Spectral analysis of young gamma-ray pulsars with Fermi

The Large Area Telescope (LAT) is the main instrument on board the Fermi Gamma-ray Space Telescope, launched on June 11, 2008. Thanks to its large effective area, good resolution and excellent sensitivity, Fermi has opened a new era for gamma-ray astronomy, in particular it has identified many new gamma-ray pulsars, that will help to study in detail the emission mechanism of these sources. We present a study on the spectrum emission and common features of J0007+7303, J0205+6449, J1833-1034 and J1124-5916 that, together with the Crab, are among the youngest pulsars in the galaxy, with an estimated age <15000 yr.