Galactic Magnetic Turbulence from Radio data

Understand

Fluctuations in the Galactic synchrotron emission can be traced by the angular power spectrum of radio maps at low multipoles.

• At frequencies below few GHz, large-scale anisotropies are mainly induced by magnetic field turbulence.
• By performing an analysis of five radio maps, we extract constraints on turbulence spectral index and halo scale.
• Results favour a power spectrum significantly flatter than for 3D Kolmogorov-like turbulence, and a thin halo.