Probing the CMB cold spot through local Minkowski functionals

被引：8

作者：

Zhao, Wen ^{[1
]}

机构：

[1] Univ Sci & Technol China, Dept Astron, Key Lab Res Galaxies & Cosmol, Hefei 230026, Peoples R China

来源：

RESEARCH IN ASTRONOMY AND ASTROPHYSICS | 2014年 / 14卷 / 06期

基金：

中国国家自然科学基金;

关键词：

cosmology; cosmic microwave background; MICROWAVE-ANISOTROPY-PROBE; PRIMORDIAL NON-GAUSSIANITY; BACKGROUND ANOMALIES; WMAP OBSERVATIONS; ORIGIN; LIMITS; CLUSTER; VOIDS; SKY;

D O I：

10.1088/1674-4527/14/6/002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Both the Wilkinson Microwave Anisotropy Probe (WMAP) and Planck missions have reported an extremely cold spot (CS) centered at Galactic coordinate (l = 209 degrees, b = -57 degrees) in the cosmic microwave background map. We study the local non-Gaussianity of the CS by defining local Minkowski functionals. We find that the third Minkowski functional v(2) is quite sensitive to the non-Gaussianity caused by the CS. Compared with random Gaussian simulations, the WMAP CS deviates from Gaussianity at more than a 99% confidence level with a scale of R similar to 10 degrees. Meanwhile, we find that cosmic texture provides an excellent explanation for these anomalies related to the WMAP CS, which could be further tested by future polarization data.

引用

页码：625 / 634

页数：10

共 35 条

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