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

Abstract : 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.
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http://hal.in2p3.fr/in2p3-00656612
Contributor : Nathalie Martin <>
Submitted on : Wednesday, January 4, 2012 - 3:50:24 PM
Last modification on : Wednesday, May 13, 2020 - 6:20:04 PM

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T. Tanaka, A. Allafort, Jean Ballet, S. Funk, F. Giordano, et al.. Gamma-Ray Observations of the Supernova Remnant RX J0852.0-4622 with the Fermi LAT. Astrophysical Journal Letters, IOP Science, 2011, 740, pp.L51. ⟨10.1088/2041-8205/740/2/L51⟩. ⟨in2p3-00656612⟩

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