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9 9.0

The Latin American Giant Observatory: Contributions to the 34th International Cosmic Ray Conference (ICRC 2015)

Jun 29, 2018 06/18

by The LAGO Collaboration; W. Alvarez; C. Alvarez; C. Araujo; O. Areso; H. Arnaldi; H. Asorey; M. Audelo; H. Barros; X. Bertou; M. Bonnett; R. Calderon; M. Calderon; A. Campos-Fauth; A. Carramiñana; E. Carrasco; E. Carrera; D. Cazar; E. Cifuentes; D. Cogollo; R. Conde; J. Cotzomi; S. Dasso; A. De Castro; J. De La Torre; R. De León; A. Estupiñan; A. Galindo; L. Garcia; M. Gómez Berisso; M. González; W. Guevara; A. M. Gulisano; H. Hernández; A. Jaimes; J. López; C. Mantilla; R. Martín; A....

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The Latin American Giant Observatory (LAGO) is an extended cosmic ray observatory composed by a network of water-Cherenkov detectors spanning over different sites located at significantly different altitudes (from sea level up to more than $5000$\,m a.s.l.) and latitudes across Latin America, covering a huge range of geomagnetic rigidity cut-offs and atmospheric absorption/reaction levels. This detection network is designed to measure the temporal evolution of the radiation flux at ground level...
Topics: Astrophysics, High Energy Astrophysical Phenomena, Instrumentation and Methods for Astrophysics
Source: http://arxiv.org/abs/1605.02151

Arxiv.org

11 11

$Search for photons with energies above 10$^{18}$ eV using the hybrid detector of the Pierre Auger Observatory$

Search for photons with energies above 10$^{18}$ eV using the hybrid detector of the Pierre Auger Observatory

Jun 29, 2018 06/18

by The Pierre Auger Collaboration; A. Aab; P. Abreu; M. Aglietta; I. Al Samarai; I. F. M. Albuquerque; I. Allekotte; A. Almela; J. Alvarez Castillo; J. Alvarez-Muñiz; G. A. Anastasi; M. Erdmann; M. Erfani; C. O. Escobar; J. Espadanal; A. Etchegoyen; H. Falcke; G. Farrar; A. C. Fauth; N. Fazzini; B. Fick; L. Anchordoqui; J. M. Figueira; A. Filipčič; O. Fratu; M. M. Freire; T. Fujii; A. Fuster; R. Gaior; B. García; D. Garcia-Pinto; F. Gaté; B. Andrada; H. Gemmeke; A. Gherghel-Lascu; P. L. Ghia;...

eye 11

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A search for ultra-high energy photons with energies above 1 EeV is performed using nine years of data collected by the Pierre Auger Observatory in hybrid operation mode. An unprecedented separation power between photon and hadron primaries is achieved by combining measurements of the longitudinal air-shower development with the particle content at ground measured by the fluorescence and surface detectors, respectively. Only three photon candidates at energies 1 - 2 EeV are found, which is...
Topics: Astrophysics, High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Source: http://arxiv.org/abs/1612.01517

Arxiv.org

11 11

A targeted search for point sources of EeV photons with the Pierre Auger Observatory

Jun 29, 2018 06/18

eye 11

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Simultaneous measurements of air showers with the fluorescence and surface detectors of the Pierre Auger Observatory allow a sensitive search for EeV photon point sources. Several Galactic and extragalactic candidate objects are grouped in classes to reduce the statistical penalty of many trials from that of a blind search and are analyzed for a significant excess above the background expectation. The presented search does not find any evidence for photon emission at candidate sources, and...
Topics: Astrophysics, High Energy Astrophysical Phenomena, High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1612.04155

Arxiv.org

12 12

Ultrahigh-energy neutrino follow-up of Gravitational Wave events GW150914 and GW151226 with the Pierre Auger Observatory

Jun 29, 2018 06/18

by The Pierre Auger Collaboration; A. Aab; P. Abreu; M. Aglietta; I. Al Samarai; I. F. M. Albuquerque; I. Allekotte; A. Almela; J. Alvarez Castillo; J. Alvarez-Muñiz; M. Ambrosio; A. Dundovic; J. Ebr; R. Engel; M. Erdmann; M. Erfani; C. O. Escobar; J. Espadanal; A. Etchegoyen; H. Falcke; K. Fang; G. A. Anastasi; G. Farrar; A. C. Fauth; N. Fazzini; B. Fick; J. M. Figueira; A. Filipčič; O. Fratu; M. M. Freire; T. Fujii; A. Fuster; L. Anchordoqui; R. Gaior; B. García; D. Garcia-Pinto; F. Gaté;...

eye 12

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On September 14, 2015 the Advanced LIGO detectors observed their first gravitational-wave (GW) transient GW150914. This was followed by a second GW event observed on December 26, 2015. Both events were inferred to have arisen from the merger of black holes in binary systems. Such a system may emit neutrinos if there are magnetic fields and disk debris remaining from the formation of the two black holes. With the surface detector array of the Pierre Auger Observatory we can search for neutrinos...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1608.07378

Arxiv.org

6 6.0

Search for ultrarelativistic magnetic monopoles with the Pierre Auger Observatory

Jun 29, 2018 06/18

eye 6

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We present a search for ultra-relativistic magnetic monopoles with the Pierre Auger Observatory. Such particles, possibly a relic of phase transitions in the early universe, would deposit a large amount of energy along their path through the atmosphere, comparable to that of ultrahigh-energy cosmic rays (UHECRs). The air shower profile of a magnetic monopole can be effectively distinguished by the fluorescence detector from that of standard UHECRs. No candidate was found in the data collected...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1609.04451

Arxiv.org

13 13

Calibration of the Logarithmic-Periodic Dipole Antenna (LPDA) Radio Stations at the Pierre Auger Observatory using an Octocopter

Jun 30, 2018 06/18

by The Pierre Auger Collaboration; A. Aab; P. Abreu; M. Aglietta; I. Al Samarai; I. F. M. Albuquerque; I. Allekotte; A. Almela; J. Alvarez Castillo; J. Alvarez-Muñiz; G. A. Anastasi; A. Dundovic; J. Ebr; R. Engel; M. Erdmann; M. Erfani; C. O. Escobar; J. Espadanal; A. Etchegoyen; H. Falcke; G. Farrar; L. Anchordoqui; A. C. Fauth; N. Fazzini; F. Fenu; B. Fick; J. M. Figueira; A. Filipčič; O. Fratu; M. M. Freire; T. Fujii; A. Fuster; B. Andrada; R. Gaior; B. García; D. Garcia-Pinto; F. Gaté; H....

eye 13

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An in-situ calibration of a logarithmic periodic dipole antenna with a frequency coverage of 30 MHz to 80 MHz is performed. Such antennas are part of a radio station system used for detection of cosmic ray induced air showers at the Engineering Radio Array of the Pierre Auger Observatory, the so-called Auger Engineering Radio Array (AERA). The directional and frequency characteristics of the broadband antenna are investigated using a remotely piloted aircraft (RPA) carrying a small transmitting...
Topics: High Energy Astrophysical Phenomena, Instrumentation and Methods for Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1702.01392

Arxiv.org

14 14

Muon Counting using Silicon Photomultipliers in the AMIGA detector of the Pierre Auger Observatory

Jun 30, 2018 06/18

by The Pierre Auger Collaboration; A. Aab; P. Abreu; M. Aglietta; E. J. Ahn; I. Al Samarai; I. F. M. Albuquerque; I. Allekotte; P. Allison; A. Almela; J. Alvarez Castillo; C. Dobrigkeit; J. C. D'Olivo; A. Dorofeev; R. C. dos Anjos; M. T. Dova; A. Dundovic; J. Ebr; R. Engel; M. Erdmann; M. Erfani; J. Alvarez-Muñiz; C. O. Escobar; J. Espadanal; A. Etchegoyen; H. Falcke; K. Fang; G. Farrar; A. C. Fauth; N. Fazzini; B. Fick; J. M. Figueira; M. Ambrosio; A. Filevich; A. Filipčič; O. Fratu; M. M....

eye 14

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AMIGA (Auger Muons and Infill for the Ground Array) is an upgrade of the Pierre Auger Observatory designed to extend its energy range of detection and to directly measure the muon content of the cosmic ray primary particle showers. The array will be formed by an infill of surface water-Cherenkov detectors associated with buried scintillation counters employed for muon counting. Each counter is composed of three scintillation modules, with a 10 m$^2$ detection area per module. In this paper, a...
Topics: Instrumentation and Detectors, Physics, Instrumentation and Methods for Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1703.06193

Arxiv.org

10 10.0

Testing Hadronic Interactions at Ultrahigh Energies with Air Showers Measured by the Pierre Auger Observatory

Jun 29, 2018 06/18

by The Pierre Auger Collaboration; A. Aab; P. Abreu; M. Aglietta; E. J. Ahn; I. Al Samarai; I. F. M. Albuquerque; I. Allekotte; J. Allen; P. Allison; A. Almela; M. L. Díaz Castro; F. Diogo; C. Dobrigkeit; J. C. D'Olivo; A. Dorofeev; R. C. dos Anjos; M. T. Dova; A. Dundovic; J. Ebr; R. Engel; J. Alvarez Castillo; M. Erdmann; M. Erfani; C. O. Escobar; J. Espadanal; A. Etchegoyen; H. Falcke; K. Fang; G. Farrar; A. C. Fauth; N. Fazzini; J. Alvarez-Muñiz; A. P. Ferguson; B. Fick; J. M. Figueira; A....

eye 10

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Ultrahigh energy cosmic ray air showers probe particle physics at energies beyond the reach of accelerators. Here we introduce a new method to test hadronic interaction models without relying on the absolute energy calibration, and apply it to events with primary energy 6-16 EeV (E_CM = 110-170 TeV), whose longitudinal development and lateral distribution were simultaneously measured by the Pierre Auger Observatory. The average hadronic shower is 1.33 +- 0.16 (1.61 +- 0.21) times larger than...
Topics: Astrophysics, High Energy Astrophysical Phenomena, High Energy Physics - Phenomenology, High Energy...
Source: http://arxiv.org/abs/1610.08509

Arxiv.org

8 8.0

Azimuthal asymmetry in the risetime of the surface detector signals of the Pierre Auger Observatory

Jun 29, 2018 06/18

by The Pierre Auger Collaboration; A. Aab; P. Abreu; M. Aglietta; E. J. Ahn; I. Al Samarai; I. F. M. Albuquerque; I. Allekotte; P. Allison; A. Almela; J. Alvarez Castillo; M. L. Díaz Castro; F. Diogo; C. Dobrigkeit; J. C. D'Olivo; A. Dorofeev; R. C. dos Anjos; M. T. Dova; A. Dundovic; J. Ebr; R. Engel; J. Alvarez-Muñiz; M. Erdmann; M. Erfani; C. O. Escobar; J. Espadanal; A. Etchegoyen; H. Falcke; K. Fang; G. Farrar; A. C. Fauth; N. Fazzini; M. Ambrosio; A. P. Ferguson; B. Fick; J. M. Figueira;...

eye 8

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The azimuthal asymmetry in the risetime of signals in Auger surface detector stations is a source of information on shower development. The azimuthal asymmetry is due to a combination of the longitudinal evolution of the shower and geometrical effects related to the angles of incidence of the particles into the detectors. The magnitude of the effect depends upon the zenith angle and state of development of the shower and thus provides a novel observable, $(\sec \theta)_\mathrm{max}$, sensitive...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1604.00978

Arxiv.org

18 18

Evidence for a mixed mass composition at the `ankle' in the cosmic-ray spectrum

Jun 29, 2018 06/18

eye 18

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We report a first measurement for ultra-high energy cosmic rays of the correlation between the depth of shower maximum and the signal in the water Cherenkov stations of air-showers registered simultaneously by the fluorescence and the surface detectors of the Pierre Auger Observatory. Such a correlation measurement is a unique feature of a hybrid air-shower observatory with sensitivity to both the electromagnetic and muonic components. It allows an accurate determination of the spread of...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1609.08567

Arxiv.org

13 13

Search for correlations between the arrival directions of IceCube neutrino events and ultrahigh-energy cosmic rays detected by the Pierre Auger Observatory and the Telescope Array

Jun 28, 2018 06/18

by The IceCube Collaboration; M. G. Aartsen; K. Abraham; M. Ackermann; J. Adams; J. A. Aguilar; M. Ahlers; M. Ahrens; D. Altmann; T. Anderson; I. Ansseau; Z. Griffith; A. Groß; C. Ha; C. Haack; A. Haj Ismail; A. Hallgren; F. Halzen; E. Hansen; B. Hansmann; K. Hanson; M. Archinger; D. Hebecker; D. Heereman; K. Helbing; R. Hellauer; S. Hickford; J. Hignight; G. C. Hill; K. D. Hoffman; R. Hoffmann; K. Holzapfel; C. Arguelles; A. Homeier; K. Hoshina; F. Huang; M. Huber; W. Huelsnitz; P. O. Hulth; K....

eye 13

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This paper presents the results of different searches for correlations between very high-energy neutrino candidates detected by IceCube and the highest-energy cosmic rays measured by the Pierre Auger Observatory and the Telescope Array. We first consider samples of cascade neutrino events and of high-energy neutrino-induced muon tracks, which provided evidence for a neutrino flux of astrophysical origin, and study their cross-correlation with the ultrahigh-energy cosmic ray (UHECR) samples as a...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1511.09408

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