Faraday Rotation Measure due to the Intergalactic Magnetic Field

Understand

Studying the nature and origin of the intergalactic magnetic field (IGMF) is an outstanding problem of cosmology.

• Measuring Faraday rotation would be a promising method to explore the IGMF in the large-scale structure (LSS) of the universe.
• We investigated the Faraday rotation measure (RM) due to the IGMF in filaments of galaxies using simulations for cosmological structure formation.
• We employed a model IGMF based on turbulence dynamo in the LSS of the universe; it has an average strength of $< B > \sim 10$ nG and a coherence length of several $\times\ 100\ h^{-1}$ kpc in filaments.