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https://hdl.handle.net/2440/23590
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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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