PoS - Proceedings of Science
Volume 395 - 37th International Cosmic Ray Conference (ICRC2021) - GAD - Gamma Ray Direct
Probing the hadronic nature of the gamma-ray emission associated with Westerlund 2
E.M. de Ona Wilhelmi*, E. Mestre, D.F. Torres, T.L. Holch, U. Schwanke, F. Aharonian, P. Saz-Parkinson, R. Yang and R. Zanin
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Pre-published on: July 15, 2021
Published on: March 18, 2022
Star-forming regions have been proposed as potential Galactic cosmic-ray accelerators for decades.
Cosmic ray acceleration can be probed through observations of gamma-rays produced in inelastic
proton-proton collisions, at GeV and TeV energies. We analyze more than 11 years of Fermi-LAT
data from the direction of Westerlund 2, one of the most massive and best-studied star-forming
regions in our Galaxy. The spectral and morphological characteristics of the LAT source agree
with the ones in the TeV regime (HESS J1023-575), allowing the description of the gamma-ray
source from a few hundreds of MeV to a few tens of TeVs. We will present the results and discuss
the implications of the identification with the stellar cluster and the radiation mechanism involved.
DOI: https://doi.org/10.22323/1.395.0612
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