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Type: Journal article
Title: Kiloparsec-scale jets in FR I radio galaxies and the γ-ray background
Other Titles: Kiloparsec-scale jets in FR I radio galaxies and the gamma-ray background
Author: Stawarz, L.
Kneiske, Tanja Manuela
Kataoka, J.
Citation: Astrophysical Journal, 2006; 637(2):693-698
Publisher: University of Chicago Press
Issue Date: 2006
ISSN: 0004-637X
School/Discipline: School of Chemistry and Physics
Abstract: We discuss the contribution of kiloparsec-scale jets in FR I radio galaxies to the diffuse γ-ray background radiation. The analyzed γ-ray emission comes from inverse-Compton scattering of starlight photon fields by the ultrarelativistic electrons whose synchrotron radiation is detected from such sources at radio, optical, and X-ray energies. We find that these objects, under the minimum-power hypothesis (corresponding to a magnetic field of 300 μG in the brightest knots of these jets), can contribute about one percent to the extragalactic γ-ray background measured by EGRET. We point out that this result already indicates that the magnetic fields in kiloparsec-scale jets of low-power radio galaxies are not likely to be smaller than 10 μG on average, as otherwise the extragalactic γ-ray background would be overproduced.
Keywords: galaxies ; active, galaxies ; jets, gamma rays ; theory; radiation mechanisms ; nonthermal
Rights: © 2006. The American Astronomical Society
DOI: 10.1086/498084
Appears in Collections:Physics publications

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