Fermi Gamma-Ray Imaging of a Radio Galaxy
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en
Article de revue
Ce document a été publié dans
Science. 2010-05-07, vol. 328, p. 725-729
American Association for the Advancement of Science (AAAS)
Résumé en anglais
The Fermi Gamma-ray Space Telescope has detected the {gamma}-ray glow emanating from the giant radio lobes of the radio galaxy Centaurus A. The resolved {gamma}-ray image shows the lobes clearly separated from the central ...Lire la suite >
The Fermi Gamma-ray Space Telescope has detected the {gamma}-ray glow emanating from the giant radio lobes of the radio galaxy Centaurus A. The resolved {gamma}-ray image shows the lobes clearly separated from the central active source. In contrast to all other active galaxies detected so far in high-energy {gamma}-rays, the lobe flux constitutes a considerable portion (greater than one-half) of the total source emission. The {gamma}-ray emission from the lobes is interpreted as inverse Compton–scattered relic radiation from the cosmic microwave background, with additional contribution at higher energies from the infrared-to-optical extragalactic background light. These measurements provide {gamma}-ray constraints on the magnetic field and particle energy content in radio galaxy lobes, as well as a promising method to probe the cosmic relic photon fields.< Réduire
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