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首页> 外文期刊>International journal of modern physics, D. Gravitation, astrophysics, cosmology >Foreground contribution to the inferred cosmological parameters from Planck
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Foreground contribution to the inferred cosmological parameters from Planck

机译：从普朗克到推断的宇宙学参数的前景贡献

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Previous analyses of cosmic microwave background (CMB) measurements [T. Wibig and A. W. Wolfendale, Mon. Not. R. Astron. Soc. 360 (2005) 236, arXiv: astro-ph/0409397; Mon. Not. R. Astron. Soc. 448 (2015) 1030, arXiv: 1507.0677.] have revealed contamination by areas of high cosmic ray activity in the Milky Way. Here, we update studies, looking at the most recent Planck release of residual maps. We search for possible effects of foreground contamination in the reconstruction of the Lambda CDM cosmological parameters. We focus on the Hubble parameter H-0 and the optical depth to reionization tau, both of which exhibit discrepancies between CMB-inferred values and low-redshift measurements ("the delta H-0 problem"). Using the publicly available "component separated" Planck temperature maps, we single out three distinct regions: the "loops", "chimneys" and "low CR" regions, which disproportionately contributed to CR contamination of WMAP data. We find that two of the four maps are strongly affected by removal of anomalously high or low CR activity regions. However, the Commander method, used to produce the angular power spectrum at low ( 30) multipoles in cosmological analyses, appears robust under these changes. Finally, we use the inferred Hubble parameter H-0 as a proxy to look for general directional dependence of the CMB power spectrum, finding a small but robust dependence on the Galactic longitude. Although there is some evidence for a continuing CR contamination, it is insufficient to provide an answer to the delta H-0 problem, or to the optical depth problem, though dependence of the derived H-0 on direction seems significant. The geometrical pattern - striations along constant longitudes - suggests CR contamination as distinct from a truly cosmological effect.
机译：宇宙微波背景（CMB）测量的先前分析[T. Wibig和A. W. Wolfendale，Mon.不是。 R. Astron。 SOC。 360（2005）236，Arxiv：Astro-PH / 0409397;周一不是。 R. Astron。 SOC。 448（2015）1030，ARXIV：1507.0677。]透露了银河系中高宇宙射线活动领域的污染。在这里，我们更新研究，查看最近的普朗克释放剩余地图。我们在重建Lambda CDM宇宙学参数中寻找前景污染的可能影响。我们专注于Hubble参数H-0和光学深度到标准TAU，两者都表现出CMB推断值和低红移测量之间的差异（“ΔH-0问题”）。使用公开的“组件分离的”普朗克温度图，我们占用了三个不同的区域：“循环”，“烟囱”和“低CR”区域，这对CR污染WMAP数据的CR污染有贡献。我们发现，通过去除异常高或低CR活动区域，这两个地图中的两个都受到强烈影响。然而，用于在宇宙学分析中产生低（＆ 30）多能在低（＆ 30）的多能的角度功率谱的指挥官方法在这些变化下显得坚固。最后，我们使用推断的Hubble参数H-0作为代理来寻找CMB功率谱的一般方向依赖性，找到了对银河系经度的小但稳健的依赖。虽然存在持续的CR污染有一些证据，但它不足以向ΔH-0问题提供答案，或者对光学深度问题提供答案，但是衍生的H-0对方向的依赖性似乎显着。沿着恒定长度的几何模式 - 表明Cr污染与真正宇宙学效应不同。

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