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FERMI-LAT AND WMAP OBSERVATIONS OF THE PUPPIS A SUPERNOVA REMNANT

Abstract : We report the detection of GeV γ -ray emission from the supernova remnant (SNR) Puppis A with the Fermi Gamma-Ray Space Telescope. Puppis A is among the faintest SNRs yet detected at GeV energies, with a luminosity of only 2.7×1034 (D/2.2 kpc)2 erg s−1 between 1 and 100 GeV. The γ -ray emission from the remnant is spatially extended, with a morphology matching that of the radio and X-ray emission, and is well described by a simple power law with an index of 2.1.We attempt to model the broadband spectral energy distribution (SED), from radio to γ -rays, using standard nonthermal emission mechanisms. To constrain the relativistic electron population we use 7 years ofWilkinsonMicrowave Anisotropy Probe data to extend the radio spectrum up to 93 GHz.Both leptonic- and hadronic-dominated models can reproduce the nonthermal SED, requiring a total content of cosmic-ray electrons and protons accelerated in Puppis A of at least WCR ≈ (1-5) × 1049 erg.
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http://hal.in2p3.fr/in2p3-00767681
Contributor : Nathalie Martin <>
Submitted on : Thursday, December 20, 2012 - 11:43:54 AM
Last modification on : Saturday, April 11, 2020 - 1:53:36 AM

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J. W. Hewitt, M.-H. Grondin, M. Lemoine-Goumard, T. Reposeur, Jean Ballet, et al.. FERMI-LAT AND WMAP OBSERVATIONS OF THE PUPPIS A SUPERNOVA REMNANT. The Astrophysical Journal, American Astronomical Society, 2012, 759, pp.89. ⟨10.1088/0004-637X/759/2/89⟩. ⟨in2p3-00767681⟩

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