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We report on gamma-ray observations of the supernova remnant (SNR) RXJ0852.0-4622 with the Large Area Telescope (LAT) aboard the Fermi Gamma-raySpace Telescope. In the Fermi LAT data, we find a spatially extended source atthe location of the SNR. The extension is consistent with the SNR size seen inother wavelengths such as X-rays and TeV gamma rays, leading to theidentification of the gamma-ray source with the SNR. The spectrum is welldescribed 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 theTeV energy band. We discuss the gamma-ray emission mechanism based onmultiwavelength data. The broadband data can be fit well by a model in whichthe gamma rays are of hadronic origin. We also consider a scenario with inverseCompton scattering of electrons as the emission mechanism of the gamma rays.Although the leptonic model predicts a harder spectrum in the Fermi LAT energyrange, the model can fit the data considering the statistical and systematicerrors.

Gamma-Ray Observations of the Supernova Remnant RX J0852.0-4622 with the Fermi LAT