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Fermi-LAT and WMAP observations of the supernova remnant Puppis A

Published online by Cambridge University Press:  29 January 2014

Marie-Hélène Grondin
Affiliation:
Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse (UPS)/OMP, F-31028 Toulouse Cedex 4, France E-mail: mgrondin@irap.omp.eu
John W. Hewitt
Affiliation:
NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
Marianne Lemoine-Goumard
Affiliation:
Centre dÉtudes Nucléaires de Bordeaux-Gradignan, Université Bordeaux 1, CNRS/IN2p3, F-33175 Gradignan, France Funded by contract ERC-StG-259391 from the European Community
Thierry Reposeur
Affiliation:
Centre dÉtudes Nucléaires de Bordeaux-Gradignan, Université Bordeaux 1, CNRS/IN2p3, F-33175 Gradignan, France
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Abstract

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The supernova remnant (SNR) Puppis A (aka G260.4-3.4) is a middle-aged supernova remnant, which displays increasing X-ray surface brightness from West to East corresponding to an increasing density of the ambient interstellar medium at the Eastern and Northern shell. The dense IR photon field and the high ambient density around the remnant make it an ideal case to study in γ-rays. Gamma-ray studies based on three years of observations with the Large Area Telescope (LAT) aboard Fermi have revealed the high energy gamma-ray emission from SNR Puppis A. The γ-ray emission from the remnant is spatially extended, and nicely matches the radio and X-ray morphologies. Its γ-ray spectrum is well described by a simple power law with an index of ~2.1, and it is among the faintest supernova remnants yet detected at GeV energies. To constrain the relativistic electron population, seven years of Wilkinson Microwave Anisotropy Probe (WMAP) data were also analyzed, and enabled to extend the radio spectrum up to 93 GHz. The results obtained in the radio and γ-ray domains are described in detail, as well as the possible origins of the high energy γ-ray emission (Bremsstrahlung, Inverse Compton scattering by electrons or decay of neutral pions produced by proton interactions).

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2014 

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