2012

Probing CMB Cold Spot through Local Minkowski Functionals

Zhao, Wen

Understand

Both WMAP and PLANCK missions reported the extremely Cold Spot (CS) centered at Galactic coordinate ($l=209^{\circ}$, $b=-57^{\circ}$) in CMB map.

In this paper, we study the local non-Gaussianity of CS by defining the local Minkowski functions.
We find that the third Minkowski function $\nu_2$ is quite sensitive to the non-Gaussianity caused by CS.
Compared with the random Gaussian simulations, WMAP CS deviates from Gaussianity at more than 99% confident level at the scale $R\sim10^{\circ}$.

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