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Abstract: The extended lobes of radio galaxies are examined as sources of X-ray andgamma-ray emission via inverse Compton scattering of 3K background photons. TheCompton spectra of two exemplary examples, Fornax A and Centaurus A, areestimated using available radio measurements in the ~10s MHz - 10s GHz range.For average lobe magnetic fields of >~0.3-1 micro-G, the lobe spectra arepredicted to extend into the soft gamma-rays making them likely detectable withthe GLAST LAT. If detected, their large angular extents ~1 deg and 8 deg willmake it possible to ``image the radio lobes in gamma-rays. Similarly, thisprocess operates in more distant radio galaxies and the possibility that suchsystems will be detected as unresolved gamma-ray sources with GLAST is brieflyconsidered.



Author: C.C. Cheung

Source: https://arxiv.org/



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