Cosmic Dawn at High Latitudes

Datum: 2024-06-24 09:00 - 2024-06-28 17:00

Adress: The Royal Swedish Academy Of Sciences, 4 A, Lilla Frescativägen, Stockholm

Lokal: The Beijer Hall

Sista anmälningsdatum: 2024-05-03 10:00

The Cosmic Dawn is the era when the first stars and galaxies formed and which set in motion a series of fundamental changes in our Universe. This Nordita program is dedicated to studies of these early galaxies and how they changed the matter between them, the intergalactic medium, from cold and neutral to hot and ionized in a process called reionization. The program considers both the properties of the galaxies and the properties of the intergalactic medium. This allows us to address how on the one hand studies of galaxies can answer questions about the evolution of the intergalactic medium, both before and during reionization, and how on the other hand studies of the intergalactic medium can improve our understanding of the formation and evolution of galaxies. In this context, the program will address the implications of the latest observations, such as by the James Webb Space Telescope (JWST) and various 21-cm experiments, expectations for future observations, as well as the latest developments in modelling the processes during the Cosmic Dawn and the use of these in interpreting the observational results.

The conference will focus on the following four themes:

  1. When & how did reionization take place? Evolution of the mean ionized fraction; evolution of ionized bubble sizes; evolution of neutral islands; measuring these quantities. 

  2. Sources & sinks of reionization: Production & escape of ionizing photons; absorption of ionizing photons in the intergalactic medium; absorption of ionizing photons at large and small scales. 
  3. Physical properties of high redshift galaxies. What have we learned from JWST, ALMA, etc.? What can we learn from low redshift analogues? What do simulations tell us?
  4. What happened before reionization really started? Early star formation; Pop III stars; early X-ray sources; cosmology

Invited speakers

  • Benedetta Ciardi
  • Danielle Berg
  • Frederick Davies
  • Yuichi Harikane
  • Laura Keating
  • Joakim Rosdahl
  • Dan Stark

Sambit Giri, Matthew Hayes, Anne Hutter, Charlotte Mason, Garrelt Mellema, Göran Östlin, Sune Toft

The symposium is supported by Royal Swedish Academy of Sciences, Wenner-Gren Foundations and Nordita

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