The young massive stellar cluster Westerlund 1 in \(\gamma\) rays as seen with H.E.S.S

Massive stellar clusters have recently been hypothesised as candidates for the acceleration of hadronic cosmic rays up to PeV energies. Previously, the H.E.S.S. Collaboration has reported about very extended \(\gamma\)-ray emission around Westerlund 1, a massive young stellar cluster in the Milky Wa...

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Bibliographic Details
Published in:arXiv.org 2021-08
Main Authors: Mohrmann, Lars, Specovius, Andreas, Rauth, Romed, Ohm, Stefan, Christopher van Eldik, the H E S S Collaboration
Format: Article
Language:English
Subjects:
Cosmic rays
Emission analysis
Energy spectra
Gamma rays
Morphology
Star clusters
Three dimensional analysis
Online Access:Get full text
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Summary:Massive stellar clusters have recently been hypothesised as candidates for the acceleration of hadronic cosmic rays up to PeV energies. Previously, the H.E.S.S. Collaboration has reported about very extended \(\gamma\)-ray emission around Westerlund 1, a massive young stellar cluster in the Milky Way. In this contribution we present an updated analysis that employs a new analysis technique and is based on a much larger data set, allowing us to constrain better the morphology and the energy spectrum of the emission. The analysis technique used is a three-dimensional likelihood analysis, which is especially well suited for largely extended sources. The origin of the \(\gamma\)-ray emission will be discussed in light of multi-wavelength observations.
ISSN:2331-8422
DOI:10.48550/arxiv.2108.03003