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M. Aglietta
University of Turin
55Publications
36H-index
4,205Citations
Publications 55
Newest
P. Homola28
Estimated H-index: 28
(University of Leeds),
F. Contreras29
Estimated H-index: 29
+ 390 AuthorsM. Giammarchi38
Estimated H-index: 38
Data taken at the Pierre Auger Observatory are used to search for air showers initiated by ultra-high energy (UHE) photons. Results of searches are reported from hybrid observations where events are measured with both fluorescence and array detectors. Addition- ally, a more stringent test of the photon fluxes predicted with energies above 10 19 eV is made using a larger data set measured using only the surface detectors of the observatory.
9 Citations Source Cite
Published on Feb 2, 2018in The Astrophysical Journal 6.63
A. Aab6
Estimated H-index: 6
(Radboud University Nijmegen),
P. Abreu44
Estimated H-index: 44
(University of Lisbon)
+ 14 AuthorsH. Falcke7
Estimated H-index: 7
(Radboud University Nijmegen)
A new analysis of the data set from the Pierre Auger Observatory provides evidence for anisotropy in the arrival directions of ultra-high-energy cosmic rays on an intermediate angular scale, which is indicative of excess arrivals from strong, nearby sources. The data consist of 5514 events above 20 EeV with zenith angles up to 80 degrees. recorded before 2017 April 30. Sky models have been created for two distinct populations of extragalactic gamma-ray emitters: active galactic nuclei from the s...
14 Citations Source Cite
Published on Oct 16, 2018in Journal of Cosmology and Astroparticle Physics 5.13
A. Aab19
Estimated H-index: 19
,
P. Abreu44
Estimated H-index: 44
+ 14 AuthorsH. Falcke57
Estimated H-index: 57
With the Auger Engineering Radio Array (AERA) of the Pierre Auger Observatory, we have observed the radio emission from 561 extensive air showers with zenith angles between 60$^\circ$ and 84$^\circ$. In contrast to air showers with more vertical incidence, these inclined air showers illuminate large ground areas of several km$^2$ with radio signals detectable in the 30 to 80\,MHz band. A comparison of the measured radio-signal amplitudes with Monte Carlo simulations of a subset of 50 events for ...
1 Citations Source Cite
Published on Nov 12, 2018in Journal of Cosmology and Astroparticle Physics 5.13
A. Aab19
Estimated H-index: 19
,
N. Borodai29
Estimated H-index: 29
+ 384 AuthorsB. Daniel23
Estimated H-index: 23
The profile of the longitudinal development of showers produced by ultra-high energy cosmic rays carries information related to the interaction properties of the primary particles with atmospheric nuclei. In this work, we present the first measurement of the average shower profile in traversed atmospheric depth at the Pierre Auger Observatory. The shapes of profiles are well reproduced by the Gaisser-Hillas parametrization within the range studied, for E > 10^{17.8} eV. A detailed analysis of th...
Published on Nov 30, 2017in The Astrophysical Journal 6.63
A. Albert24
Estimated H-index: 24
,
Michel André21
Estimated H-index: 21
(Polytechnic University of Catalonia)
+ 1927 AuthorsS. Basa19
Estimated H-index: 19
(Aix-Marseille University)
The Advanced LIGO and Advanced Virgo observatories recently discovered gravitational waves from a binary neutron star inspiral. A short gamma-ray burst (GRB) that followed the merger of this binary was also recorded by the Fermi Gamma-ray Burst Monitor (Fermi-GBM), and the Anti-Coincidence Shield for the Spectrometer for the International Gamma-Ray Astrophysics Laboratory (INTEGRAL), indicating particle acceleration by the source. The precise location of the event was determined by optical detec...
18 Citations Source Cite
Published on Apr 6, 2017in Journal of Cosmology and Astroparticle Physics 5.13
A. Aab6
Estimated H-index: 6
(Radboud University Nijmegen),
P. Abreu44
Estimated H-index: 44
(Instituto Superior Técnico)
+ 395 AuthorsG. A. Anastasi8
Estimated H-index: 8
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 compati...
11 Citations Source Cite
Published on Dec 30, 2016in Physical Review D 4.39
A. Aab19
Estimated H-index: 19
(Folkwang University of the Arts),
P. Abreu44
Estimated H-index: 44
(University of Lisbon)
+ 409 AuthorsM. Ambrosio3
Estimated H-index: 3
(Istituto Nazionale di Fisica Nucleare)
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 w...
19 Citations Source Cite
Published on Oct 3, 2016in Physical Review D 4.39
A. Aab19
Estimated H-index: 19
(Folkwang University of the Arts),
P. Abreu44
Estimated H-index: 44
(University of Lisbon)
+ 410 AuthorsM. Ambrosio3
Estimated H-index: 3
(Istituto Nazionale di Fisica Nucleare)
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 be...
4 Citations Source Cite
Published on Oct 31, 2016in Physical Review Letters 8.84
A. Aab19
Estimated H-index: 19
,
P. Abreu44
Estimated H-index: 44
+ 434 AuthorsA. Almela23
Estimated H-index: 23
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 pre...
38 Citations Source Cite
A. Aab19
Estimated H-index: 19
,
P. Abreu44
Estimated H-index: 44
+ 461 AuthorsJ. Alvarez Castillo27
Estimated H-index: 27
The Pierre Auger Observatory has begun a major Upgrade of its already impressive capabilities, with an emphasis on improved mass composition determination using the surface detectors of the Observatory. Known as AugerPrime, the upgrade will include new 4 m$^2$ plastic scintillator detectors on top of all 1660 water-Cherenkov detectors, updated and more flexible surface detector electronics, a large array of buried muon detectors, and an extended duty cycle for operations of the fluorescence dete...
30 Citations Source Cite
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