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Magnetization of jets in luminous blazars

, , und .
(26.11.2014)

Zusammenfassung

Luminosities of many powerful blazars are strongly dominated by \$\gamma\$-rays which most likely result from Comptonization of radiation produced outside a jet. This observation sets certain constraints on composition and energetics of the jet as well as the surrounding quasar environment. We study the dependence of a Compton dominance on a jet magnetization (the magnetic-to-matter energy flux) and on the location of the 'blazar zone'. Calculations are performed for two geometries of broad-emission-line and hot-dust regions: spherical and planar. The jet magnetization corresponding to the large observed Compton dominance is found to be \$0.1 (þeta\_j \Gamma)^2\$ for spherical geometries and \$0.01 (þeta\_j \Gamma)^2\$ for planar geometries, where \$þeta\_j\$ is the jet half-opening angle and \$\Gamma\$ is the jet Lorentz factor. This implies that jets in luminous blazars are matter dominated and that this domination is particularly strong for the flattened geometry of external radiation sources.

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