TOSCA - Topical Overview on Star Cluster Astrophysics

Session

Particle acceleration and propagation

29 Oct 2024, 09:00

Siena, Santa Chiara Lab

Conveners

Particle acceleration and propagation

• Elena Amato (Istituto Nazionale di Astrofisica (INAF))

9. Review on Galactic cosmic rays

Stefano Gabici

29/10/2024, 09:00

I will try to provide a brief and critical review of the standard paradigm for the origin of Galactic cosmic rays. Recent measurements of local and far-away cosmic rays reveal unexpected behaviours, which challenge the commonly accepted scenario. These recent findings will be discussed, together with long-standing open issues. Despite the progress made thanks to ever-improving observational...

17. Stellar wind interaction around young star clusters: 3D MHD simulations

Lucia Härer

29/10/2024, 09:40

The environments of young star clusters are shaped by the interaction of the powerful winds of massive stars and their feedback on the cluster birth cloud. Several such regions show diffuse TeV gamma-ray emission on the degree scale, which hints at ongoing particle acceleration. To date, particle acceleration and transport in star cluster environments are not well understood. A...

18. Deciphering the Cygnus region

Thibault Vieu (Max-Planck-Institut für Kernphysik)

29/10/2024, 10:10

The Cygnus region has become a gamma-ray source of prime interest since the detection of ultra-high energy photons by LHAASO. This likely indicates the presence of a hadronic source of PeV cosmic rays in the region, although the accelerator has not been yet identified. In this talk, I will summarize our knowledge of this star-forming complex and, using large-scale hydrodynamic simulations, I...

19. Gamma-rays from star clusters and their implication for Galactic cosmic rays

Prof. Pasquale Blasi

29/10/2024, 10:40

I will discuss acceleration and transport of nuclei in star clusters and their escape from the bubble, with particular focus on the modification of the spectra of nuclei accelerated at the termination shock. The recently detected gamma ray emission from the Cygnus region allows us to infer some general conclusions concerning the role of star clusters as contributors to the flux of Galactic cosmic rays.

20. Superbubbles as Galactic PeVatrons: The Potential Role of Rapid Second-Order Fermi Acceleration

Jacco VInk

29/10/2024, 11:40

Superbubbles are now one of the few remaining potential PeVatron candidates in the Galaxy, based on the identification of the Cygnus Cocoon as a LHAASO identified PeVatron and Westerlund 1 as a very powerful TeV gamma-ray source with a large shell-like morphology. At the moment, it is not clear how superbubbles accelerate particles to PeV energies. Recent focus has been on the role of the...

21. Cosmic rays from Galactic star clusters

Satyendra Thoudam

29/10/2024, 12:10

In this contribution, I will discuss about a model for the production of cosmic rays from massive, young star clusters present in the Galaxy. I will show that cosmic-ray acceleration at the shocks associated with fast stellar winds of star clusters can produce significant contribution in cosmic rays at energies ~ 10^16 - 10^18 eV. When combined with the contribution from regular supernova...

16. Multimessanger astrophysics from SCs

Silvia Celli (Sapienza University of Rome & INFN)

29/10/2024, 12:40