Ultra-High-Energy Cosmic Rays May Come from Clustered Sources
Abstract
Clustering of cosmic-ray sources affects the flux observed beyond the cutoff imposed by the cosmic microwave background and may be important in interpreting the AGASA, Fly's Eye, and HiRes data. The standard deviation, σ, in the predicted number N of events above 1020 eV is σ/N=0.9(r0/10 Mpc)0.9, where r0 is the unknown scale length of the correlation function (r0~=10 Mpc for field galaxies, H0=50 km s-1 Mpc-1). Future experiments will allow the determination of r0 through the detection of anisotropies in arrival directions of ~1020 eV cosmic rays over angular scales of Θ~r0/30 Mpc.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- October 2000
- DOI:
- 10.1086/317028
- arXiv:
- arXiv:hep-ph/9912326
- Bibcode:
- 2000ApJ...542..542B
- Keywords:
-
- Acceleration of Particles;
- ISM: Cosmic Rays;
- Cosmology: Theory;
- Cosmology: Large-Scale Structure of Universe;
- High Energy Physics - Phenomenology;
- Astrophysics;
- High Energy Physics - Experiment;
- Nuclear Experiment
- E-Print:
- Accepted for publication in Astrophysical Journal