Simulating the Detection of the Global 21 cm Signal with MIST for Different Models of the Soil and Beam Directivity

• DOI: 10.3847/1538-4357/ad0f1b
• Publication Date: 2024-01-15T12:27:15Z
• Authors: Raul A. Monsalve; Christian H. Bye; Jonathan L. Sievers; Vadym Bidula; Ricardo Bustos; H. Cynthia Chiang; Xinze Guo; Ian Hendricksen; Francis McGee; F. Patricio Mena; Garima Prabhakar; Oscar Restrepo; Nithyanandan Thya...
• Keywords: Chromaticity; Directivity; SIGNAL (programming language)

Abstract The Mapper of the IGM Spin Temperature (MIST) is a new ground-based, single-antenna, radio experiment attempting to detect global 21 cm signal from Dark Ages and Cosmic Dawn. A significant challenge in this measurement frequency dependence, or chromaticity, antenna beam directivity. MIST observes with above soil without metal ground plane, directivity sensitive electrical characteristics soil. In paper, we use simulated observations study how detection Dawn affected by We simulate using electromagnetic models computed for single- two-layer test recovery chromaticity correction applied data. find that our single-layer enable straightforward even correction. Two-layer increase make more challenging. However, model which bottom layer has lower conductivity than top layer, can be recovered For other models, necessary signal, accuracy requirements parameters vary between models. These results will used as guideline select observation sites are favorable signal.