蟹状星云作为宽波束宇宙微波背景偏振巡天的定标器
The Crab Nebula as a Calibrator for wide-beam Cosmic Microwave Background polarization surveys
摘要：
我们分析了偏振漫发射在宽光束毫米波偏振仪校准中的作用，当使用蟹状星云作为偏振亮度和偏振角的参考源时。我们表明，CMB偏振实验的目的是检测B-模式的情况下，张量标量比$r \sim 0.001$，宽（直径几度），精确（$σ_Q$，$σ_U$ $\sim$ 20 $μ$ $K_{CMB}$ arcmin），高角分辨率（$< \mathrm{FWHM}$）的参考地图需要适当地考虑到扩散偏振发射的影响，并避免显着的偏差校准。
英文摘要：
We analyze the effect of polarized diffuse emission in the calibration of wide-beam mm-wave polarimeters, when using the Crab Nebula as a reference source for both polarized brightness and polarization angle. We show that, for CMB polarization experiments aiming at detecting B-mode in a scenario with a tensor to scalar ratio $r \sim 0.001$, wide (a few degrees in diameter), precise ($σ_Q$ , $σ_U$ $\sim$ 20 $μ$$K_{CMB}$ arcmin), high angular resolution ($< \mathrm{FWHM}$) reference maps are needed to properly take into account the effects of diffuse polarized emission and avoid significant bias in the calibration.
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