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Conference Paper

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

MPS-Authors

Di Tria,  R.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Di Venere,  L.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Giordano,  F.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Green,  D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Hahn,  A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Pantaleo,  F.R.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

et al., 
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

Di Tria, R., Di Venere, L., Giordano, F., Green, D., Hahn, A., Pantaleo, F., et al. (2021). Analysis of the W 44 Supernova Remnant and its surroundings with Fermi-LAT and MAGIC. Proceedings of Science, 395, 642.


Cite as: https://hdl.handle.net/21.11116/0000-000A-1B76-4
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. We present a detailed analysis of the W 44 region as seen by Fermi-LAT, focusing on the spatial and spectral characteristics of both W44 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 north-western region of W 44, also known as SRC-1 from previous works, were conducted with the MAGIC telescopes in the very high-energy gamma-ray band. 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.