Characterization of the Gamma-ray Emission from the Kepler Supernova Remnant with Fermi-LAT - Centre d'Etudes Nucléaires de Bordeaux Gradignan Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2022

Characterization of the Gamma-ray Emission from the Kepler Supernova Remnant with Fermi-LAT

Résumé

The Kepler supernova remnant (SNR) had been the only historic SNR that lacked a detection at GeV and TeV energies, which probe particle acceleration. A recent analysis of Fermi-LAT data reported a likely GeV γ-ray candidate in the direction of the SNR. Using approximately the same data set but with an optimized analysis configuration, we confirm the γ-ray candidate to a solid >6σ detection and report a spectral index of 2.14 ± 0.12stat ± 0.15syst for an energy flux above 100 MeV of (3.1 ± 0.6stat ± 0.3syst) × 10−12 erg cm−2 s−1. The γ-ray excess is not significantly extended and is fully compatible with the radio, infrared, and X-ray spatial distribution of the SNR. We successfully characterized this multiwavelength emission with a model in which accelerated particles interact with the dense circumstellar material in the northwest portion of the SNR and radiate GeV γ rays through π° decay. The X-ray synchrotron and inverse-Compton emission mostly stem from the fast shocks in the southern regions with a magnetic field B ~ 100 μG or higher. Depending on the exact magnetic field amplitude, the TeV γ-ray emission could arise from either the south region (inverse-Compton dominated) or the interaction region (π° decay dominated).
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Dates et versions

hal-03655723 , version 1 (29-04-2022)

Identifiants

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F. Acero, M. Lemoine-Goumard, J. Ballet. Characterization of the Gamma-ray Emission from the Kepler Supernova Remnant with Fermi-LAT. Astronomy and Astrophysics - A&A, 2022, 660, pp.A129. ⟨10.1051/0004-6361/202142200⟩. ⟨hal-03655723⟩
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