other systematic uncertainties are discussed in detail and, in the full Monte Carlo approach, a region of confidence for flux measurements is defined when all the uncertainties are taken into account. An update is also reported of the energy spectrum obtained by combining the hybrid spectrum and that measured using the surface detector array.

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