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The NSF AI Institute for Artificial Intelligence and Fundamental Interaction
08 Oct 2025
cosmology-and-nongalactic-astrophysicsastrophysics-of-galaxiesphysics

Stacking 21-cm Maps around Lyman-αα Emitters during Reionization: Prospects for a Cross-correlation Detection with the Hydrogen Epoch of Reionization Array

The University of Texas at DallasMIT logoMITMIT Kavli Institute for Astrophysics and Space ResearchThe NSF AI Institute for Artificial Intelligence and Fundamental Interaction
This study forecasts the feasibility of detecting a cross-correlation signal between 21-cm maps from the Hydrogen Epoch of Reionization Array (HERA) and spectroscopically confirmed Lyman-α Emitters (LAEs) during the Epoch of Reionization. Researchers leveraged advanced radiation-hydrodynamic simulations (Thesan) and realistic HERA instrumental models to demonstrate that a 3σ detection is possible with HERA's current configuration, requiring as few as 43 LAEs at high global neutral fractions or around 1000 LAEs in a fiducial reionization scenario, provided spectroscopic redshifts are available.
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