Study of Small-Scale Anisotropy of Ultra-High-Energy Cosmic Rays Observed in Stereo by the High Resolution Fly’s Eye Detector

Study of Small-Scale Anisotropy of Ultra-High-Energy Cosmic Rays Observed in Stereo by the High Resolution Fly’s Eye Detector
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高分辨率复眼探测器立体观测超高能宇宙线小尺度各向异性研究

DOI：
10.1086/423303
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发表时间：
2004
期刊：
The Astrophysical Journal Letters
影响因子：
--
通讯作者：
A. Zech
A. Zech
中科院分区：
--
文献类型：
--
作者：
R. Abbasi;T. Abu;J. Amann;G. Archbold;R. Atkins;J. Bellido;K. Belov;J. Belz;S. BenZvi;D. Bergman;J. Boyer;G. Burt;Z. Cao;R. Clay;B. Connolly;B. Dawson;W. Deng;Y. Fedorova;J. Findlay;C. Finley;W. Hanlon;C. Hoffman;M. Holzscheiter;G. Hughes;P. Hüntemeyer;C. Jui;K. Kim;M. Kirn;B. Knapp;E. Loh;M. Maestas;N. Manago;E. Mannel;L. Marek;K. Martens;J. Matthews;J. Matthews;A. O'Neill;C. A. Painter;Liam Perera;K. Reil;R. Riehle;M. Roberts;M. Sasaki;S. Schnetzer;M. Seman;K. Simpson;G. Sinnis;J. Smith;R. Snow;P. Sokolsky;C. Song;R. Springer;B. Stokes;J. R. Thomas;S. Thomas;G. Thomson;D. Tupa;S. Westerhoff;L. Wiencke;A. Zech

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高分辨率苍蝇眼(HIRES)实验是一种空气荧光探测器，工作在立体模式，具有0.°6的典型角分辨率，对能量超过1018 eV的宇宙射线很敏感。因此，HiRes宇宙射线探测器是研究超高能宇宙射线到达方向的极佳仪器。我们给出了在小尺度(&lt；5°)和最高能量(&gt；1019 eV)的到达方向分布中各向异性的搜索结果。搜索是基于1999年12月至2004年1月期间记录的数据，总共有271次1019 EV以上的事件。没有发现小尺度各向异性，在HiRes立体数据中发现的最强聚集在52%的水平上与各向同性分布的到达方向的零假设相一致。
The High Resolution Fly's Eye (HiRes) experiment is an air fluorescence detector which, operating in stereo mode, has a typical angular resolution of 0.°6 and is sensitive to cosmic rays with energies above 1018 eV. The HiRes cosmic-ray detector is thus an excellent instrument for the study of the arrival directions of ultra-high-energy cosmic rays. We present the results of a search for anisotropies in the distribution of arrival directions on small scales (<5°) and at the highest energies (>1019 eV). The search is based on data recorded between 1999 December and 2004 January, with a total of 271 events above 1019 eV. No small-scale anisotropy is found, and the strongest clustering found in the HiRes stereo data is consistent at the 52% level with the null hypothesis of isotropically distributed arrival directions.