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arXiv 0906.4069astro-ph.CO
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用于高精度宇宙微波背景偏振测量的BICEP望远镜的表征

Characterization of the BICEP Telescope for High-Precision Cosmic Microwave Background Polarimetry

Y. D. Takahashi, P. A. R. Ade, D. Barkats, J. O. Battle, E. M. Bierman, J. J. Bock, H. C. Chiang, C. D. Dowell, L. Duband, E. F. Hivon, W. L. Holzapfel, V. V. H… 展开作者

Y. D. Takahashi, P. A. R. Ade, D. Barkats, J. O. Battle, E. M. Bierman, J. J. Bock, H. C. Chiang, C. D. Dowell, L. Duband, E. F. Hivon, W. L. Holzapfel, V. V. Hristov, W. C. Jones, B. G. Keating, J. M. Kovac, C. L. Kuo, A. E. Lange, E. M. Leitch, P. V. Mason, T. Matsumura, H. T. Nguyen, N. Ponthieu, C. Pryke, S. Richter, G. Rocha, K. W. Yoon

摘要:

BICEP实验是专门设计用来在宇宙微波背景(CMB)的偏振中寻找暴胀引力波的特征。BICEP利用一种新型的小口径折射望远镜和49对偏振敏感测辐射热计,从2006年2月开始在南极完成了为期3年的成功观测。为了限制暴胀B模式偏振的振幅,预计它将比3 K CMB强度弱至少7个数量级,精确控制系统效应是必不可少的。本文描述了表征潜在的系统误差的BICEP实验,补充同伴文件的初始宇宙学结果。利用实验分析流水线,模拟了系统误差对B模偏振测量的影响。在这些模拟的指导下,我们已经建立了关键的仪器特性,包括测辐射热计的相对增益,光束失配,偏振方向,望远镜指向,旁瓣,热稳定性和时间流噪声模型的表征基准。基准与测量值的比较表明,我们已经充分表征了仪器,以确保系统误差不会限制BICEP的2年结果,并确定了未来的改进可能是必要的,以探测通货膨胀的B模式极化下降到低于张量-标量比r = 0.1的水平。

英文摘要:

The BICEP experiment was designed specifically to search for the signature of inflationary gravitational waves in the polarization of the cosmic microwave background (CMB). Using a novel small-aperture refractor and 49 pairs of polarization-sensitive bolometers, BICEP has completed 3 years of successful observations at the South Pole beginning in 2006 February. To constrain the amplitude of the inflationary B-mode polarization, which is expected to be at least 7 orders of magnitude fainter than the 3 K CMB intensity, precise control of systematic effects is essential. This paper describes the characterization of potential systematic errors for the BICEP experiment, supplementing a companion paper on the initial cosmological results. Using the analysis pipelines for the experiment, we have simulated the impact of systematic errors on the B-mode polarization measurement. Guided by these simulations, we have established benchmarks for the characterization of critical instrumental properties including bolometer relative gains, beam mismatch, polarization orientation, telescope pointing, sidelobes, thermal stability, and timestream noise model. A comparison of the benchmarks with the measured values shows that we have characterized the instrument adequately to ensure that systematic errors do not limit BICEP's 2-year results, and identifies which future refinements are likely necessary to probe inflationary B-mode polarization down to levels below a tensor-to-scalar ratio r = 0.1.

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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