Fast Radio Bursts as Probes of the Cosmic Web: Scattering Analysis

This study explores the use of Fast Radio Bursts (FRBs) to probe the cosmic web by analyzing scattering signatures in their observed flux. The research focuses on the formation of multiphase gas in the post-accretion-shock regions of cosmic sheets, filaments, and the circumgalactic medium (CGM) of haloes, collectively known as cosmic web objects (CWOs). The study finds that high-z filaments and sheets have a negligible contribution to the total observed scattering. However, the model predicts that if turbulent cloudlets exist in the CGM of intervening massive haloes with a volume-filling fraction of fv≳10−3, they are expected to cause considerable cumulative scattering along an average sightline, resulting in a significant correlation between the total scattering time and source redshifts. The lack of such a correlation in current observations may imply that the cool gas in the CGM has substantial non-thermal pressure, reducing its density, or significant damping of small-scale density fluctuations. Forthcoming localized FRB samples can map these constraints into bounds on volume-filling fractions, densities, cloud sizes, and the strength of turbulence. The implications of this research are significant for understanding the distribution of matter in the universe and the properties of the CGM. By using FRBs as probes, scientists can gain new insights into the structure and evolution of the cosmic web, complementing traditional methods such as galaxy surveys and simulations.

_Context: This intelligence report was compiled by the DailyOrbitalWire Strategy Engine. Verified for Art. 50 Compliance._