A5065131455- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Particle Detector Development and Performance
- Atmospheric Ozone and Climate
- SAS software applications and methods
- Pulsars and Gravitational Waves Research
- Calibration and Measurement Techniques
- High-Energy Particle Collisions Research
- Astronomical Observations and Instrumentation
- Atmospheric aerosols and clouds
- Radiation Detection and Scintillator Technologies
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Radiation Therapy and Dosimetry
- Ionosphere and magnetosphere dynamics
- History and Developments in Astronomy
- Infrared Target Detection Methodologies
- Impact of Light on Environment and Health
- Photocathodes and Microchannel Plates
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
Czech Academy of Sciences, Institute of Physics
2016-2025
University of Buenos Aires
2011-2023
Consejo Nacional de Investigaciones Científicas y Técnicas
2011-2023
Instituto de Tecnologías en Detección y Astropartículas
2016-2023
National University of General San Martín
2016-2023
National Technological University
2016-2023
Pierre Auger Observatory
2016-2023
Institute of Scientific and Technical Research for Defense
2016-2023
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
2021-2023
Universidade de Santiago de Compostela
2010-2023
We present a combined fit of simple astrophysical model UHECR sources to both the energy spectrum and mass composition data measured by Pierre Auger Observatory. The has been performed for energies above 5 ⋅ 1018 eV, i.e. region all-particle so-called "ankle" feature. we adopted consists identical uniformly distributed in comoving volume, where nuclei are accelerated through rigidity-dependent mechanism. results suggest characterized relatively low maximum injection energies, hard spectra...
Abstract A new analysis of the data set from Pierre Auger Observatory provides evidence for anisotropy in arrival directions ultra-high-energy cosmic rays on an intermediate angular scale, which is indicative excess arrivals strong, nearby sources. The consist 5514 events above with zenith angles up to 80° recorded before 2017 April 30. Sky models have been created two distinct populations extragalactic gamma-ray emitters: active galactic nuclei second catalog hard Fermi -LAT sources (2FHL)...
We present a new method for probing the hadronic interaction models at ultrahigh energy and extracting details about mass composition. This is done using time profiles of signals recorded with water-Cherenkov detectors Pierre Auger Observatory. The arise from mix muon electromagnetic components air showers. Using risetimes signals, we define parameter, which use to compare our observations predictions simulations. find, first, inconsistencies between data over greater range substantially...
We present a detailed study of the large-scale anisotropies cosmic rays with energies above 4 EeV measured using Pierre Auger Observatory. For energy bins [4,8] and $E\geq 8$ EeV, most significant signal is dipolar modulation in right ascension at 8 as previously reported. In this paper we further scrutinize highest-energy bin by splitting it into three ranges. find that amplitude dipole increases EeV. The growth can be fitted power law index $\beta=0.79\pm 0.19$. directions dipoles are...
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 achieved combining measurements longitudinal air-shower development particle content at ground measured fluorescence surface detectors, respectively. Only three candidates 1–2 are found, which compatible expected hadron-induced background. Upper limits on...
We present the first measurement of fluctuations in number muons extensive air showers produced by ultrahigh energy cosmic rays. find that measured are good agreement with predictions from shower simulations. This observation provides new insights into origin previously reported deficit simulations and constrains models hadronic interactions at energies. Our is compatible muon originating small deviations interaction particle production accumulate as develop.
We present measurements of the large-scale cosmic-ray anisotropies in right ascension, using data collected by surface detector array Pierre Auger Observatory over more than 14 years. determine equatorial dipole component, $\vec{d}_\perp$, through a Fourier analysis ascension that includes weights for each event so as to account main detector-induced systematic effects. For energies at which trigger efficiency is small, ``East-West'' method employed. Besides from with detectors separated...
With the Auger Engineering Radio Array (AERA) of Pierre Observatory, we have observed radio emission from 561 extensive air showers with zenith angles between 60$^\circ$ and 84$^\circ$. In contrast to more vertical incidence, these inclined illuminate large ground areas several km$^2$ signals detectable in 30 80\,MHz band. A comparison measured radio-signal amplitudes Monte Carlo simulations a subset 50 events for which reconstruct energy using surface detector shows agreement within...
Abstract The hybrid design of the Pierre Auger Observatory allows for measurement properties extensive air showers initiated by ultra-high energy cosmic rays with unprecedented precision. By using an array prototype underground muon detectors, we have performed first direct measurement, Collaboration, content between $$2\times 10^{17}$$ <mml:math...
We use the surface detector of Pierre Auger Observatory to search for air showers initiated by photons with an energy above $10^{19}$ eV. Photons in zenith angle range from 30$^\circ$ 60$^\circ$ can be identified overwhelming background charged cosmic rays through broader time structure signals induced water-Cherenkov detectors array and steeper lateral distribution shower particles reaching ground. Applying method data collected between January 2004 June 2020, upper limits at 95\% CL are...
The atmospheric depth of the air shower maximum $X_{\mathrm{max}}$ is an observable commonly used for determination nuclear mass composition ultra-high energy cosmic rays. Direct measurements are performed using observations longitudinal development with fluorescence telescopes. At same time, several methods have been proposed indirect estimation from characteristics particles registered surface detector arrays. In this paper, we present a deep neural network (DNN) $X_{\mathrm{max}}$....
Data from multiple experiments suggest that the current interaction models used in Monte Carlo simulations do not correctly reproduce hadronic interactions air showers produced by ultra-high-energy cosmic rays (UHECR). We have created a large library of UHECR where at highest energies are slightly modified various ways - but always within constraints accelerator data, without any abrupt changes with energy and assuming specific mechanism or dramatically new physics ultra-high energies....
The Pierre Auger Observatory, at present the largest cosmic-ray observatory ever built, is instrumented with a ground array of 1600 water-Cherenkov detectors, known as Surface Detector (SD). SD samples secondary particle content (mostly photons, electrons, positrons and muons) extensive air showers initiated by cosmic rays energies ranging from $10^{17}~$eV up to more than $10^{20}~$eV. Measuring independent contribution muon component total registered signal crucial enhance capability...
The Pierre Auger Observatory, being the largest air-shower experiment in world, offers an unprecedented exposure to neutral particles at highest energies. Since start of data taking more than 18 years ago, various searches for ultra-high-energy (UHE, $E\gtrsim10^{17}\,\text{eV}$) photons have been performed: either a diffuse flux UHE photons, point sources or associated with transient events like gravitational wave events. In present paper, we summarize these and review current results...
Abstract Simultaneous measurements of air showers with the fluorescence and surface detectors Pierre Auger Observatory allow a sensitive search for EeV photon point sources. Several Galactic extragalactic candidate objects are grouped in classes to reduce statistical penalty many trials from that blind analyzed significant excess above background expectation. The presented does not find any evidence emission at sources, combined p -values every class reported. Particle energy flux upper...
We report a multi-resolution search for anisotropies in the arrival directions of cosmic rays detected at Pierre Auger Observatory with local zenith angles up to 80o and energies excess 4 EeV (4 × 1018 eV). This is conducted by measuring angular power spectrum performing needlet wavelet analysis two independent energy ranges. Both analyses are complementary since achieves better performance identifying large-scale patterns while analysis, considering parameters used this work, presents...
Abstract Elves are a class of transient luminous events, with radial extent typically greater than 250 km, that occur in the lower ionosphere above strong electrical storms. We report observation 1,598 elves, from 2014 to 2016, recorded unprecedented time resolution (100 ns) using fluorescence detector (FD) Pierre Auger Cosmic‐Ray Observatory. The Observatory is located Mendoza province Argentina viewing footprint for elve observations km , reaching areas Pacific and Atlantic Oceans, as well...
AMIGA (Auger Muons and Infill for the Ground Array) is an upgrade of Pierre Auger Observatory to complement study ultra-high-energy cosmic rays (UHECR) by measuring muon content extensive air showers (EAS). It consists array 61 water Cherenkov detectors on a denser spacing in combination with underground scintillation used density measurement. Each detector composed three modules, 10 m2 detection area per module, buried at 2.3 m depth, resulting total 30 m2. Silicon photomultiplier sensors...
We perform simulations for future Cherenkov Telescope Array (CTA) observations of RX~J1713.7$-$3946, a young supernova remnant (SNR) and one the brightest sources ever discovered in very-high-energy (VHE) gamma rays. Special attention is paid to explore possible spatial (anti-)correlations rays with emission at other wavelengths, particular X-rays CO/H{\sc i} emission. present series simulated images RX J1713.7$-$3946 CTA based on set observationally motivated models gamma-ray In these...
Results of a search for ultra-high-energy neutrinos with the Pierre Auger Observatory from direction blazar TXS 0506+056 are presented. They were obtained as part follow-up that stemmed detection high-energy and gamma rays IceCube, \textit{Fermi}-LAT, MAGIC, other detectors electromagnetic radiation in several bands. The is sensitive to energy range 100 PeV EeV zenith angle $\theta=60^\circ$ $\theta=95^\circ$, where measured vertical direction. No have been found. results analyzed three...
Atmospheric conditions, such as the pressure (P), temperature (T) or air density ($\rho \propto P/T$), affect development of extended showers initiated by energetic cosmic rays. We study impact atmospheric variations on reconstruction with data from arrays surface detectors Pierre Auger Observatory, considering separately one detector spacings 1500 m and 750 spacing. observe modulations in event rates that are due to influence measured signals, which energy estimators obtained. show how...
Many atmospheric and climatic criteria have to be taken into account for the selection of a suitable site next generation imaging air-shower Cherenkov telescopes, "Cherenkov Telescope Array" CTA. Such data are not available with sufficient precision, thus comparison proposed sites final decision based on comprehensive characterization is impossible. Identical cross-calibrated instruments been developed which allow precise between sites, cross-validation existing data, ground-validation...