Analysis of the W 44 Supernova Remnant and its surroundings with Fermi-LAT and MAGIC

Discussion timeslot (ZOOM-Meeting): 20. July 2021 - 12:00
ZOOM-Meeting URL: https://desy.zoom.us/j/98542982538
ZOOM-Meeting ID: 98542982538
ZOOM-Meeting Passcode: ICRC2021
Corresponding Session: https://icrc2021-venue.desy.de/channel/46-Supernova-Remnants-GAD-GAI-CRD/76
Live-Stream URL: https://icrc2021-venue.desy.de/livestream/Discussion-04/5

Abstract:
'The well-known supernova remnant (SNR) W 44 is observed in high-energy gamma-rays and widely studied to investigate cosmic ray (CR) acceleration. Several analyses of the W 44 surroundings showed the presence of gamma-ray emission offset from the radio SNR shell. This emission is thought to originate from escaped high-energy CRs.rnWe present a detailed analysis of the W44 region as seen by Fermi-LAT above 50 MeV, focusing on the spatial and spectral characteristics of both W 44 SNR and its surroundings. The spatial analysis was limited to energies above 1 GeV in order to exploit the improved angular resolution of the instrument, deriving a detailed description of the region morphology. Observations of the northwestern region of W44, also known as SRC-1 from previous works, were conducted with the MAGIC telescopes in the very high-energy gamma-ray band, namely above 50 GeV. We analysed MAGIC data exploiting the spatial information derived with the Fermi-LAT analysis at GeV energies. Here we show the results of both analyses and the combined Fermi-LAT and MAGIC spectra, thus obtaining constraining information on the diffusion of the escaped CRs.'

Authors: Leonardo Di Venere
Co-Authors: David Green | Riccardo Di Tria | Francesco Giordano | Alexander Hahn | Francesca Romana Pantaleo | Marcel Strzys | for the Fermi-LAT and MAGIC collaborations
Collaboration: Ferrmi-LATMAGIC

Indico-ID: 1203
Proceeding URL: https://pos.sissa.it/395/642