Speaker
Description
RELHICs (REionization-Limited H I Clouds) are a population of gas-rich, starless dark matter halos predicted by the $\Lambda$CDM model. Being in hydrostatic equilibrium with the dark matter and the UV background, their gas distribution provides a unique opportunity to directly probe the structure of dark matter halos on small scales. These systems have recently become accessible to observations thanks to deep radio surveys as FAST. I will present results from high-resolution cosmological simulations from the EAGLE project, focusing on the performance of mass and concentration estimators applied to simulated RELHICs. Using a physically motivated model for the H I and gas profiles, we can infer halo properties directly from observable quantities. We find that mass estimates are unbiased on average, though systematic deviations appear in the most H I-rich systems due to environment pressure effects. This analysis provides guidance for current and future observational efforts with upcoming facilities such as SKA.
| References | Alejandro Benitez-Llambay and Julio F. Navarro 2023 ApJ 956 1- Alejandro Benitez-Llambay , Carlos Frenk, Volume 498, Issue 4, November 2020, Pages 4887–4900, https://doi.org/10.1093/mnras/staa2698 |
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