The non-Gaussian cold spot in WMAP |
| |
| Authors: | Enrique Martí nez-Gonz lez, Marcos Cruz, Laura Cay n,Patricio Vielva |
| |
| Affiliation: | aIFCA, CSIC-Univ. de Cantabria, Av. los Castros, s/n, E-39005 Santander, Spain;bDepartamento de Física Moderna, Univ. de Cantabria, Av. los Castros, s/n, E-39005 Santander, Spain;cDepartment of Physics, Purdue University, 525 Northwestern Avenue, West Lafayette, IN 47907-2036, USA;dAstrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UK |
| |
| Abstract: | 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. |
| |
| Keywords: | Cosmology Data analysis Cosmic microwave background |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
