The non-Gaussian cold spot in WMAP

Details The non-Gaussian cold spot in WMAP The non-Gaussian cold spot in WMAP

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006newar..50..875m&link_type=abstract

New Astronomy Reviews, Volume 50, Issue 11-12, p. 875-879.

Astronomy and Astrophysics

Astronomy

8

Scientific paper

We review the properties of the non-Gaussian cold spot found in the WMAP data. The spot, which was first found in the WMAP 1-year data at position (b = -57°, l = 209°) and subtending ≈10° in the sky, has been now confirmed with the WMAP 3-year data. It is clearly detected with several different statistical methods acting on wavelet coefficients. The probability of finding such a spot in Gaussian simulations is around 1%. The frequency dependence of the spot is flat at a very high precision, rejecting the possibility of being due to the Sunyaev Zeldovich effect or Galactic foregrounds. Finally, we discuss different possibilities which can help to explain its origin.

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