MODELING ATMOSPHERIC EMISSION FOR CMB GROUND-BASED OBSERVATIONS
MODELING ATMOSPHERIC EMISSION FOR CMB GROUND-BASED OBSERVATIONS
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DOI：
10.1088/0004-637x/809/1/63
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发表时间：
2015-01
期刊：
影响因子：
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通讯作者：
J. Errard;P. Ade;Y. Akiba;K. Arnold;M. Atlas;C. Baccigalupi;D. Barron;D. Boettger;J. Borrill-J.-Borril
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文献类型：
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作者：
J. Errard;P. Ade;Y. Akiba;K. Arnold;M. Atlas;C. Baccigalupi;D. Barron;D. Boettger;J. Borrill-J.-Borril
大气是地基宇宙微波背景辐射实验的重要噪声源之一。通过增加探测器上的光负载，它放大了它们的有效噪声，而它的波动在探测到的信号之间引入了空间和时间相关性。我们提出了一个物理动机的三维模型的大气总强度发射在毫米和亚毫米波长。我们对探测器时间顺序数据之间的相关性进行了新的分析估计，作为仪器和测量设计的函数，以及风、相对湿度、温度和湍流特征等几个大气参数。使用一个原始的数值计算，我们研究的影响，每个物理参数的相关性在一个给定的实验的时间序列。然后，我们使用参数似然方法来验证建模和估计大气参数的北极熊-i项目第一季的数据集。我们推导出一个新的上限1.0%的线性偏振大气辐射的分数。我们还将我们的结果与以前的研究和气象站测量结果进行了比较。该模型可用于未来的地基CMB观测的现实模拟。
Atmosphere is one of the most important noise sources for ground-based cosmic microwave background (CMB) experiments. By increasing optical loading on the detectors, it amplifies their effective noise, while its fluctuations introduce spatial and temporal correlations between detected signals. We present a physically motivated 3D-model of the atmosphere total intensity emission in the millimeter and sub-millimeter wavelengths. We derive a new analytical estimate for the correlation between detectors time-ordered data as a function of the instrument and survey design, as well as several atmospheric parameters such as wind, relative humidity, temperature and turbulence characteristics. Using an original numerical computation, we examine the effect of each physical parameter on the correlations in the time series of a given experiment. We then use a parametric-likelihood approach to validate the modeling and estimate atmosphere parameters from the polarbear-i project first season data set. We derive a new 1.0% upper limit on the linear polarization fraction of atmospheric emission. We also compare our results to previous studies and weather station measurements. The proposed model can be used for realistic simulations of future ground-based CMB observations.