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Title: FERMI LARGE AREA TELESCOPE DETECTION OF SUPERNOVA REMNANT RCW 86

Using 5.4 yr Fermi Large Area Telescope data, we report the detection of GeV γ-ray emission from the shell-type supernova remnant RCW 86 (G315.4-2.3) with a significance of ∼5.1σ. The data slightly favors an extended emission of this supernova remnant. The spectral index of RCW 86 is found to be very hard, Γ ∼ 1.4, in the 0.4-300 GeV range. A one-zone leptonic model can well fit the multi-wavelength data from radio to very high energy γ-rays. The very hard GeV γ-ray spectrum and the inferred low gas density seem to disfavor a hadronic origin for the γ-rays. The γ-ray behavior of RCW 86 is very similar to several other TeV shell-type supernova remnants, e.g., RX J1713.7-3946, RX J0852.0-4622, SN 1006, and HESS J1731-347.
Authors:
 [1] ; ;  [2] ;  [3]
  1. Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China)
  2. Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China)
  3. Department of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154 (United States)
Publication Date:
OSTI Identifier:
22365903
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 785; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMIC PHOTONS; GAMMA DETECTION; GAMMA RADIATION; GAMMA SPECTRA; GEV RANGE; HADRONS; INDEXES; PHOTON EMISSION; SUPERNOVA REMNANTS; TELESCOPES; TEV RANGE; WAVELENGTHS; ZONES