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arXiv 0705.3980astro-ph
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宇宙微波背景中引力透镜的探测

Detection of Gravitational Lensing in the Cosmic Microwave Background

Kendrick M. Smith, Oliver Zahn, Olivier Dore

摘要:

宇宙微波背景(CMB)的引力透镜是标准宇宙学模型的长期预测,最终有望成为宇宙学信息的重要来源,但迄今为止尚未实现首次探测。我们报告了3.4西格玛检测,通过应用二次估计技术从威尔金森微波各向异性探测器(WMAP)卫星的所有天空图,并将结果与NRAO VLA巡天(NVSS)的射电星系计数相关。我们提出了我们的方法,包括潜在污染物的详细讨论。我们的误差估计包括NVSS中密度梯度的系统不确定性,WMAP中的光束效应,银河微波前景,解决和未解决的CMB点源,和热Sunyaev Zeldovich效应。

英文摘要:

Gravitational lensing of the cosmic microwave background (CMB), a long-standing prediction of the standard cosmolgical model, is ultimately expected to be an important source of cosmological information, but first detection has not been achieved to date. We report a 3.4 sigma detection, by applying quadratic estimator techniques to all sky maps from the Wilkinson Microwave Anisotropy Probe (WMAP) satellite, and correlating the result with radio galaxy counts from the NRAO VLA Sky Survey (NVSS). We present our methodology including a detailed discussion of potential contaminants. Our error estimates include systematic uncertainties from density gradients in NVSS, beam effects in WMAP, Galactic microwave foregrounds, resolved and unresolved CMB point sources, and the thermal Sunyaev-Zeldovich effect.

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