Direct and reprocessed γ-ray emission of kpc-scale jets in FR I radio galaxies

Stawarz, T. M. Kneiske, Jun Kataoka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We discuss the contribution of kiloparsec-scale jets in FR I radio galaxies to the diffuse γ-ray background radiation. The analyzed y-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 kpc-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.

Original languageEnglish
Title of host publicationAIP Conference Proceedings
Pages363-364
Number of pages2
Volume921
DOIs
Publication statusPublished - 2007
Externally publishedYes
Event1st Gamma-ray Large Area Space Telescope Symposium, GLAST - Stanford, CA
Duration: 2007 Feb 52007 Feb 8

Other

Other1st Gamma-ray Large Area Space Telescope Symposium, GLAST
CityStanford, CA
Period07/2/507/2/8

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Keywords

  • Galaxies: Active
  • Galaxies: Jets
  • Gamma-rays: Theory
  • Radiation mechanisms: Non-thermal

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Stawarz, Kneiske, T. M., & Kataoka, J. (2007). Direct and reprocessed γ-ray emission of kpc-scale jets in FR I radio galaxies. In AIP Conference Proceedings (Vol. 921, pp. 363-364) https://doi.org/10.1063/1.2757353