The SNR Puppis A Revisited with Seven Years of Fermi Large Area Telescope Observations

Abstract

Puppis A is a very famous and extensively studied supernova remnant (SNR) that shows strong evidence of shock-cloud interaction. We re-analyze the GeV $\gamma$-ray emission of it using seven years Pass 8 data recorded by the Fermi Large Area Telescope (Fermi-LAT). The morphology of the $\gamma$-ray emission is more compatible with that of the thermal X-ray and IR emissions than the radio image, which suggests a possible correlation between the gamma-ray emitting region and dense clouds. The $\gamma$-ray spectrum in the energy range of 1-500 GeV shows a break at $7.92\pm 1.91$ GeV with the photon indices of $1.81\pm 0.08$ below the break and $2.53\pm 0.12$ above the break, which can naturally explain the lack of TeV $\gamma$-ray emission from Puppis A. The multi-wavelength observations favor a hadronic origin for the $\gamma$-ray emission.

9 pages, 4 figures, 4 tables, Accepted for publication in ApJ

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• Time evolution of broadband non-thermal emission from supernova remnants in different circumstellar environments
• HESS J1640-465 -- a Gamma-ray emitting pulsar wind nebula ?
• Rectangular core-collapse supernova remnants: application to Puppis A
• LMC N132D: A mature supernova remnant with a power-law gamma-ray spectrum extending beyond 8 TeV
• Molecular and Atomic Clouds Associated with the Gamma-Ray Supernova Remnant Puppis A
• A global view of shocked plasma in the supernova remnant Puppis A provided by SRG/eROSITA
• Probing the origin of 4FGL J0822.8-4207: cosmic ray illumination from the SNR Puppis A and the Herbig-Haro object HH219
• Wide-field X-ray observations of the supernova remnant Puppis A with the SRG/ART-XC telescope
• Detection of the extended $\gamma$-ray emission from the new supernova remnant G321.3-3.9 with Fermi-LAT
• Evidence for protons accelerated and escaped from the Puppis A region using \textit{Fermi}-LAT observations