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arXiv 1408.5396astro-ph.CO
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Planck温度各向异性映射中的局部方差不对称性

Local variance asymmetries in Planck temperature anisotropy maps

Saroj Adhikari

摘要:

最近的研究表明,温度各向异性的局部方差图是研究大尺度半球功率不对称性的简单而有用的工具。这是通过研究局部方差图的偶极子分布来完成的。在这项工作中,我们扩展了偶极不对称性的研究,局部方差图使用前景清洁普朗克143 GHz和217 GHz的数据到更小的尺度。在这样做时,我们包括CMB多普勒偶极子的影响。此外,我们表明,它是可以使用本地方差地图来测量这些普朗克通道地图的多普勒偶极子,在删除大规模的功能(高达$l=600$)后,在约$3 σ$的意义。在这些小尺度上,我们没有发现任何功率不对称的方向上的异常大尺度功率不对称超出预期的宇宙方差。在大尺度上,我们验证了以前的结果,即半球形功率不对称的存在下,至少$3.3 σ$的意义。

英文摘要:

Recently, it was shown that local variance maps of temperature anisotropy are simple and useful tools for the study of large scale hemispherical power asymmetry. This was done by studying the distribution of dipoles of the local variance maps. In this work, we extend the study of the dipolar asymmetry in local variance maps using foreground cleaned Planck 143 GHz and 217 GHz data to smaller scales. In doing so, we include the effect of the CMB Doppler dipole. Further, we show that it is possible to use local variance maps to measure the Doppler dipole in these Planck channel maps, after removing large scale features (up to $l=600$), at a significance of about $3 σ$. At these small scales, we do not find any power asymmetry in the direction of the anomalous large scale power asymmetry beyond that expected from cosmic variance. At large scales, we verify previous results i.e. the presence of hemispherical power asymmetry at a significance of at least $3.3 σ$.

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