The Pierre Auger Observatory is studying ultra-high energy cosmic rays, the most energetic and rarest of particles in the universe. When these particles strike the atmosphere, they create extensive air showers of secondary charged particles, which we can detect and reconstruct the properties of the incident cosmic rays. The origin of the ultra high energy cosmic rays with energies above E ) 1017eV, is still unknown. The discovery of their sources will reveal the engines of the most energetic astrophysical accelerators in the universe.
B.04 Guest lecture
COBISS.SI-ID: 4989947The first gravitational wave transient GW150914 was observed by Advanced LIGOon September 14th, 2015 at 09:50:45 Universal Time. In addition to follow-up electromagnetic observations, the detection of neutrinos will probe deeply and more on the nature of astrophysical sources, especially in the ultra-high energy regime. Neutrinos in the EeV energy range were searched in data collected at the surface detector of the Pierre Auger Observatory. No neutrino candidates were found. Based on this non-observation, we derive the first and only neutrino fluence upper limit at EeV energies for this event at 90% CL, and report constraints on existence of accretion disk around mergers.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 4874235The Cherenkov Telescope Array is expected to lead to the detection of many new supernova remnants (SNRs) in the TeV and multi–TeV range. In addition to the individual study of each SNR, the study of these objects as a population can help constraining the parameters describing the acceleration of particles and increasing our understanding of the mechanisms involved. We present Monte Carlo simulations of the population of Galactic SNRs emitting TeV gamma rays. We also discuss how the simulated population can be confronted with future observations to provide a novel test for the SNR hypothesis of cosmic ray origins.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 5100539I presented multi-messenger studies at the Pierre Auger Observatory, which include investigation of astrophysical phenomena using UHECR, UHE photons and neutrinos.
B.04 Guest lecture
COBISS.SI-ID: 4989691The association of at least a dozen ultrahigh-energy cosmic-ray (UHECR) events with energy ?55 EeV detected by the Pierre Auger Observatory (PAO) from the direction of Centaurus-A, the nearest radio galaxy, supports the scenario of UHECR acceleration in the jets of radio galaxies. In this work, we model radio to very high energy (VHE,?100 \rm GeV) ?-ray emission from Cen A, including GeV hardness detected by Fermi-LAT and TeV emission detected by HESS.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 4990971