Estimating the impact of foregrounds on the future detection of Rayleigh scattering

Estimating the impact of foregrounds on the future detection of Rayleigh scattering
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估计前景对未来瑞利散射检测的影响

DOI:
10.1088/1475-7516/2022/09/048
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发表时间:
2022
影响因子:
6.4
通讯作者:
Meyers, Joel
Meyers, Joel
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhu, Yijie;Beringue, Benjamin;Choi, Steve K.;Battaglia, Nicholas;Meerburg, P. Daniel;Meyers, Joel

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在复合后不久,中性氢对宇宙微波背景辐射(CMB)的瑞利散射留下了强度和偏振波动的频率依赖性印记。对CMB瑞利散射的高信噪比观测将为复合物理学提供更多的见解,包括对原始氦分数,光遗迹密度和中微子质量总和等参数的更大约束力。然而,这样的测量CMB瑞利散射是具有挑战性的,由于天体物理前景的存在,这是更强烈的高频率,瑞利散射的影响是最突出的。在这里,我们预测中巴瑞利散射的可探测性,包括前景去除使用盲内部线性组合方法为一组不久的将来的调查。我们表明,大气对地面观测站和天体物理前景的影响构成了一个显着的障碍,探测CMB瑞利散射与实验计划在这十年,虽然一个高意义的测量应该是可能的未来CMB卫星。
Rayleigh scattering of the cosmic microwave background (CMB) by neutral hydrogen shortly after recombination leaves frequency-dependent imprints on intensity and polarization fluctuations. High signal-to-noise observations of CMB Rayleigh scattering would provide additional insight into the physics of recombination, including greater constraining power for parameters like the primordial helium fraction, the light relic density, and the sum of neutrino masses. However, such a measurement of CMB Rayleigh scattering is challenging due to the presence of astrophysical foregrounds, which are more intense at the high frequencies, where the effects of Rayleigh scattering are most prominent. Here we forecast the detectability of CMB Rayleigh scattering including foreground removal using blind internal linear combination methods for a set of near-future surveys. We show that atmospheric effects for ground-based observatories and astrophysical foregrounds pose a significant hindrance to detecting CMB Rayleigh scattering with experiments planned for this decade, though a high-significance measurement should be possible with a future CMB satellite.
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