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Understanding the WMAP Cold Spot mystery by Naselsky, Pavel D.; Christensen, Per Rex; Coles, Peter; Verkhodanov, Oleg; Novikov, Dmitry; Kim, Jaiseung is a scholarly article available to read on EtoBox.

What is Understanding the WMAP Cold Spot mystery about?

The first and third year data releases from the WMAP provide evidence of an anomalous Cold Spot (CS) at galactic latitude b=-57deg and longitude l=209deg. We have examined the properties of the CS in some detail in order to assess its cosmological significance. We have performed a cluster analysis of the local extrema in the CMB signal to show that the CS is actually associated with a large group of extrema rather than just one. In the light of this we have re-examined the properties of the WMAP ILC and co-added "cleaned" WCM maps, which have previously been used for the analysis of the properties of the signal in the vicinity of the CS. These two maps have remarkably similar properties on equal latitude rings for |b|>30deg, as well as in the vicinity of the CS. We have also checked the idea that the CMB signal has a non-Gaussian tail, localized in the low multipole components of the signal. For each ring we apply a linear filter with characteristic scale R, dividing the CMB signal in two parts: the filtered part, with characteristic scale above that of the filter R, and the difference between the initial and filtered signal. Using the filter scale as a variable, we can maximize th

Author

Naselsky, Pavel D.; Christensen, Per Rex; Coles, Peter; Verkhodanov, Oleg; Novikov, Dmitry; Kim, Jaiseung

Published

2007

Language

EN