A cross-correlation of WMAP and ROSAT

被引：4

作者：

Diego, JM

Silk, J

Sliwa, W

机构：

[1] Univ Oxford, Oxford OX1 3RH, England

[2] Nicolas Copernicus Astron Ctr, PL-00716 Warsaw, Poland

来源：

NEW ASTRONOMY REVIEWS | 2003年 / 47卷 / 8-10期

关键词：

galaxy clusters; CMB; X-rays;

D O I：

10.1016/j.newar.2003.07.016

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We cross-correlate the recent CMB WMAP 1 year data with the diffuse soft X-ray background map of ROSAT. We look for common signatures due to galaxy clusters (SZ effect in CMB, bremsstrahlung in X-rays) by cross-correlating the two maps in real and in Fourier space. We do not find any significant correlation and we explore the different reasons for this lack of correlation. The most likely candidates are the possibility that we live in a low sigma(8) universe (sigma(8)<0.9) and/or systematic effects in the data especially in the diffuse X-ray maps which may suffer from significant cluster signal subtraction during the point source removal process. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：855 / 858

页数：4

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