Compton X-ray and Gamma-ray Emission from Extended Radio Galaxies

Details Compton X-ray and Gamma-ray Emission from Extended Radio Galaxies Compton X-ray and Gamma-ray Emission from Extended Radio Galaxies

2007-04-06

arxiv.org/abs/0704.0835v1

AIP Conf.Proc.921:325-326,2007

Astronomy and Astrophysics

Astrophysics

3 pages, one 3 panel figure. Proceedings of the First GLAST Symposium. (The actual submitted version is 2 pages with reference

Scientific paper

10.1063/1.2757334

The extended lobes of radio galaxies are examined as sources of X-ray and gamma-ray emission via inverse Compton scattering of 3K background photons. The Compton spectra of two exemplary examples, Fornax A and Centaurus A, are estimated using available radio measurements in the ~10's MHz - 10's GHz range. For average lobe magnetic fields of >~0.3-1 micro-G, the lobe spectra are predicted to extend into the soft gamma-rays making them likely detectable with the GLAST LAT. If detected, their large angular extents (~1 deg and 8 deg) will make it possible to ``image'' the radio lobes in gamma-rays. Similarly, this process operates in more distant radio galaxies and the possibility that such systems will be detected as unresolved gamma-ray sources with GLAST is briefly considered.

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