Abstract
The Galactic Centre region has been observed by the High Energy Stereoscopic System (H.E.S.S.) array of ground-based Cherenkov telescopes since 2004 leading to the detection of the very-high-energy γ-ray source HESS J1745-290 spatially coincident with the supermassive black hole Sagittarius A*. Diffuse TeV gamma-ray emission has been detected along the Galactic plane, most likely due to hadronic cosmic-ray interactions with the dense gas of the Central Molecular Zone. The rich 2004-2013 dataset permits detailed spectral and morphological studies of the diffuse emission in the inner 300 pc of the Galactic Centre region. The new results provide an important statement regarding the location and origin of the accelerator of PeV protons. The H.E.S.S. observations of the Pevatron are discussed in the context of the origin of Galactic cosmic rays.
Highlights
The Galactic center (GC) region has been longtime observed from radio to X-ray wavelengths with increasing accuracy
Radio and X-ray emissions result from energetic electron interaction with magnetic fields through synchrotron radiation while GeV/TeV emissions are produced by bremsstrahlung and inverse Compton of electrons scattering off gas or ambient radiation fields
The GC has been long time recognized as a multi-TeV particle accelerator and been subject to imaging atmospheric Cherenkov telescopes (IACT) observations of utmost importance
Summary
The Galactic center (GC) region has been longtime observed from radio to X-ray wavelengths with increasing accuracy. Non-thermal radio, X-ray and γ-ray radiations probe charged particles accelerated to high energies in cosmic accelerators such a supernova remnants, pulsar wind nebulae, or massive star forming regions. Radio and X-ray emissions result from energetic electron interaction with magnetic fields through synchrotron radiation while GeV/TeV emissions are produced by bremsstrahlung and inverse Compton of electrons scattering off gas or ambient radiation fields. Another mechanism of high-energy (HE, 10 MeV 100 GeV) and VHE γ-ray emissions proceeds through π0 decays produced by inelastic collision of energetic protons and nuclei with the ambient gas. IACTs such as H.E.S.S., MAGIC and VERITAS, led to the detection of numerous sources in the HE/VHE regimes such as the pulsar wind nebula G0.9+0.1, supernova remnants, a central emission coincident in position with the supermassive black hole Sagittarius (Sgr) A*, as well as a diffuse GeV/TeV emission
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