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TOSCA - Topical Overview on Star Cluster Astrophysics

28–31 Oct 2024
Siena, Santa Chiara Lab
UTC timezone

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Contribution List

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  1. 10. Review Gamma Rays
    Dr Luigi Tibaldo (IRAP)
    28/10/2024, 14:35
  2. 12. Recent results on Stellar clusters as detected by HESS
    Lars Mohrmann
    28/10/2024, 15:15
  3. 13. Young massive clusters with Fermi-LAT
    Giada Peron (Istituto Nazionale di Astrofisica (INAF))
    28/10/2024, 15:45
  4. 11. Overview of the Cygnus OB2 region in gamma-rays
    ruizhi yang
    28/10/2024, 16:35
  5. 14. Population studies of SCs derived from Fermi-LAT observations
    Ava Webber (Clemson University)
    28/10/2024, 17:05
  6. 15. Prospect for gamma-ray detection of Galactic stellar clusters
    Alison Mitchell (Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg)
    28/10/2024, 17:35
  7. 22. Aluminium-26 from massive star clusters: theory and observations
    Roland Diehl
    28/10/2024, 18:05
  8. 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...

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  9. 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...

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  10. 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...

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  11. 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.

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  12. 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...

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  13. 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...

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  14. 16. Multimessanger astrophysics from SCs
    Silvia Celli (Sapienza University of Rome & INFN)
    29/10/2024, 12:40
  15. 6. Isolated massive star candidates in nearby star forming galaxies
    Pietro Facchini (Zentrum für Astronomie der Universität Heidelberg, Astronomisches Rechen-Institut)
    29/10/2024, 14:40

    The debate on whether star formation of massive stars always occurs clustered or could also happen in isolation is still open. Although small in numbers, massive stars strongly affect the environment around them: they can stop or trigger star formation, reshape the distribution of the gas around them and enrich the ISM due to supernova events or stellar winds. Thus, understanding how...

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  16. 3. Gamma-ray signatures of particle acceleration at stellar wind termination shocks up to PeV energies
    Alexandre INVENTAR (APC Laboratory)
    29/10/2024, 14:45

    Young massive stellar clusters have recently brought attention as PeVatrons candidates, to explain the knee of the cosmic ray spectrum and how protons can be accelerated to such energy scale in galactic sources. The new detector LHAASO is the first to probe well the photon detection band >0.1 PeV, that can correspond to multi-PeV hadronic cosmic rays. Thus, it enables the use of its gamma-ray...

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  17. 23. Young massive star clusters as Galactic PeVatrons
    Alberto Bonollo (Istituto Nazionale di Astrofisica (INAF))
    29/10/2024, 14:50
  18. 2. Constraining the Diffusion Coefficient and Cosmic-Ray Acceleration Efficiency using Gamma-ray Emission from the Star-Forming Region RCW 38
    Paarmita Pandey (The Ohio State University)
    29/10/2024, 14:55

    We report a detailed study of gamma-ray emission near the young Milky Way star cluster (0.5 Myr old) in the star-forming region RCW 38. Using 15 years of data from the Fermi-LAT, we find a significant (σ>22) detection coincident with the cluster, producing a total gamma-ray luminosity of L = (2.66±0.92) x 10^34 erg s^-1 adopting a power-law spectral model (Γ=2.34±0.04) in the 0.1-500 GeV band....

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  19. 8. Creating a Hydrodynamic simulation of Cygnus OB2
    Cormac Larkin (MPI Kernphysik/ARI)
    29/10/2024, 15:00

    The Cygnus X star-forming region has been of great interest to the high-energy astrophysics community due to the diffuse gamma-ray emission detected by Fermi, HAWC and LHASSO in recent years. At the heart of this region lies the OB association Cygnus OB2, with tens of powerful O stars and 3 Wolf-Rayet stars. It has been argued that efficient stellar wind interactions in the vicinity of massive...

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  20. 5. Protostellar Jets as Particle Accelerators. The case of HH 80-81.
    Javier Méndez-Gallego (IAA-CSIC)
    29/10/2024, 15:05

    Massive stars are capable to accelerate particles due to their powerful winds ejected during the main sequence and post-main sequence evolutionary stages. However, recent studies on massive young stellar objects with Fermi-LAT have demonstrated that collimated jets, created by the protostars while they are still accreting mass, can produce a significant amount of accelerated particles even...

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  21. 24. Review Stellar Feedback
    Anna Rosen (San Diego State University)
    29/10/2024, 15:10
  22. 25. Stellar wind bubbles
    Lachlan Lanchaster
    29/10/2024, 15:50
  23. 26. Simulations of stellar feedback
    Ahmad Ali
    29/10/2024, 16:20
  24. 30. Observations of HII regions
    Loren Anderson
    29/10/2024, 17:10
  25. 29. Dynamic of HII regions
    Christopher Matzner (University of Toronto)
    29/10/2024, 17:40
  26. 27. Cosmic-ray feedback
    Philipp Girichidis
    29/10/2024, 18:10
  27. 28. Cosmic ray-driven astrochemistry
    Brandt Gaches
    29/10/2024, 18:40
  28. 31. Review Stellar Wind Physics -1
    Jon Sundqvist
    30/10/2024, 09:00
  29. 32. Review: Wolf-Rayet winds
    Andreas Sander
    30/10/2024, 09:35
  30. 33. Winds from very massive stars
    Gautham Sabhahit
    30/10/2024, 10:10
  31. 34. Colliding Winds and non-Thermal emission
    Julian Pittard
    30/10/2024, 10:40
  32. 35. Stellar wind simulations and bow shocks
    Jonathan Mackey
    30/10/2024, 11:40
  33. 36. X-rays from the Winds of Massive Stars
    Stan Owocki
    30/10/2024, 12:10
  34. 37. Stellar Physics and the Chemical Enrichment of the ISM from Massive Stars
    Marco Limongi (Istituto Nazionale di Astrofisica (INAF))
    30/10/2024, 12:40
  35. 38. Review Population properties
    Elena Sabbi
    31/10/2024, 09:00
  36. 39. Why are some massive stars found in clusters and some in OB associations?
    Jesús Maíz Apellániz
    31/10/2024, 09:40
  37. 40. Massive stars in OB associations
    Sara Berlanas
    31/10/2024, 10:10
  38. 4. A census of OB stars within 1 kpc and the star formation and core collapse supernova rates of the Milky Way
    Alexis Quintana (University of Alicante)
    31/10/2024, 10:40

    O- and B-type stars constitute valuable tools across many areas of astronomy. They are significant sources of stellar feedback, through which they enrich the interstellar medium in new chemical elements, but also contribute to and hinder the emergence of future generations of stars. Being short-lived, they tend to remain near their birth environment, and thereby are vital tracers of the...

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  39. 41. Massive stars ejected from clusters
    Sally Oey
    31/10/2024, 11:40
  40. 42. X-ray observations of massive star clusters
    Mario Giuseppe Guarcello (Istituto Nazionale di Astrofisica (INAF))
    31/10/2024, 12:10
  41. 43. The life cycle of star clusters in low-metallicity dwarf galaxies
    Natalia Lahen
    31/10/2024, 12:40

    The earliest known proto-globular clusters (GCs) detected with the James
    Webb Space Telescope were compact (effective radii ~parsecs) and
    extremely dense, ideal to harbour energetic massive stars and possibly
    intermediate mass black holes. The detailed conditions and time-scales
    of star formation and stellar feedback during the earliest stages of
    galaxy assembly are however still unclear....

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