ar X iv : a st ro - p h / 05 10 24 2 v 1 8 O ct 2 00 5 Possible Origin of Clusters in Ultra - High - Energy Cosmic Rays
نویسنده
چکیده
We estimate the detection rate of ultrahigh-energy cosmic rays on ground-based arrays by assuming that the cosmic-ray sources are active galactic nuclei. We analyze the cases of detection of clusters, several particles that arrived, within the error limits, from the same area of the sky. The adopted model is shown to explain the detection rate of clusters on the AGASA array.
منابع مشابه
ar X iv : a st ro - p h / 05 10 32 1 v 1 1 1 O ct 2 00 5 High - energy Cosmic Rays ⋆
After a brief review of galactic cosmic rays in the GeV to TeV energy range, we describe some current problems of interest for particles of very high energy. Particularly interesting are two features of the spectrum, the knee above 10 eV and the ankle above 10 eV. An important question is whether the highest energy particles are of extra-galactic origin and, if so, at what energy the transition...
متن کاملar X iv : a st ro - p h / 04 10 41 3 v 1 1 8 O ct 2 00 4 Quantum - Gravity phenomenology and high energy particle propagation
Quantum-gravity effects may introduce relevant consequences for the propagation and interaction of high energy cosmic rays particles. Assuming the space-time foamy structure results in an intrinsic uncertainty of energy and momentum of particles, we show how low energy (under GZK) observations can provide strong constraints on the role of the fluctuating space-time structure.
متن کاملar X iv : a st ro - p h / 04 05 25 8 v 2 1 7 M ar 2 00 5 Ultra - high energy cosmic rays from a finite number of point sources
We have calculated the probability that the clustering of arrival directions of ultra-high energy cosmic rays (UHECRs) is consistent with a finite number of uniformly distributed proton sources, assuming the case of small deflections by magnetic fields outside the Galaxy. A continuous source distribution is mimicked only by an un-realisticly high source density, n s ≫ 10 −2 /Mpc 3. Even for den...
متن کاملar X iv : a st ro - p h / 02 11 05 1 v 1 4 N ov 2 00 2 Ultra - High Energy Gamma Rays in Geomagnetic Field and Atmosphere
The nature and origin of ultra-high energy (UHE: referring to > 1019 eV) cosmic rays are great mysteries in modern astrophysics. The current theories for their explanation include the so-called ”top-down” decay scenarios whose main signature is a large ratio of UHE gamma rays to protons. Important step in determining the primary composition at ultra-high energies is the study of air shower deve...
متن کاملar X iv : a st ro - p h / 98 12 05 5 v 1 3 D ec 1 99 8 ADP - AT - 98 - 9 Acceleration and Interaction of Ultra High Energy Cosmic Rays
In this chapter I give an overview of shock acceleration , including a discussion of the maximum energies possible and the shape of the spectrum near cutoff , interactions of high energy cosmic rays with, and propagation through, the background radiation, and the resulting electron-photon cascade. Possible sources of the highest energy cosmic rays are discussed including active galaxies , gamma...
متن کامل