Fermi-LAT and WMAP Observations of the Puppis A Supernova Remnant
- NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
- Max Planck Inst. for Nuclear Physics, Heidelberg (Germany); Heidelberg Univ. (Germany)
- Univ. of Bordeaux 1, Gradignan (France). Bordeaux-Gradignan Center of Nuclear Studies
- Alternative Energies and Atomic Energy Commission (CEA), Saclay (France). Astrophysics Service. CEA-IRFU/CNRS/Paris Diderot Univ. Lab. AIM
- Stanford Univ., CA (United States). Dept. of Physics. W. W. Hansen Experimental Physics Lab.; SLAC National Accelerator Lab., Menlo Park, CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology
In this paper, 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 of Wilkinson Microwave Anisotropy Probe data to extend the radio spectrum up to 93 GHz. Finally, 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 W CR ≈ (1-5) × 1049 erg.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE; National Aeronautics and Space Administration (NASA); European Union (EU)
- Contributing Organization:
- Fermi-LAT Collaboration
- Grant/Contract Number:
- AC02-76SF00515; ERC-StG-259391
- OSTI ID:
- 1356666
- Journal Information:
- The Astrophysical Journal, Vol. 759, Issue 2; ISSN 0004-637X
- Publisher:
- Institute of Physics (IOP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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