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Astrophysical Journal Letters 740 (2011) L51
Gamma-Ray Observations of the Supernova Remnant RX J0852.0-4622 with the Fermi LAT
T. Tanaka, A. Allafort, J. Ballet1, S. Funk, F. Giordano, J. Hewitt, M. Lemoine-Goumard2, H. Tajima, O. Tibolla, Y. Uchiyama
(20/10/2011)

We report on gamma-ray observations of the supernova remnant (SNR) RX J0852.0-4622 with the Large Area Telescope (LAT) aboard the Fermi Gamma-ray Space Telescope. In the Fermi LAT data, we find a spatially extended source at the location of the SNR. The extension is consistent with the SNR size seen in other wavelengths such as X-rays and TeV gamma rays, leading to the identification of the gamma-ray source with the SNR. The spectrum is well described as a power law with a photon index of Gamma = 1.85 +/- 0.06 (stat) (+0.18,-0.19) (sys), which smoothly connects to the H.E.S.S. spectrum in the TeV energy band. We discuss the gamma-ray emission mechanism based on multiwavelength data. The broadband data can be fit well by a model in which the gamma rays are of hadronic origin. We also consider a scenario with inverse Compton scattering of electrons as the emission mechanism of the gamma rays. Although the leptonic model predicts a harder spectrum in the Fermi LAT energy range, the model can fit the data considering the statistical and systematic errors.
1 :  AIM - UMR 7158 - Astrophysique Interactions Multi-échelles
2 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
GLAST
Physique/Astrophysique/Phénomènes cosmiques de haute energie

Planète et Univers/Astrophysique/Phénomènes cosmiques de haute energie