Polarized synchrotron emission
Polarized synchrotron emission
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偏振同步加速器发射
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
G. Zotti
中科院分区：
文献类型：
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作者：
C. Burigana;L. Porta;W. Reich;P. Reich;J. González;M. Massardi;G. Zotti
~ 70 GHz。准确理解其极化特性对于提取宇宙微波背景偏振各向异性所包含的宇宙学信息至关重要。ν ~ 1 GHz的射电巡天为研究银河系同步辐射提供了独特的机会，在那里它代表了主要成分，可能除了靠近银面的区域，在那里自由-自由发射也很重要。我们回顾了星系射电巡天在θ > ~ 0.5◦尺度上的观测状况。莱顿巡天的频率覆盖范围从0.408 GHz到1.411 GHz，对于理解去极化现象仍然具有重要意义。最近的1.42 GHz（总强度和极化）的调查具有更好的灵敏度和天空采样，现在覆盖了两个天体半球，并允许准确地绘制漫射同步辐射的相关特性。我们从角功率谱的角度对这些调查进行了分析。将这些结果的简单频率外推与最近的WMAP结果进行比较，表明我们接近于绘制漫射同步加速器极化波动的大部分，并了解对CMB实验的相应含义。CMB和早期宇宙物理学
∼ 70 GHz. The accurate understanding of its polarization properties is crucial to extract the cosmological information contained in the CMB polarization anisotropy. Radio surveys at ν ∼ 1 GHz offer the unique opportunity to study Galactic synchrotron emission where it represents the dominant component, possibly except for regions close to the Galactic plane where free-free emission is also important. We review the observational status of Galactic radio surveys at scales θ > ∼ 0.5 ◦ . Leiden surveys, thanks to their frequency coverage from 0.408 GHz to 1.411 GHz, still remain of fundamental importance for the comprehension of depolarization phenomena. Recent surveys at 1.42 GHz (in both total intensity and polarization) with a better sensitivity and sky sampling now cover both celestial hemispheres and allow to accurately map the correlation properties of the diffuse synchrotron emis sion. We present an analysis of these surveys in terms of angular power spectrum. A comparison of a simple frequency extrapolation of these results with the recent WMAP results shows that we are close to map the bulk of the diffuse synchrotron polarization fluctuations and to understa nd the corresponding implications for CMB experiments. CMB and Physics of the Early Universe