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

Abstract

We investigate the contribution of the beamed jet component to the high energy emission in young and compact extragalactic radio sources, focusing for the first time on the gamma-ray band. We derive predictions on the gamma-ray luminosities associated with the relativistic jet assuming a leptonic radiative model. The high energy emission is produced via Compton scattering by the relativistic 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 $\sim 10^{46}-10^{48}$ erg s${}^{-1}$ depending on the assumed jet parameters. We find a highly linear relation between the simulated X-ray and gamma-ray luminosities that can be used to select candidates for a gamma-ray detection. We compare the simulated luminosity distributions in the radio, X-ray and gamma-ray regimes with observations for the largest sample of X-ray detected young radio quasars. Our analysis of $\sim$4-year Fermi Large Area Telescope (LAT) data does not give any statistically significant detection. However, the majority of the model-predicted gamma-ray fluxes for the sample are near or below the current Fermi-LAT flux threshold and compatible with the derived upper limits. Our study gives constraints on the minimum jet power ($L_{jet,kin}/L_{disk}>0.01$), on a potential jet contribution to the X-ray emission in the most compact sources ($\lesssim 1$ kpc) and on the particles to magnetic field energy density ratio in broad agreement with equipartition assumption.

21 pages, 8 pages, accepted for publication in ApJ

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