|
|
The Fermi Gamma-ray Space Telescope has been observing the sky in gamma-rays since August 2008. In addition to breakthrough capabilities in energy coverage (20 MeV-300 GeV) and angular resolution, the wide field of view of the Large Area Telescope enables observations of 20% of the sky at any instant, and of the whole sky every three hours. It has revealed a very animated sky with bright gamma-ray bursts flashing and vanishing in minutes, powerful active galactic nuclei flaring over hours and days, many pulsars twinkling in the Milky Way, and X-ray binaries shimmering along their orbit. Together with more persistent sources such as supernova remnants and pulsar wind nebulae, Fermi has found over a thousand new sources and the wealth of new data already brings important clues to the origin of the high-energy radiation and particles powered by the various kinds of accelerators. I will review the first highlight results obtained by the LAT on this new and animated gamma-ray sky, with a particular emphasis on active galactic nuclei and Galactic sources. |