Sky at high energy in the multi-messenger astronomy era

The Universe hosts powerful cosmic particle accelerators, which can today be studied in unprecedented details across the electromagnetic spectrum. These accelerators include Galactic objects ( e.g., pulsars, supernova remants, X-ray binaries) or extragalatic ones (e.g., ragio galaxies, starburst galaxies, gammar-ray bursts.). The seminar will summarize our current knowledge of the high-energy sky, mainly gained through the detection of gamma-rays by the Fermi satellite. Besides photons, other messengers have become available to expand  this knowledge : ultra-high energy cosmic rays, neutrinos, and gravitational waves. 

Some discoveries enabled by these probes as well as recent  extraordinary events in the field will be highlighted.