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To the center of cold spot with Planck

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 4σconfidence level. Such behavior of the K-map supports the void nature of the cold spot. The applied method can be used for tracing voids that have no signatures in redshift surveys.

preprint2014arXivOpen access
V. G. GurzadyanA. L. KashinH. KhachatryanE. PoghosianS. SargsyanG. Yegorian
astro-ph.COgr-qc
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V. G. GurzadyanA. L. KashinH. KhachatryanE. PoghosianS. SargsyanG. Yegorian

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