arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2011.10757astro-ph.IMphysics.comp-ph
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天籁实验的数据处理流水线

Data Processing Pipeline For Tianlai Experiment

Shifan Zuo, Jixia Li, Yichao Li, Das Santanu, Albert Stebbins, Kiyoshi W. Masui, Richard Shaw, Jiao Zhang, Fengquan Wu, Xuelei Chen

AI总结:

针对天籁21cm强度映射实验中的弱信号提取、仪器误差和海量干涉仪数据处理难题,论文介绍了集RFI标记、定标、分箱、制图及新算法于一体的公开流水线tlpipe。

摘要:

天籁(Tianlai)项目是一项21cm强度映射实验,旨在通过测量大尺度结构功率谱中的重子声学振荡(BAO)特征来探测暗能量。该实验为检验用于宇宙学21cm信号提取的数据处理方法提供了机会,而这在当前射电天文学研究中仍是一项巨大挑战。21cm信号远弱于前景信号,并且容易受到仪器响应不完善的影响。此外,处理海量干涉仪数据也带来了实际挑战。我们开发了一款名为tlpipe的数据处理流水线软件,用于处理天籁实验的漂移扫描巡天数据。它执行射频干扰(RFI)标记、阵列定标、分箱和制图等离线数据处理任务,还包括数据分析所需的实用函数,如数据选择、变换、可视化等。流水线中实现了许多新算法,例如用于阵列定标的特征向量分解方法,以及用于m模式分析的Tikhonov正则化。本文描述tlpipe的设计与实现,并通过对真实数据的一些分析说明其功能。最后,我们概述了这一公开代码未来的发展方向。

英文摘要:

The Tianlai project is a 21cm intensity mapping experiment aimed at detecting dark energy by measuring the baryon acoustic oscillation (BAO) features in the large scale structure power spectrum. This experiment provides an opportunity to test the data processing methods for cosmological 21cm signal extraction, which is still a great challenge in current radio astronomy research. The 21cm signal is much weaker than the foregrounds and easily affected by the imperfections in the instrumental responses. Furthermore, processing the large volumes of interferometer data poses a practical challenge. We have developed a data processing pipeline software called {\tt tlpipe} to process the drift scan survey data from the Tianlai experiment. It performs offline data processing tasks such as radio frequency interference (RFI) flagging, array calibration, binning, and map-making, etc. It also includes utility functions needed for the data analysis, such as data selection, transformation, visualization and others. A number of new algorithms are implemented, for example the eigenvector decomposition method for array calibration and the Tikhonov regularization for $m$-mode analysis. In this paper we describe the design and implementation of the {\tt tlpipe} and illustrate its functions with some analysis of real data. Finally, we outline directions for future development of this publicly code.

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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