Journal article
Inferring the astrophysics of reionization and cosmic dawn from galaxy luminosity functions and the 21-cm signal
J Park, A Mesinger, B Greig, N Gillet
Monthly Notices of the Royal Astronomical Society | OXFORD UNIV PRESS | Published : 2019
DOI: 10.1093/mnras/stz032
Abstract
The properties of the first galaxies, expected to drive the Cosmic Dawn and the Epoch of Reionization, are encoded in the 3D structure of the cosmic 21-cm signal. Parameter inference from upcoming 21-cm observations promises to revolutionize our understanding of these unseen galaxies. However, prior inference was done using models with several simplifying assumptions. Here we introduce a flexible, physically motivated parametrization for highz galaxy properties, implementing it in the public code 21CMFAST. In particular, we allow their star formation rates and ionizing escape fraction to scale with the masses of their host dark matter haloes, and directly compute inhomogeneous, sub-grid reco..
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Grants
Awarded by European Research Council
Funding Acknowledgements
We thank R. Bouwens, S. Finkelstein, and R. Livermore for their UV LF data, and associated insightful discussions. This work was supported by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement no. 638809 - AIDA - PI: Mesinger). The results presented here reflect the authors' views; the ERC is not responsible for their use. Parts of this research were supported by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013. We acknowledge support from INAF under PRIN SKA/CTA FORECaST. The simulations shown in Appendix A were performed as part of the PRACE tier-0 grant GAFFER (project no. 2016163945). We acknowledge PRACE for awarding us access to Curie at GENCI@CEA,France.