Jun 24 – 28, 2024
Swedish Royal Academy of Sciences
Europe/Stockholm timezone


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 is part of a Nordita program with the same title and similar to the program 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

Important dates

Conference abstract submission deadline - March 11th  
Abstract assessment - by March 29th 
Applications/Registration deadline - April 14th 
Applications assessment results, including financial support decisions - by April 30th 
Individual accommodation confirmations to relevant participants - by May 14th 
Welcome letter with practical information and directions - by June 5th

Relation Program and Conference

This conference is embedded in a Nordita program which has its own website. However, registration is shared between the program and the conference. We encourage conference attendees to become program participants in either the weeks before or the week after the conference. If you only want to attend the conference, please select week 3 when you register. 

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



Sarah Bosman  
Sambit Giri
Matthew Hayes  
Anne Hutter   
Anne Jaskot  
Matt McQuinn  
Charlotte Mason   
Garrelt Mellema  
Desika Narayanan  
Renske Smit  
Cathryn Trott  
Naoki Yoshida

Sponsored by:

Royal Swedish Academy of Sciences, Wenner-Gren Foundations, Nordita

   .  Cosmic Dawn at High Latitudes

Swedish Royal Academy of Sciences
Beijer auditorium