Thibault Vieu | Clustered supernovae as the sources of galactic cosmic rays at very-high energies

Friday 17 Mar 2023, 10:00 → 12:00 Europe/Berlin

SR 05 + Zoomland (Villa)

Although supernova remnants are believed to be the most plausible sources of galactic cosmic rays, it is yet unclear how they can accelerate particles beyond 1 PeV, especially when they evolve in the warm phase of the interstellar medium (ISM). On the other hand, extra-galactic sources are not expected to contribute below hundreds of PeV. This indicates a glaring gap in our understanding of the cosmic ray spectrum observed near the Earth. Intriguingly,  most supernovae do not occur in the warm ISM but rather in hot cavities blown by powerful star clusters, which are in particular expected to generate strong magnetic fields. In this talk I will show how taking into account particle acceleration around supernova remnants expanding in the vicinity of young massive star cluster cores can complement the current paradigm to model the origin of galactic cosmic rays up to several hundreds of PeV.