论文标题
银河同步体温度和极化图的统计特性 - 多频比较
Statistical properties of Galactic synchrotron temperature and polarization maps -- a multi-frequency comparison
论文作者
论文摘要
从我们的星系中的同步加速器发射的统计特性是从靶向宇宙起源信号的观察的角度以及了解我们银河系中物理过程的观察的角度有价值的。在这项工作中，我们将ARXIV：2104.00419V2的分析扩展到 - （a）在WMAP，Planck和Stockert-Villa提供的不同频率下的所有SKY总前景排放图，（B）组件分隔由WMAP，Planck和Beyrows Plorcy提供的温度分离的Synchrotron MAPS和PLANCK和PLANCK和PLALCAME和（C）和（C）和（C）和（C）和（C）和（C）和（C）和（C）和（C）和（C）和（C）MAPS MAPS。我们使用的工具是Minkowski功能和张量。我们的主要目标是双重的。首先，我们通过观察频率来确定总前景图的形态特性的变化，并与模拟进行比较。这阐明了由于不同频率下不同前景成分的相对优势而导致的形态变化。接下来，我们使用各种组分分离的同步体温度和极化图分析了较小尺度上同步稳定性波动的非高斯和统计各向同性的性质。我们发现，所有地图都表现出与Haslam图一致的峰度非高斯性。对于组件分离管道的小尺度同步加速器波动建模可能是重要的输入。这也表明，CMB中残留的同步污染将表现为峰度。研究不同的组件分离地图时，我们发现超越Planck和WMAP MCMC-E在所有尺度上都与Haslam吻合。其他地图显示出不同统计意义的差异。我们的分析表明，残留AME和/或免费排放和点源的结合是有助于这些差异，并强调了对管道的进一步改进的必要性。
Understanding the statistical properties of synchrotron emission from our Galaxy is valuable from the perspective of observations targeting signals of cosmological origin, as well as for understanding physical processes in our Galaxy. In this work, we extend the analysis of arXiv:2104.00419v2 to -- (a) all-sky observed maps of total foreground emissions at different frequencies provided by WMAP, Planck and Stockert-Villa, (b) component separated synchrotron temperature maps provided by WMAP, Planck and BeyondPlanck, and (c) component separated polarization maps provided by WMAP and Planck. The tools we use are Minkowski functionals and tensors. Our main goals are twofold. First, we determine the variation of morphological properties of the total foreground maps with observing frequency and compare with simulations. This elucidates how the morphology varies due to the relative dominance of different foreground components at different frequencies. Next, we analyze the nature of non-Gaussianity and statistical isotropy of synchrotron fluctuations on smaller scales using various component separated synchrotron temperature and polarization maps. We find that all maps exhibit kurtosis non-Gaussianity, in agreement with the Haslam map. This result can be an important input for the modelling of small-scale synchrotron fluctuations for component separation pipelines. This also suggests that residual synchrotron contamination in CMB will manifest as kurtosis. Studying different component separated maps, we find that BeyondPlanck and WMAP MCMC-e agree well with Haslam at all scales. The other maps show differences of varying statistical significance. Our analysis suggests a combination of residual AME and/or free-free emissions and point sources as contributing to these differences, and underscores the need for further improvement of the pipelines.
