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arXiv 0807.0438astro-ph
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测辐射热干涉仪对CMB功率谱的灵敏度

Sensitivity of a Bolometric Interferometer to the CMB power spectrum

J. -Ch. Hamilton, R. Charlassier, C. Cressiot, J. Kaplan, M. Piat, C. Rosset

摘要:

上下文在宇宙微波背景中寻找B模偏振涨落是现代宇宙学的主要挑战之一。B模式信号的预期电平非常低,因此需要开发具有低系统误差的高灵敏度仪器。一个吸引人的可能性是热干涉测量法。目标。在这篇文章中,我们比较了直接成像,外差和测辐射热干涉术实现的CMB角功率谱的灵敏度。方法.使用一个简单的功率谱估计,我们计算其方差导致对口的直接成像的著名诺克斯公式的测辐射热干涉。结果我们发现,测热干涉法是不敏感的直接成像。然而,正如预期的那样,由于测辐射热计的低噪声,它最终比外差干涉测量法更灵敏。因此,它似乎是具有不同且可能较低的系统误差的直接成像器的替代方案,这主要是由于在喇叭前面没有光学设置。

英文摘要:

Context. The search for B-mode polarization fluctuations in the Cosmic Microwave Background is one of the main challenges of modern cosmology. The expected level of the B-mode signal is very low and therefore requires the development of highly sensitive instruments with low systematic errors. An appealing possibility is bolometric interferometry. Aims. We compare in this article the sensitivity on the CMB angular power spectrum achieved with direct imaging, heterodyne and bolometric interferometry. Methods. Using a simple power spectrum estimator, we calculate its variance leading to the counterpart for bolometric interferometry of the well known Knox formula for direct imaging. Results. We find that bolometric interferometry is less sensitive than direct imaging. However, as expected, it is finally more sensitive than heterodyne interferometry due to the low noise of the bolometers. It therefore appears as an alternative to direct imagers with different and possibly lower systematic errors, mainly due to the absence of an optical setup in front of the horns.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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