搜索结果: 1-12 共查到“高能天体物理学 cosmic rays”相关记录12条 . 查询时间(0.059 秒)
Kneelike structure in the spectrum of the heavy component of cosmic rays observed with KASCADE-Grande
ultra-high energy cosmic rays KASCADE-Grande composition extensive air shower
2011/10/20
We report the observation of a steepening in the cosmic ray energy spectrum of heavy primary particles at about $8 \times 10^{16}$ eV. This structure is also seen in the all-particle energy spectrum, ...
Testing the isotropy of high energy cosmic rays using spherical needlets
Testing isotropy high energy cosmic rays using spherical
2011/10/14
For many decades, ultra-high energy charged particles have been a puzzle for particle physicists and astrophysicists. Nor the sites of production, nor the mechanism responsible for the generation of t...
Constraints on the origin of ultra-high-energy cosmic rays from cosmogenic neutrinos and photons
Astroparticle physics Acceleration of particles Abundances Neutrinos Gamma-rays Relativistic processes
2011/10/11
We study the production of cosmogenic neutrinos and photons during the extragalactic propagation of ultra-high-energy cosmic rays (UHECRs). For a wide range of models in cosmological evolution of sour...
Origin of the Ultrahigh-Energy Cosmic Rays and their Spectral Break
Ultrahigh-Energy Cosmic Rays Spectral Break
2010/11/15
In this concise, albeit subjective review of structure formation, I shall introduce the cosmological standard model and its theoretical and observational underpinnings. I will focus on recent results ...
How to use molecular clouds to study the propagation of cosmic rays in the Galaxy
cosmic rays:origin and propagation gamma rays molecular clouds
2010/11/12
Observations of molecular clouds in the gamma ray domain provide us with a tool to study the distribution of cosmic rays in the Galaxy. This is because cosmic rays can penetrate molecular clouds, unde...
The arrival directions of ultrahigh energy extensive air showers (EAS) by Yakutsk, AGASA and P. Auger data are considered. It is found that the arrival directions of EAS in the Yakutsk and AGASA data ...
We present the main results on the energy spectrum and compo-sition of the highest energy cosmic rays of energy exceeding 1018 eV obtained by the High Resolution Fly’s Eye and the Southern Auger Ob-se...
The Production of Ultra High Energy Cosmic Rays during the Early Epochs of Radio-loud AGN
High Energy Astrophysical Phenomena (astro-ph.HE)
2011/1/4
Powerful radio-loud active galactic nuclei (AGN) with large Mpc-scale jets have been theoretically motivated as emitters of high-energy cosmic rays. Recent radio observations have established a populo...
A Bayesian analysis of the 27 highest energy cosmic rays detected by the Pierre Auger Observatory
High Energy Astrophysical Phenomena (astro-ph.HE) High Energy Physics - Phenomenology (hep-ph)
2010/12/24
It is possible that ultra-high energy cosmic rays (UHECRs) are generated by active galactic nuclei (AGNs), but there is currently no conclusive evidence for this hypothesis. Several reports of correla...
Two-Step Acceleration Model of Cosmic Rays at Middle-Aged SNR
High Energy Astrophysical Phenomena (astro-ph.HE
2010/12/24
Recent gamma-ray observations of middle-aged supernova remnants revealed a mysterious broken power-law spectrum. Using three-dimensional magnetohydrodynamics simulations, we show that the interaction ...
The Search for the Sources of the Cosmic Rays One Century after their Discovery
High Energy Astrophysical Phenomena (astro-ph.HE)
2010/12/23
Despite their discovery potential touching a wide range of science, construction of TeV gamma-ray telescopes, Auger, IceCube and a suite of other particle astrophysics experiments has been largely mot...
Dark Matter detection via lepton cosmic rays
High Energy Astrophysical Phenomena (astro-ph.HE) Cosmology and Extragalactic Astrophysics (astro-ph.CO) High Energy Physics - Phenomenology (hep-ph)
2010/12/23
Recent observations of lepton cosmic rays, coming from the PAMELA and FERMI experiments, have pushed our understanding of the interstellar medium and cosmic rays sources to unprecedented levels.