Speaker
Description
Microquasars have been shown to be capable to accelerate particles to energies well above 100~TeV. The reported presence of hadronic particles in their jets makes them one of the most convincing PeVatron candidates. Their proximity to Earth allows detailed studies of their morphology, providing unique laboratories for the study of particle acceleration in jets. The LHAASO Observatory has reported the detection of TeV emission from 5 microquasar systems, and in particular, photons of up to 800 TeV from the microquasar V4641 Sgr. In this contribution we present the result of several years of H.E.S.S. observation of this source. While it is clear that V4641 Sgr is one of the most powerful and efficient particle accelerators in our Galaxy, many questions remain around the system. It is unclear whether the emission is leptonic or hadronic, how the extended gamma-ray emission relates to the reported low-inclination jets and where exactly in the system does particle acceleration take place. With the increased angular resolution of H.E.S.S. we are able to study in detail the spectral and morphological properties of the TeV emission around this intriguing system and tackle these questions. Understanding how particles are accelerated in the jets of V4641 Sgr would not only provide valuable insights to the study of particle acceleration in jets in general but also constrain the relative contribution of microquasars as a class to the observed cosmic ray spectrum.
| Collaboration(s) | H.E.S.S. |
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