Astrophysique à Haute Energie

Search for gamma-ray counterparts of astrophysical neutrinos

More than one century after their discovery, the origin of cosmic rays remains one of the most important open questions in astrophysics. They are detected as a flux of charged particles, mainly protons and light nuclei, reaching extremely high energies (up to around 10^20 eV). The detection of cosmic rays implies the existence of efficient particle accelerators in the Universe.

The intensity of cosmic rays in the Galactic centre region

Cosmic rays are energetic particles that reach the Earth from outer space. Most cosmic rays are accelerated within our Galaxy, and remain trapped in the Galactic magnetic field for about 10 million years before escaping in the intergalactic space.

Studying the multi-messenger signature of solar flares

As the 25th solar cycle is about to start, the amount of powerful solar flares is expected to increase.
While solar flares can be observed through electromagnetic (EM) spectrum and with solar energetic  particles (SEPs), we have not yet detected a neutrino signal from these transient phenomena.

Astrophysique à Haute Energie