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211.
Large-Scale Distribution of Arrival Directions of Cosmic Rays Detected at the Pierre Auger Observatory and the Telescope Array above 10[sup]19 eV
Olivier Deligny, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Saleh, Samo Stanič, Marta Trini, Darko Veberič, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, 2015, objavljeni znanstveni prispevek na konferenci

Opis: The large-scale distribution of arrival directions of high-energy cosmic rays is a key observable in attempts to understanding their origin. The dipole and quadrupole moments are of special interest in revealing potential anisotropies. An unambiguous measurement of these moments as well as of the full set of spherical harmonic coefficients requires full-sky coverage. This can be achieved by combining data from observatories located in both the northern and southern hemispheres. To this end, a joint analysis using data recorded at the Pierre Auger Observatory and the Telescope Array above 10[sup]19 eV has been performed. Thanks to the full-sky coverage, the measurement of the dipole moment reported in this study does not rely on any assumption on the underlying flux of cosmic rays. As well, the resolution on the quadrupole and higher order moments is the best ever obtained. The resulting multipolar expansion of the flux of cosmic rays allows a series of anisotropy searches to be performed, and in particular to report on the first angular power spectrum of cosmic rays. This allows a comprehensive description of the angular distribution of cosmic rays above 10[sup]19 eV.
Ključne besede: Pierre Auger Observatory, Telescope Array, high-energy cosmic rays, large-scale anisotropies, angular power spectrum
Objavljeno v RUNG: 08.03.2016; Ogledov: 5589; Prenosov: 193
.pdf Celotno besedilo (462,61 KB)

212.
Report of the Working Group on the Composition of Ultra-High Energy Cosmic Rays
Michael Unger, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Saleh, Samo Stanič, Marta Trini, Darko Veberič, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, 2015, objavljeni znanstveni prispevek na konferenci

Opis: The atmospheric depth, Xmax, at which the particle number of an air shower reaches its maximum is a good indicator for the mass of the primary particle. We present a comparison of the energy evolution of the mean of Xmax as measured by the Telescope Array and c Collaborations. After accounting for the different resolutions, acceptances and analysis strategies of the two experiments, the two results are found to be in good agreement within systematic uncertainties.
Ključne besede: Pierre Auger Observatory, Telescope Array, Ultra-High Energy Cosmic Rays, elemental composition, extensive air showers, the atmospheric depth of the air shower maximum
Objavljeno v RUNG: 08.03.2016; Ogledov: 5579; Prenosov: 238
.pdf Celotno besedilo (329,86 KB)

213.
Search for a correlation between the UHECRs measured by the Pierre Auger Observatory and the Telescope Array and the neutrino candidate events from IceCube
Asen Christov, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Saleh, Samo Stanič, Marta Trini, Darko Veberič, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, 2015, objavljeni znanstveni prispevek na konferenci

Opis: We have conducted three searches for correlations between ultra-high energy cosmic rays detected by the Telescope Array and the Pierre Auger Observatory, and high-energy neutrino candidate events from IceCube. Two cross-correlation analyses with UHECRs are done: one with 39 cascades from the IceCube ‘high-energy starting events’ sample and the other with 16 high-energy ‘track events’. The angular separation between the arrival directions of neutrinos and UHECRs is scanned over. The same events are also used in a separate search using a maximum likelihood approach, after the neutrino arrival directions are stacked. To estimate the significance we assume UHECR magnetic deflections to be inversely proportional to their energy, with values 3◦, 6◦ and 9◦ at 100 EeV to allow for the uncertainties on the magnetic field strength and UHECR charge. A similar analysis is performed on stacked UHECR arrival directions and the IceCube sample of through-going muon track events which were optimized for neutrino point- source searches.
Ključne besede: ultra-high energy cosmic rays, Pierre Auger Observatory, Telescope Array, high-energy neutrinos, IceCube, correlation search
Objavljeno v RUNG: 08.03.2016; Ogledov: 5929; Prenosov: 197
.pdf Celotno besedilo (1,11 MB)

214.
AugerNext: R&D studies at the Pierre Auger Observatory for a next generation ground-based ultra-high energy cosmic-ray experiment
Andreas Haungs, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Saleh, Samo Stanič, Marta Trini, Darko Veberič, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, 2015, objavljeni znanstveni prispevek na konferenci

Opis: The findings so far of the Pierre Auger Observatory and those of the Telescope Array define some requirements for a possible next generation global cosmic ray observatory: it needs to be considerably increased in size, it needs enhanced sensitivity to composition, and it has to cover the full sky. At the Pierre Auger Observatory, AugerNext aims to conduct some innovative initial research studies on a design of a sophisticated hybrid detector fulfilling these demands. Within a European supported ASPERA/APPEC (Astroparticle Physics European Consortium) project for the years 2011-2014, such R&D studies primarily focused on the following areas: i) consolidation of the detection of cosmic rays using MHz radio antennas; ii) proof- of-principle of cosmic ray microwave detection; iii) test of the large-scale application of new generation photo sensors; iv) generalization of data communication techniques; and v) development of new schemes for muon detection with surface arrays. The AugerNext Consortium consists of 14 principal investigators from 9 countries. This contribution summarizes some achievements of the R&D studies within the AugerNext project.
Ključne besede: ultra-high energy cosmic-ray experiments, Pierre Auger Observatory, Telescope Array, AugerNext research and development study
Objavljeno v RUNG: 03.03.2016; Ogledov: 6663; Prenosov: 200
.pdf Celotno besedilo (594,23 KB)

215.
Schwarzschild-Couder telescope for the Cherenkov Telescope Array
V. Vassiliev, Darko Veberič, 2013, objavljeni znanstveni prispevek na konferenci

Ključne besede: astronomija žarkov gama, Observatorij Cherenkov Telescope Array, teleskopi
Objavljeno v RUNG: 15.10.2013; Ogledov: 5750; Prenosov: 32
URL Povezava na celotno besedilo

216.
217.
FlashCam
G. Pühlhofer, Darko Veberič, 2013, objavljeni znanstveni prispevek na konferenci

Ključne besede: astronomija žarkov gama, Observatorij Cherenkov Telescope Array, zajem podatkov
Objavljeno v RUNG: 15.10.2013; Ogledov: 6713; Prenosov: 27
URL Povezava na celotno besedilo

218.
The IFAE/UAB and LUPM Raman LIDARs for CTA Observatory
A. López Oramas, Darko Veberič, 2013, objavljeni znanstveni prispevek na konferenci

Ključne besede: astronomija žarkov gama, Observatorij Cherenkov Telescope Array, lidar
Objavljeno v RUNG: 15.10.2013; Ogledov: 6931; Prenosov: 29
URL Povezava na celotno besedilo

219.
The NectarCAM camera project
J-F. Glicenstein, Darko Veberič, 2013, objavljeni znanstveni prispevek na konferenci

Ključne besede: astronomija žarkov gama, Observatorij Cherenkov Telescope Array, teleskopi
Objavljeno v RUNG: 15.10.2013; Ogledov: 6038; Prenosov: 35
URL Povezava na celotno besedilo

220.
Sites in Argentina for the Cherenkov Telescope Array Project
Ingo Allekotte, Darko Veberič, 2013, objavljeni znanstveni prispevek na konferenci

Ključne besede: astronomija žarkov gama, Observatorij Cherenkov Telescope Array, izbira lokacije
Objavljeno v RUNG: 15.10.2013; Ogledov: 5745; Prenosov: 40
URL Povezava na celotno besedilo

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