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Ključne besede: ultra-high energy cosmic rays, Pierre Auger Observatory, outreach, social impact
Objavljeno v RUNG: 16.06.2020; Ogledov: 2449; Prenosov: 77
Celotno besedilo (5,83 MB)

Ključne besede: ultra-high energy cosmic rays (UHECR), UHECR energy spectrum, second knee, Pierre Auger Observatory
Objavljeno v RUNG: 16.06.2020; Ogledov: 2595; Prenosov: 79
Celotno besedilo (557,92 KB)

Ključne besede: ultra-high energy cosmic rays (UHECR), UHECR anisotropies, Pierre Auger Observatory
Objavljeno v RUNG: 16.06.2020; Ogledov: 2599; Prenosov: 100
Celotno besedilo (1,65 MB)

Opis: In recent years, an increasing number of ultrafast material science experiments are based on the use of table-top high-harmonic generation (HHG) lightsources [1,2]. Despite the huge success of these first experiments, a major drawback has been the limited repetition rate of these lightsources, in particular with respect to all types of photoemission experiments. Here, we combine newly developed high-repetition rate HHG sources [3,4] with state-of-the-art element-specific magneto-optical Kerr experiments. The chances and prospects for future ultrafast materials science experiments with these lightsources will be discussed.
Ključne besede: High Harmonic Generation, X-Rays, Condensed Matter
Objavljeno v RUNG: 22.05.2020; Ogledov: 3222; Prenosov: 0

Opis: Evidence for a large-scale supergalactic cosmic ray multiplet (arrival directions correlated with energy) structure is reported for ultra-high energy cosmic ray (UHECR) energies above 10^19 eV using seven years of data from the Telescope Array (TA) surface detector and updated to 10 years. Previous energy-position correlation studies have made assumptions regarding magnetic field shapes and strength, and UHECR composition. Here the assumption tested is that, since the supergalactic plane is a fit to the average matter density of the local Large Scale Structure (LSS), UHECR sources and intervening extragalactic magnetic fields are correlated with this plane. This supergalactic deflection hypothesis is tested by the entire field-of-view (FOV) behavior of the strength of intermediate-scale energy-angle correlations. These multiplets are measured in spherical cap section bins (wedges) of the FOV to account for coherent and random magnetic fields. The structure found is consistent with supergalactic deflection, the previously published energy spectrum anisotropy results of TA (the hotspot and coldspot), and toy-model simulations of a supergalactic magnetic sheet. The seven year data post-trial significance of this supergalactic structure of multiplets appearing by chance, on an isotropic sky, is found by Monte Carlo simulation to be 4.19σ. The ten years of data post-trial significance is 4.09σ. Furthermore, the starburst galaxy M82 is shown to be a possible source of the TA Hotspot, and an estimate of the supergalactic magnetic field using UHECR measurements is presented.
Ključne besede: astroparticle physics, cosmic rays, UHECR, supergalactic plane, multiplets, magnetic deflection, large-scale structure of universe
Objavljeno v RUNG: 19.05.2020; Ogledov: 2761; Prenosov: 0
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