2008
DOI: 10.1088/1742-6596/136/2/022051
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Recent results from the Pierre Auger Observatory

Abstract: Abstract. The main results from the Auger Observatory are described. A steepening of the spectrum is observed at the highest energies, supporting the expectation that above 4 × 10 19 eV the cosmic ray energies are significantly degraded by interactions with the CMB photons (the GZK effect). This is further supported by the correlations observed above 6 × 1019 eV with the distribution of nearby active galaxies, which also show the potential of Auger to start the era of charged particle astronomy. The lack of ob… Show more

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Cited by 5 publications
(4 citation statements)
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“…The power of the reflected signal versus time is governed by the development of the RCS and the bi-static radar equation, which is then modulated by the phase to produce the final waveform in the receiver. The simulation predicts 100-1000 cm 2 for the RCS, depending on parameters like the zenith angle, and the carrier incident angle with respect to the thin wire. To provide a realistic sampling of potentially detectable air showers, three thousand Telescope Array surface detector (SD) events were passed as inputs to the chirp simulation, which requires zenith angle, azimuthal angle, and energy.…”
Section: Performance Estimate From Simulationsmentioning
confidence: 99%
See 1 more Smart Citation
“…The power of the reflected signal versus time is governed by the development of the RCS and the bi-static radar equation, which is then modulated by the phase to produce the final waveform in the receiver. The simulation predicts 100-1000 cm 2 for the RCS, depending on parameters like the zenith angle, and the carrier incident angle with respect to the thin wire. To provide a realistic sampling of potentially detectable air showers, three thousand Telescope Array surface detector (SD) events were passed as inputs to the chirp simulation, which requires zenith angle, azimuthal angle, and energy.…”
Section: Performance Estimate From Simulationsmentioning
confidence: 99%
“…The physics interest in UHECR lies in understanding i) the nature of the cosmic accelerators capable of producing such enormously energetic particles at energies millions to billions of times higher than we are capable of producing in our terrestrial accelerators, ii) the details of the interaction of UHECR with the cosmic ray background, evident in the observed energy spectrum of cosmic rays as an upper 'cut-off' [1], or maximum observed energy, at approximately 10 20 eV, and iii) correlations in the arrival directions of UHECR with exotic objects such as neutron stars, gamma-ray bursts (GRB), and active galactic nuclei (AGN). Experimentally, charged-particle UHECR astronomy is currently dominated by two experiments -the Southern Hemisphere Pierre Auger Observatory (PAO) [2] based in Malargue, Argentina and the Northern Hemisphere Telescope Array (TA) [3] based in Utah, USA. The construction of these observatories is very similar, based on a large number of ground detectors sampling the charged component of Extensive Air Showers (EAS) and deployed over hundreds of square kilometers at ∼1 km spacing, coupled with a much smaller number of atmospheric nitrogen fluorescence detectors having a much more restricted duty cycle, but individually capable of providing a more comprehensive image of atmospheric shower development.…”
Section: Introductionmentioning
confidence: 99%
“…The cosmic ray data from Akeno Giant Air Shower Array (AGASA) [1], Fly's Eye [2], HiRes [3] and Pierre Auger [4] are helping us to understand the physics of the energetic cosmic ray particles coming from the outer space. The important questions to be addressed are, what are their origin, mechanisms of production, composition and how they propagate through the interstellar medium.…”
Section: Introductionmentioning
confidence: 99%
“…Fonte: ROULET (25) Ainda não é totalmente conhecido o motivo que leva a essa mudança no índice espectral, mas as teorias mais aceitas indicam que é uma passagem de fontes que aceleram raios cósmicos localizadas meio galático para o extragalático. Fato esse que é motivado devido a mudança de composição dos primários que atingem a Terra e também à anisotropia do fluxo em altíssimas energias, que será discutido adiante.…”
Section: O Espectro Em Altíssimas Energiasunclassified