Title: Measurement of the Electric Current in a Kpc-Scale Jet Authors: Kronberg, Philipp P. ×Lovelace, Richard V.E.Lapenta, GiovanniColgate, Stirling A. # Issue Date: 7-Jun-2011 Publisher: I O P Publishing Ltd. Series Title: The Astrophysical Journal. Letters vol:741 issue:L15 Abstract: We present radio emission, polarization, and Faraday rotation maps of the radio jet of the galaxy 3C303. From this data we derive the magnetoplasma and electrodynamic parameters of this $50$ kpc long jet. For one component of this jet we obtain for the first time a direct determination of a {\it galactic}-scale electric current ($\sim 10^{18}$ A), and its direction $-$ {\it positive} away from the AGN. Our analysis strongly supports a model where the jet energy flow is mainly {\it electromagnetic}. ISSN: 2041-8205 Publication status: published KU Leuven publication type: IT Appears in Collections: Plasma-astrophysics Section