The project has now been completed. Given my leadership in the field of early galaxy formation, I was invited to write a review for the prestigious Physics Reports [1].
Science Objective A:
WPA1: We have recently submitted a paper on inferring the escape fractions [2]. We have published a proof-of-concept paper to highlight the observability of different escape-fraction scenarios with the Square Kilometre Array [3] and JWST [4].
WPA2: We have run this ASTRAEUS framework for a variety of reionization feedback scenarios to study the galaxy-reionization interplay [5], the key reionization sources [6], the star formation histories of early galaxies [7] and black hole physics [8,9,10]. We have also studied the observability of the 21cm bispectrum with the SKA [11] and 21cm-galaxy correlations for the Astro2020 Decadal survey [12].
WPA3: We have now identified Lyman Alpha Emitters in the Astraeus framework [13]. Our model has also been used to make predictions for the brightness temperature of the IGM using the Millimetre Wave Array [14]. The Astraeus framework has also been used to quantify the cosmic variance expected for forthcoming observations [15]. Finally, going beyond the original plan, our models have also been used to study the impact of Black Hole feedback on the luminosity and stellar mass assembly of high-redshift galaxies [16].
Science objective B:
WPB1: We have fully coupled our semi-analytic galaxy formation model (DELPHI) with a model to track the emergence of dust and metals in early galaxies over an unprecedented mass range [17]. This is being used to interpret the key results from cutting-edge ALMA large programs, including those from REBELS [18].
WPB2: We have included the latest metal yields into the Astraeus framework to track the emergence and evolution of metallicity scaling relations in the first billion years [19].
WPB3: We have used dust in two different models (Astraeus and Delphi) to show their effects on both the star forming and black hole population [10] as well as forming the basis for observing dusty early galaxies [18].
Science objective C:
WPC1-2: During the ERC, we have significantly extended our framework for galaxy formation in multiple DM cosmologies [20] to study their impact on reionziation and its observability [21]
WPC3: In 2017 and 2018, new observations offered an excellent opportunity to use the DELPHI semi-analytic model to put constraints on the warm dark matter particle mass and definitely rule out <3keV warm dark matter [22, 23, 24].
The results of this work have been published in 42 peer-reviewed papers and 8 white papers. We have also been a part of 6 observational campaigns (for both HST and JWST) as a result of out theoretical expertise. Finally, the results have been disseminated in 43 talks in international meetings (a further 6 were postponed/cancelled due to Covid-19), 38 colloquia/seminars in various international departments and through the group members organising 10 conferences (6 as SOC; 4 as Chair). We have also delivered a total of 6 outreach lectures.
Key publications:
[1] Dayal et al., 2018, Physics Reports, Volume 780, p. 1-64
[2] Bremer et al., 2022, submitted to MNRAS.
[3] Seiler et al., 2019, MNRAS, 487, 5739
[4] Choudhury & Dayal, MNRAS, 2019, 482, 19
[5] Hutter et al., 2021, MNRAS, 503, 3698
[6] Hutter et al., 2021, MNRAS, 506, 215
[7] Legrand et al., 2021, MNRAS, 509, 595
[8] Dayal et al., 2019, MNRAS, 486, 2336
[9] Piana et al., 2021, MNRAS, 500, 2146
[10] Trebitsch et al., 2022, arXiv: 2202.02337
[11] Hutter et al., 2020, MNRAS, 492, 653
[12] Hutter et al., 2019, BAAS, Vol. 51, Issue 57, id. 360
[13] Hutter et al., 2022, submitted to MNRAS
[14] Trott et al., 2021, MNRAS, 507, 772
[15] Ucci et al., 2021, MNRAS, 506, 202
[16] Piana et al., 2022, MNRAS, 510, 5661
[17] Dayal et al., 2022, MNRAS, 512, 989
[18] Bouwens et al, 2022, ApJ, 931, 160
[19] Ucci et al., 2021, submitted to MNRAS, arXiv:2112.02115
[20] Dayal et al., 2015, ApJ, 806, 67D
[21] Dayal et al., 2017, ApJ, 836, 16
[22] Bremer et al., 2018, MNRAS, 477, 2154
[23] Dayal et al., 2017, MNRAS, 472, 4414
[24] Chatterjee et al, 2019, MNRAS, 487, 3560
