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Featured researches published by A. Aab.


Physical Review D | 2016

Energy estimation of cosmic rays with the Engineering Radio Array of the Pierre Auger Observatory

A. Aab; P. Abreu; M. Aglietta; I. Al Samarai; I. F. M. Albuquerque; I. Allekott; P. Allison; W. Docters; S. Messina; Olaf Scholten; van den Ad M Berg

The Auger Engineering Radio Array (AERA) is part of the Pierre Auger Observatory and is used to detect the radio emission of cosmic-ray air showers. These observations are compared to the data of the surface detector stations of the Observatory, which provide well-calibrated information on the cosmic-ray energies and arrival directions. The response of the radio stations in the 30 to 80 MHz regime has been thoroughly calibrated to enable the reconstruction of the incoming electric field. For the latter, the energy density is determined from the radio pulses at each observer position and is interpolated using a two dimensional function that takes into account signal asymmetries due to interference between the geomagnetic and charge excess emission components. The spatial integral over the signal distribution gives a direct measurement of the energy transferred from the primary cosmic ray into radio emission in the AERA frequency range. We measure 15.8 MeV of radiation energy for a 1 EeV air shower arriving perpendicularly to the geomagnetic field. This radiation energy -- corrected for geometrical effects -- is used as a cosmic-ray energy estimator. Performing an absolute energy calibration against the surface-detector information, we observe that this radio-energy estimator scales quadratically with the cosmic-ray energy as expected for coherent emission. We find an energy resolution of the radio reconstruction of 22% for the data set and 17% for a high-quality subset containing only events with at least five radio stations with signal.


Physics Letters B | 2016

Evidence for a mixed mass composition at the ‘ankle’ in the cosmic-ray spectrum

A. Aab


Physical Review D | 2015

Publisher's Note: Muons in air showers at the Pierre Auger Observatory: Mean number in highly inclined events [Phys. Rev. D, 91 , 032003 (2015)]

A. Aab; A. Aminaei; S. Buitink; S. J. De Jong; H. Falcke; S. Grebe; J.R. Hörandel; S. Jansen; A. Nelles; H. Schoorlemmer; J. Schulz; C. Timmermans; G. van Aar; S. van Velzen; S. Wykes


Journal of Instrumentation | 2016

Prototype muon detectors for the AMIGA component of the Pierre Auger Observatory

A. Aab; A. Aminaei; S. Buitink; S. J. De Jong; G. De Mauro; H. Falcke; J.R. Hörandel; S. Jansen; A. Nelles; J. Schulz; C. Timmermans; G. van Aar; S. van Velzen; A. van Vliet; S. Wykes


The Astrophysical Journal | 2018

An Indication of Anisotropy in Arrival Directions of Ultra-high-energy Cosmic Rays through Comparison to the Flux Pattern of Extragalactic Gamma-Ray Sources

A. Aab; P. Abreu; M. Aglietta; I. F. M. Albuquerque; I. Allekotte; A. Almela; S. Buitink; F. Canfora; S. J. De Jong; H. Falcke; J.R. Hörandel; G. De Mauro; C. Timmermans; G. van Aar; A. van Vliet; Z. Zong; F. Zuccarello


Physical Review D | 2017

Inferences on mass composition and tests of hadronic interactions from 0.3 to 100 EeV using the water-Cherenkov detectors of the Pierre Auger Observatory

A. Aab; S. Buitink; F. Canfora; S. J. De Jong; G. De Mauro; H. Falcke; J.R. Hörandel; C. Timmermans; G. van Aar; A. van Vliet


Journal of Cosmology and Astroparticle Physics | 2018

Erratum: Combined fit of spectrum and composition data as measured by the Pierre Auger Observatory (vol 4, 038, 2017)

A. Aab; Stijn Buitink; F. Canfora; S. J. De Jong; G. De Mauro; H. Falcke; J.R. Hörandel; S. Jansen; J. Schulz; C. Timmermans; G. van Aar; A. van Vliet


Physics Letters B | 2016

宇宙線スペクトルの「くるぶし」での混合質量組成の証拠

A. Aab; P. Abreu; M. Aglietta; E. J. Ahn; I. Al Samarai; Albuquerque I.F.M.; I. Allekotte; P. Allison; A. Almela; Castillo J. Alvarez; J. Alvarez-Muñiz; M. Ambrosio; G. A. Anastasi; Luis A. Anchordoqui; B. Andrada; S. Andringa; C. Aramo; F. Arqueros; N. Arsene; H. Asorey; P. Assis; J. Aublin; G. Avila; A. M. Badescu; A. Balaceanu; C. Baus; J. J. Beatty; K. Becker; J. A. Bellido; C. Berat


Physical Review D | 2014

Publisher's Note: Muons in air showers at the Pierre Auger Observatory: Measurement of atmospheric production depth [Phys. Rev. D \textbf{90} , 012012 (2014)]

A. Aab; A. Aminaei; S. J. De Jong; H. Falcke; S. Grebe; J.R. Hörandel; S. Jansen; A. Nelles; H. Schoorlemmer; J. Schulz; C. Timmermans; G. van Aar; S. van Velzen; S. Wykes

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C. Timmermans

Radboud University Nijmegen

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G. van Aar

Radboud University Nijmegen

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H. Falcke

Radboud University Nijmegen

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J.R. Hörandel

Radboud University Nijmegen

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S. J. De Jong

Radboud University Nijmegen

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G. De Mauro

Radboud University Nijmegen

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J. Schulz

Radboud University Nijmegen

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S. Jansen

Radboud University Nijmegen

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A. Aminaei

Radboud University Nijmegen

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A. van Vliet

Radboud University Nijmegen

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