Fermi Gamma-ray Space Telescope

HAWC's View on Supernova Remnants

Henrike Fleischhack


Supernova Remnants (SNRs) have long been postulated to be the main sources of Galactic Cosmic Rays (CRs) up to the knee. However, while some SNRs have been shown to be CR accelerators, none of them have been confirmed to accelerate CRs beyond hundreds of TeV. The TeV gamma-ray emission from SNRs provides important information about the maximum energies to which CRs are being accelerated in SNRs. In this presentation, we will give an overview of recent measurements of TeV gamma-ray emission from SNRs with the High-Altitude Water Cherenkov (HAWC) Observatory, and their multiwavelength counterparts. Special focus will be placed on the gamma Cygni SNR, a middle-aged shell-type SNR in the Cygnus region. The gamma-ray spectrum of the gamma Cygni SNR displays a pronounced break between GeV and TeV energies. We will show how a joint fit to HAWC and the Fermi-LAT data can constrain particle acceleration in this remnant.