Fermi-LAT Observation of Supernova Remnant S147

Abstract

We present an analysis of gamma-ray data obtained with the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope in the region around SNR S147 (G180.0-1.7). A spatially extended gamma-ray source detected in an energy range of 0.2--10 GeV is found to coincide with SNR S147. We confirm its spatial extension at >5sigma confidence level. The gamma-ray flux is (3.8 \pm 0.6) x 10^{-8} photons cm^{-2} s^{-1}, corresponding to a luminosity of 1.3 x 10^{34} (d/1.3 kpc)^2 erg s^{-1} in this energy range. The gamma-ray emission exhibits a possible spatial correlation with prominent Halpha filaments of S147. There is no indication that the gamma-ray emission comes from the associated pulsar PSR J0538+2817. The gamma-ray spectrum integrated over the remnant is likely dominated by the decay of neutral pi mesons produced through the proton--proton collisions in the filaments. Reacceleration of pre-existing CRs and subsequent adiabatic compression in the filaments is sufficient to provide the required energy density of high-energy protons.

12 pages, accepted for publication in ApJ

References in corpus (4)

• Inverse Compton Origin of the Hard X-Ray and Soft Gamma-Ray Emission from the Galactic Ridge
• Fermi Large Area Telescope Observations of the Supernova Remnant G8.7-0.1
• Fermi Large Area Telescope Observations of the Cygnus Loop Supernova Remnant
• Sub-luminous gamma-Ray pulsars

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• Evolution of high-energy particle distribution in Supernova Remnants
• The Supernova Remnant W44: confirmations and challenges for cosmic-ray acceleration
• Discovery of an OB Runaway Star Inside SNR S147
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• Mapping the three-dimensional dust extinction toward the supernova remnant S147 - the S147 dust cloud
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• Is the Birth of PSR J0538+2817 Accompanied by a Gamma-ray Burst?
• Mapping the emission line strengths and kinematics of Supernova Remnant S147 with extensive LAMOST spectroscopic observations
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• Cross-match between the latest Swift-BAT and Fermi-LAT catalogs
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• Study of X-ray emission from the S147 nebula with SRG/eROSITA: X-ray imaging, spectral characterization, and a multiwavelength picture
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