Adding Context to JWST Surveys with Current and Future 21cm Radio Observations

Abstract

Infrared and radio observations of the Epoch of Reionization promise to revolutionize our understanding of the cosmic dawn, and major efforts with the JWST, MWA and HERA are underway. While measurements of the ionizing sources with infrared telescopes and the effect of these sources on the intergalactic medium with radio telescopes \emph{should} be complementary, to date the wildly disparate angular resolutions and survey speeds have made connecting proposed observations difficult. In this paper we develop a method to bridge the gap between radio and infrared studies. While the radio images may not have the sensitivity and resolution to identify individual bubbles with high fidelity, by leveraging knowledge of the measured power spectrum we are able to separate regions that are likely ionized from largely neutral, providing context for the JWST observations of galaxy counts and properties in each. By providing the ionization context for infrared galaxy observations, this method can significantly enhance the science returns of JWST and other infrared observations.

arXiv comment8 pages, 8 figures, accepted to ApJ; updated with accepted version. Text clarifications and updated references

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• Hydrogen Epoch of Reionization Array (HERA) Phase II Deployment and Commissioning
• Contamination of the Epoch of Reionization power spectrum in the presence of foregrounds
• The Concerted Impact of Galaxies and QSOs on the Ionization and Thermal State of the Intergalactic Medium
• The importance of galaxy formation histories in models of reionization
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• Future Constraints on the Reionization History and the Ionizing Sources from Gamma-ray Burst Afterglows
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• An Alcock-Paczynski Test on Reionization Bubbles for Cosmology