Observation of Supernova Remnant IC443 with the Fermi Large Area Telescope
A.A. Abdo, et al. (Fermi Large Area Telescope Collaboration)

TL;DR
This paper reports detailed gamma-ray observations of supernova remnant IC443 using the Fermi LAT, revealing extended emission consistent with cosmic-ray acceleration and pion decay, and clarifying the emission's spatial and spectral properties.
Contribution
First detailed gamma-ray characterization of IC443 with broad energy coverage, linking gamma-ray emission to cosmic-ray acceleration and pion decay processes.
Findings
Gamma-ray emission region is extended and overlaps with TeV sources.
The gamma-ray spectrum is consistent with pion decay from a broken power-law proton spectrum.
The centroid displacement suggests the PWN is not the main gamma-ray source.
Abstract
We report observation of the supernova remnant IC443 (G189.1+3.0) with the Fermi Gamma-ray Space Telescope Large Area Telescope (LAT) in the energy band between 200MeV and 50GeV. IC443 is a shell-type supernova remnant with mixed morphology located off the outer Galactic plane where high-energy emission has been detected in the X-ray, GeV and TeV gamma-ray bands. Past observations suggest IC443 has been interacting with surrounding interstellar matter. Proximity between dense shocked molecular clouds and GeV-TeV gamma-ray emission regions detected by EGRET, MAGIC and VERITAS suggests an interpretation that cosmic-ray (CR) particles are accelerated by the SNR. With the high gamma-ray statistics and broad energy coverage provided by the LAT, we accurately characterize the gamma-ray emission produced by the CRs accelerated at IC443. The emission region is extended in the energy band with…
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