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Abstract: The Telescope Array (TA) experiment is designed to detect air showers induced by ultra high energy cosmic rays. The TA ground Surface particle Detector (TASD) observed several short-time bursts of air shower like events. These bursts are not likely due to chance coincidence between single shower events. The expectation of chance coincidence is less than 10^-4 for five-year's observation. We checked the correlation between these bursts of events and lightning data, and found evidence for correlations in timing and position. Some features of the burst events are similar to those of a normal cosmic ray air shower, and some are not. On this paper, we report the observed bursts of air shower like events and their correlation with lightning.
Keywords: High energy radiation, Lightning, Terrestrial gamma-ray flash
Published in RUNG: 30.04.2020; Views: 2593; Downloads: 0
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Abstract: I cooperated with the Department of Applied Physics III, Faculty of Physics of the Universidad Complutense of Madrid, Spain, as a member of the evaluation committee in charge of awarding with the European mention the doctoral thesis of Dr. Ignacio Vegas Azcárate, entitled “Nanosecond range pulse generators for quality control and diagnosis of Cherenkov telescope cameras”.
Keywords: very-high energy gamma-ray astronomy, imaging atmospheric Cherenkov telescopes (IACTs), IACT camera quality control and diagnostics, nanosecond range pulse generators
Published in RUNG: 06.03.2018; Views: 4489; Downloads: 0
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Keywords: We live in a golden age for astro-particle physics, with a significant number of experiments actively monitoring high-energy Universe. Many of these probes provide excellent tests of particle physics models of dark matter particles. In particular, experiments such as Fermi -LAT, AMS-02, Ice Cube, ... are significantly cutting into the parameter space of one of the most popular candidates, the WIMPs. In this talk I will describe some of the strategies and methods used to search for dark matter with astrophysical data. Special attention will be given to the latest indications of an unaccounted gamma-ray excess at few GeV in the Fermi-LAT data in the region around the Galactic Centre, which steered lots of attention as it was shown to be consistent with putative signals of WIMP dark matter particles and complementary constraints provided by other experiments. Finally I will discuss projections of the expected sensitivities with upcoming experiments and continued data taking with current ones.
Published in RUNG: 17.07.2017; Views: 4980; Downloads: 0
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Keywords: high energy astrophysics, gamma-rays, diffuse background
Published in RUNG: 09.05.2017; Views: 4223; Downloads: 21
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Abstract: Gamma Ray Bursts (GRBs) are the most energetic explosions in the universe, and they have been proposed as the most promising candidate sources of ultra-high energy cosmic rays (UHECRs). As a result of interactions of UHECR within the host environment and during their propagation towards Earth, high energy neutrinos and photons are also expected from both prompt and afterglow emission. In this talk, I will review the standard theory of particle acceleration and production in a GRB fireball, and multi-wavelength and multi-messeger observations of GRB emission. I will present the prediction of PeV — EeV neutrino production and evidence of GeV gamma ray radiation, and the expected detection in IceCube, Pierre Auger Observatory and CTA (the next generation of Imaging Atmospheric Cherenkov Telescopes). The investigation of high-energy particles will provide insight into the nature and complicated mechanisms of GRBs.
Keywords: Gamma-Ray Bursts, high-energy emission, blastwave afterglow
Published in RUNG: 06.12.2016; Views: 4903; Downloads: 0
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