The GeV to TeV view of SNR IC443: predictions for Fermi

TL;DR

This paper presents a theoretical model explaining high-energy gamma-ray observations of SNR IC 443, predicting how Fermi telescope data can test the model's validity and improve understanding of cosmic-ray interactions.

Contribution

The paper introduces a novel model linking TeV and GeV gamma-ray emissions from SNR IC 443 with cosmic-ray diffusion and cloud interactions, providing testable Fermi predictions.

Findings

MAGIC J0616+225 is explained as delayed TeV emission from cosmic-ray diffusion.

The model accounts for the spatial displacement and spectral differences between EGRET and MAGIC sources.

Predictions are made for Fermi observations to validate the model.

Abstract

We present a theoretical model that explains the high energy phenomenology of the neighborhood of SNR IC 443, as observed with the Major Atmospheric Gamma Imaging Cherenkov (MAGIC) telescope and the Energetic Gamma-Ray Experiment Telescope (EGRET). We also discuss how the model can be tested with observations by the Fermi Gamma-ray Large Area Space Telescope. We interpret MAGIC J0616+225 as delayed TeV emission of cosmic-rays diffusing from IC 443 and interacting with a known cloud located at a distance of about 20 pc in the foreground of the remnant. This scenario naturally explains the displacement between EGRET and MAGIC sources, their fluxes, and their spectra. Finally, we predict how this context can be observed by Fermi.