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Fermi Gamma-Ray Imaging of a Radio Galaxy

A. A. Abdo Markus Ackermann Marco Ajello W. B. Atwood Luca Baldini Jean Ballet 1 Guido Barbiellini D. Bastieri B. M. Baughman K. Bechtol R. Bellazzini 1 B. Berenji R. D. Blandford E. D. Bloom E. Bonamente A. W. Borgland J. Bregeon 2 A. Brez M. Brigida Pascal Bruel 3 T. H. Burnett S. Buson G. A. Caliandro R. A. Cameron P. A. Caraveo J. M. Casandjian 1 E. Cavazzuti C. Cecchi Ö. Çelik A. Chekhtman C. C. Cheung J. Chiang S. Ciprini R. Claus J. Cohen-Tanugi 4 S. Colafrancesco L. R. Cominsky J. Conrad L. Costamante 5 S. Cutini D. S. Davis C. D. Dermer A. de Angelis F. de Palma S. W. Digel E. Do Couto E Silva P. S. Drell R. Dubois D. Dumora 2 C. Farnier 4 C. Favuzzi S. J. Fegan 3 J. Finke W. B. Focke P. Fortin 3 Y. Fukazawa S. Funk P. Fusco F. Gargano D. Gasparrini N. Gehrels M. Georganopoulos S. Germani B. Giebels 3 N. Giglietto F. Giordano M. Giroletti T. Glanzman G. Godfrey I. A. Grenier 1 J. E. Grove L. Guillemot 2 S. Guiriec 4 Y. Hanabata A. K. Harding M. Hayashida E. Hays R. E. Hughes M. S. Jackson G. Jóhannesson A. S. Johnson T. J. Johnson W. N. Johnson T. Kamae H. Katagiri J. Kataoka N. Kawai M. Kerr J. Knödlseder 5 M. L. Kocian M. Kuss J. Lande L. Latronico M. Lemoine-Goumard 2 F. Longo F. Loparco B. Lott 2 M. N. Lovellette P. Lubrano G. M. Madejski A. Makeev M. N. Mazziotta W. Mcconville J. E. Mcenery C. Meurer P. F. Michelson W. Mitthumsiri T. Mizuno A. A. Moiseev C. Monte M. E. Monzani A. Morselli I. V. Moskalenko S. Murgia P. L. Nolan J. P. Norris E. Nuss 4 T. Ohsugi N. Omodei E. Orlando J. F. Ormes D. Paneque D. Parent 2 V. Pelassa 4 M. Pepe M. Pesce-Rollins F. Piron 4 T.A. Porter S. Rainò R. Rando M. Razzano S. Razzaque A. Reimer O. Reimer T. Reposeur 2 S. Ritz L. S. Rochester A. Y. Rodriguez R. W. Romani M. Roth F. Ryde H. F.-W. Sadrozinski R. Sambruna D. Sanchez 3 A. Sander P. M. Saz Parkinson J. D. Scargle 1 C. Sgrò 3 E. J. Siskind David Stanley Smith 2 P. D. Smith G. Spandre P. Spinelli Jean-Luc Starck 1 . Stawarz M. S. Strickman D. J. Suson H. Tajima H. Takahashi T. Takahashi T. Tanaka J. B. Thayer J. G. Thayer D. J. Thompson L. Tibaldo 1 D. F. Torres G. Tosti A. Tramacere Y. Uchiyama T. L. Usher V. Vasileiou N. Vilchez 5 V. Vitale A. P. Waite E. Wallace P. Wang B. L. Winer K. S. Wood T. Ylinen M. Ziegler M. J. Hardcastle D. Kazanas
Abstract : 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.
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Submitted on : Tuesday, May 18, 2010 - 3:15:12 PM
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A. A. Abdo, Markus Ackermann, Marco Ajello, W. B. Atwood, Luca Baldini, et al.. Fermi Gamma-Ray Imaging of a Radio Galaxy. Science, American Association for the Advancement of Science, 2010, 328, pp.725-729. ⟨10.1126/science.1184656⟩. ⟨in2p3-00484510⟩

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