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- Centre National de la Recherche ScientifiqueFR730 papers
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5 papers · 2 filters
Rapid VHE variability in blazars
Francesca Volpe, Frank M. Rieger
Active Galactic Nuclei (AGN) are known to show significant variability over a wide frequency range. We review observational results on the variability characteristics of blazars in…
Molecular Clouds as Cosmic Ray Laboratories
Sabrina Casanova, Felix A. Aharonian, Yasuo Fukui +9
We will here discuss how the gamma-ray emission from molecular clouds can be used to probe the cosmic ray flux in distant regions of the Galaxy and to constrain the highly unknown…
Constraining the Emissivity of Ultrahigh Energy Cosmic Rays in the Distant Universe with the Diffuse Gamma-ray Emission
Xiang-Yu Wang, Ruo-Yu Liu, Felix Aharonian
Ultra-high cosmic rays (UHECRs) with energies >10^19 eV emitted at cosmological distances will be attenuated by cosmic microwave and infrared background radiation through photohadr…
Search for Lorentz Invariance breaking with a likelihood fit of the PKS 2155-304 flare data taken on MJD 53944
HESS Collaboration, A. Abramowski, F. Acero +193
Several models of Quantum Gravity predict Lorentz Symmetry breaking at energy scales approaching the Planck scale (10^{19} GeV). With present photon data from the observations of d…
On the Detectability of High-Energy Galactic Neutrino Sources
Francesco Vissani, Felix Aharonian, Narek Sahakyan
With the arrival of km**3 volume scale neutrino detectors the chances to detect the first astronomical sources of TeV neutrinos will be dramatically increased. While the theoretica…