ESTIMATING THE FLUX OF THE BRIGHTEST COSMIC-RAY SOURCE ABOVE 57 x 1018 eV

被引：1
|
作者：
Younk, P. W. [1 ]
机构：
[1] Colorado State Univ, Ft Collins, CO 80523 USA
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2009年 / 696卷 / 01期
基金：
美国国家科学基金会;
关键词：
acceleration of particles; LUMINOSITY FUNCTION;
D O I：
10.1088/0004-637X/696/1/L40
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The sources of ultrahigh energy cosmic rays (CRs) are not yet known. However, the discovery of anisotropic CRs above 57 x 10(18) eV by the Pierre Auger Observatory suggests that a direct source detection may soon be possible. The near-future prospects for such a measurement are heavily dependent on the flux of the brightest source. In this work, we show that the flux of the brightest source above 57 x 10(18) eV is expected to comprise 10% or more of the total flux if two general conditions are true. The conditions are: ( 1) the source objects are associated with galaxies other than the Milky Way and its closest neighbors, and ( 2) the CR particles are protons or heavy nuclei such as iron and the Greisen-Zatsepin-Kuz'min effect is occurring. The Pierre Auger Observatory collects approximately 23 events above 57 x 10(18) eV per year. Therefore, it is plausible that, over the course of several years, tens of CRs from a single source will be detected.
引用
收藏
页码：L40 / L42
页数：3
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