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arXiv 0907.4011astro-ph.CO
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宇宙微波背景温度图的纬向模

Zonal Modes of Cosmic Microwave Background Temperature Maps

Jo Short, Peter Coles

摘要:

宇宙微波背景温度起伏的全天图通常用球谐分解来表示,球谐分解涉及的模用它们的阶数l和阶数m(其中-l < m < +l)来标记。纬向模(即m = 0的模)特别令人感兴趣,因为它们只随银河纬度变化;因此,它们中的任何异常行为都可能是错误的前景减法的指示。我们进行了一个简单的统计分析的模式与低l来自通过不同的清洁程序从威尔金森微波各向异性探测器(WMAP)的天空图,并表明纬向模式提供了一个有用的诊断可能的系统。

英文摘要:

All-sky maps of the cosmic microwave background temperature fluctuations are usually represented by a spherical harmonic decomposition involving modes labelled by their degree l and order m (where -l < m < +l). The zonal modes (i.e those with m = 0) are of particular interest because they vary only with galactic latitude; any anomalous behaviour in them might therefore be an indication of erroneous foreground substraction. We perform a simple statistical analysis of the modes with low l for sky maps derived via different cleaning procedures from the Wilkinson Microwave Anisotropy Probe (WMAP) and show that the zonal modes provide a useful diagnostic of possible systematics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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