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We investigate the contribution of the beamed jet component to the highenergy emission in young and compact extragalactic radio sources, focusing forthe first time on the gamma-ray band. We derive predictions on the gamma-rayluminosities associated with the relativistic jet assuming a leptonic radiativemodel. The high energy emission is produced via Compton scattering by therelativistic electrons in a spherical region at the considered scales($\lesssim$10 kpc). Simulations show a wide range of gamma-ray luminosities,with intensities up to $\sim10^{46}-10^{48}$ erg s$^{-1}$ depending on theassumed jet parameters. We find a highly linear relation between the simulatedX-ray and gamma-ray luminosities that can be used to select candidates for agamma-ray detection. We compare the simulated luminosity distributions in theradio, X-ray and gamma-ray regimes with observations for the largest sample ofX-ray detected young radio quasars. Our analysis of $\sim$4-year Fermi LargeArea Telescope (LAT) data does not give any statistically significantdetection. However, the majority of the model-predicted gamma-ray fluxes forthe sample are near or below the current Fermi-LAT flux threshold andcompatible with the derived upper limits. Our study gives constraints on theminimum jet power ($L_{jet,kin}/L_{disk}>0.01$), on a potential jetcontribution to the X-ray emission in the most compact sources ($\lesssim1$kpc) and on the particles to magnetic field energy density ratio in broadagreement with equipartition assumption.

Jet Emission in Young Radio Sources: a Fermi-LAT Gamma-ray View