FOUR FUNDAMENTAL FOREGROUND POWER SPECTRUM SHAPES FOR 21 cm COSMOLOGY OBSERVATIONS

被引：240
作者：
Morales, Miguel F. [1 ]
Hazelton, Bryna [1 ]
Sullivan, Ian [1 ]
Beardsley, Adam [1 ]
机构：
[1] Univ Washington, Dept Phys, Seattle, WA 98195 USA
来源：
ASTROPHYSICAL JOURNAL | 2012年 / 752卷 / 02期
基金：
美国国家科学基金会;
关键词：
cosmology: observations; methods: data analysis; techniques: interferometric; CENTIMETER FLUCTUATIONS; HIGH-REDSHIFT; REIONIZATION; EPOCH; SUBTRACTION; FREQUENCIES; TOMOGRAPHY; EMISSION; GAS; ERA;
D O I：
10.1088/0004-637X/752/2/137
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Contamination from instrumental effects interacting with bright astrophysical sources is the primary impediment to measuring Epoch of Reionization (EoR) and Baryon Acoustic Oscillations (BAO) 21 cm power spectra-an effect called mode mixing. In this paper, we identify four fundamental power spectrum shapes produced by mode mixing that will affect all upcoming observations. We are able, for the first time, to explain the wedge-like structure seen in advanced simulations and to forecast the shape of an "EoR window" that is mostly free of contamination. Understanding the origins of these contaminations also enables us to identify calibration and foreground subtraction errors below the imaging limit, providing a powerful new tool for precision observations.
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页数：8
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