Cosmic Dawn at High Latitudes

10 Jun 2024, 09:00 → 5 Jul 2024, 18:00 Europe/Stockholm

Albano 3: 6335 - Hekto (10 seats) (Albano Building 3)

Anne Hutter, Charlotte Mason (Cosmic Dawn Center), Garrelt Mellema (Stockholm University), Matthew Hayes (Stockholm University), Sambit Kumar Giri (Nordita), Sune Toft (Cosmic Dawn Center)

Venue

Nordita, Stockholm, Sweden

---

Background

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 program is designed according to 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.

These themes form the focus of the different weeks of the program loosely following the schedule:

Week 1 (10 - 14 June) - Theme 2 & 3

Week 2 (17 - 21 June) - Theme 1 & 2 

Week 3 (24 - 28 June) - Conference at the Royal Academy of Sciences (all themes)

Week 4 (1 - 5 July) - Theme 3 & 4

During the program (weeks 1, 2 and 4) only two talks per day are scheduled leaving plenty of time for collaboration and discussion. The conference (week 3) will consist of five days of talks. The conference venue allows for 100 participants, the program venue for 20 - 30 participants.

The final list of participants during the workshop weeks can be found here.

---

Relation between Conference and Program

The conference is embedded in the program which means that the registration is shared. However, the conference has its own website with information about abstract submission, the venue, etc.

---

Important dates

Conference abstract submission deadline - March 11th  (submit through the conference web page)            
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 

---

Accommodation

Nordita can provide a limited number of rooms in the Stockholm apartment hotel, BizApartments, free of charge for invited speakers and for some selected participants, after application evaluation (see Financial support section below). These hotel apartments are designed for long-stay accommodation with fully-equipped kitchens and standard amenities. For more details, see here. Subject to availability, it is also possible to arrange a larger apartment (for families) upon request. 

Please specify the type of accommodation you would like in the application form, including if you will make your own arrangements. Any special requests should be made using the comments section of the application form. 

---

Financial support

Nordita can cover travel and accommodation expenses for invited speakers and, partly or fully, for a limited number of further participants. If you would like to apply for financial support, please contact one of the event organizers, briefly motivating your request. We encourage participants to use their own travel grants if possible, to facilitate support for participants with reduced financial possibilities. 

---

Application/Registration

The joint application form for all program weeks, including the embedded conference, is found in the menu on the left under "Application" or at this link. 

If you would like to participate, please register/apply by April 14th (anywhere on Earth). In particular if you require accommodation, travel or visa support, it is critical that you apply by this deadline. 

After this deadline review of applications will begin and results communicated within three weeks. Later applications are considered on a rolling basis, subject to remaining capacity. 

 

CAUTION! Occasionally scammers contact participants claiming to assist you with accommodation and travel arrangements etc.

Please be vigilant and do not share information with them! Also, please notify the organizers if you are in any doubt about the legitimacy of an approach, and never hesitate to contact us with any further questions.   
 

---

Sponsored by:

Monday 10 June

09:00 → 09:30 Registration & Coffee/Tea

09:30 → 10:00 Welcome

Speakers: Garrelt Mellema (Stockholm University), Sambit Kumar Giri (Stockholm University, Nordita)

10:00 → 10:30 When did Cosmic Dawn and Reionisation happen?

Speaker: Sarah Bosman (Heidelberg University)

10:30 → 11:00 Discussion

Speakers: Matthew Hayes (Stockholm Observatory), Sarah Bosman (Heidelberg University)

11:00 → 11:30 Radiative Transfer of Lyman-alpha Photons at Cosmic Dawn

Speaker: Girish Kulkarni (TIFR)

11:30 → 12:00 Discussion

Speakers: Girish Kulkarni (TIFR), Olof Petter Nils Axel Nebrin (Stockholm University)

15:00 → 15:30 Fika: coffee/tea, cake & cookies

Tuesday 11 June

09:00 → 09:30 Coffee/Tea

09:30 → 10:00 Meet with Nordita Director

10:00 → 10:30 Everything you have always wanted to know about 21cm but were afraid to ask

Speaker: Adélie Gorce (IAS, Université Paris-Saclay, CNRS)

10:30 → 11:00 Discussion

Speakers: Adélie Gorce (IAS, Université Paris-Saclay, CNRS), Timothée Schaeffer (University of Zuerich)

11:00 → 11:30 Unveiling the ionising properties of galaxies at the Epoch of Reionisation with NIRCam

Speaker: Charlotte Simmonds (University of Cambridge)

11:30 → 12:00 Discussion

Speakers: Charlotte Simmonds (University of Cambridge), T. Emil Rivera-Thorsen (Stockholm University)

15:00 → 15:30 Fika: coffee/tea, cake & cookies

Wednesday 12 June

09:00 → 10:00 Coffee/Tea

10:00 → 10:30 Impacts of non-stellar sources on IGM: Interpretation of Lyman-α forest observations

Speaker: Arghyadeep Basu (Max Planck Institute for Astrophysics, Garching)

10:30 → 11:00 Discussion

Speakers: Arghyadeep Basu (Max Planck Institute for Astrophysics, Garching), Ivelin Georgiev (Stockholm University)

11:00 → 11:30 Unravelling the properties of the first supermassive black holes using JWST and PTAs

Speaker: Hamsa Padmanabhan (University of Geneva)

11:30 → 12:00 Discussion

Speakers: Hamsa Padmanabhan (University of Geneva), Maxime Trebitsch (Kapteyn Astronomical Institute)

15:00 → 15:30 Fika: coffee/tea

Thursday 13 June

09:00 → 10:00 Coffee/Tea

10:00 → 10:30 Efficient Modelling of Lyman-alpha Opacity fluctuations around EoR

Speaker: Barun Maity (Max Planck Institute for Astronomy)

10:30 → 11:00 Discussion

Speakers: Barun Maity (Max Planck Institute for Astronomy), Laura Keating (University of Edinburgh)

11:00 → 11:30 Analysis of the redshifted 21 cm data with an IGM-based framework

Speaker: Saleem Zaroubi (U. of Groningen)

11:30 → 12:00 Discussion

Speakers: Caroline Heneka, Saleem Zaroubi (Kapteyn Astronomical Institute)

15:00 → 15:30 Fika: coffee/tea, cake & cookies

Friday 14 June

09:00 → 10:00 Coffee/Tea

10:00 → 10:30 Probing reionization with FRBs

Speaker: Abinash Kumar Shaw (University of Nevada, Las Vegas)

10:30 → 11:00 Discussion

Speakers: Abinash Kumar Shaw (University of Nevada, Las Vegas), Hamsa Padmanabhan (University of Geneva)

11:00 → 11:30 Wavelets to Study the EoR

Speaker: Ian Hothi (LPENS/LERMA)

11:30 → 12:00 Discussion

Speakers: Anne Hutter (Cosmic Dawn Center, Niels Bohr Institute, University of Copenhagen), Ian Hothi (LPENS/LERMA)

15:00 → 15:30 Fika: coffee/tea, cake & cookies

Monday 17 June

10:00 → 10:30 A bright future for multi-line intensity mapping and cross-correlations

Speaker: Caroline Heneka

10:30 → 11:00 TBD

Speaker: Samuel Gagnon-Hartman

11:00 → 11:30 Probing reionization with microwave observatories from the Atacama Desert

Speaker: Steve Choi

11:30 → 12:00 Discussion on line intensity mapping

Speakers: Hamsa Padmanabhan, Suman Majumdar

13:15 → 15:00 Discussion on line intensity mapping

15:00 → 15:30 Fika

Tuesday 18 June

10:00 → 11:00 Introduction to BEoRN

Speaker: Timothee Schaefer

11:00 → 12:00 Motivation & Discussion on JWST - 21cm synergies

Speakers: Koki Kakiichi, Sambit Giri

15:00 → 17:00 Astronomy Summer Picnic

Wednesday 19 June

10:00 → 10:30 The sources and sinks of reionization: a view from radiative transfer simulations

Speaker: Anson d’Aloisio

10:35 → 11:05 Sinks of reionisation: how is the mean free path really measured and what does it mean?

Speaker: Sarah Bosman

11:10 → 12:00 Discussion

Speakers: Anson d’Aloisio, Sarah Bosman

13:30 → 14:00 TBD

Speaker: Charlotte Mason

14:05 → 14:35 TBD

Speaker: Timo Kist

14:40 → 15:30 Discussion

Speakers: Charlotte Mason, Timo Kist

15:30 → 16:00 Fika

Thursday 20 June

10:00 → 10:30 TBD

Speaker: Laura Pentericci

10:35 → 11:05 TBD

Speaker: Maxime Trebitsch

11:10 → 12:00 Discussion

Speakers: Laura Pentericci, Maxime Trebitsch

13:30 → 15:00 Discussion