NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-22 T06:08:17 PDT
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For refcode 2014ApJ...780..165M:
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2014ApJ...780..165M Jet Emission in Young Radio Sources: A Fermi Large Area Telescope Gamma-Ray View Migliori, G.; Siemiginowska, A.; Kelly, B. C.; Stawarz, L.; Celotti, A.; Begelman, M. C. 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 (lsim10 kpc). Simulations show a wide range of gamma-ray luminosities, with intensities up to ~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 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 ~4-yr Fermi Large Area Telescope (LAT) data does not yield any statistically significant detections. 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) of a potential jet contribution to the X-ray emission in the most compact sources (lsim 1 kpc) and on the particle-to-magnetic field energy density ratio that are in broad agreement with equipartition assumptions. Key words: galaxies: active, galaxies: jets, gamma rays: galaxies, radiation mechanisms: non-thermal
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