To the center of cold spot with Planck

Understand

The structure of the cold spot, of a non-Gaussian anomaly in the cosmic microwave background (CMB) sky first detected by Vielva et al.

• is studied using the data by Planck satellite.
• The obtained map of the degree of stochasticity (K-map) of CMB for the cold spot, reveals, most clearly in 100 GHz band, a shell-type structure with a center coinciding with the minima of the temperature distribution.
• The shell structure is non-Gaussian at a 4\sigma confidence level.