期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 435, 期 1, 页码 460-474出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt1341
关键词
instrumentation: interferometers; methods: numerical; dark ages, reionization, first stars
资金
- Swedish Research Council [2012-4144, 2009-4088]
- Science and Technology Facilities Council [ST/I000976/1]
- Southeast Physics Network (SEPNet)
- NSF [AST-1009799]
- NASA [NNX07AH09G, NNX11AE09G]
- TeraGrid grant [TG-AST0900005]
- Royal Society via an RSURF
- Swedish Research Council (VR) through the Oscar Klein Centre [2007-8709]
- French state funds [ANR-11-IDEX-0004-02]
- FCT-Portugal [PTDC/FIS/100170/2008]
- STFC [ST/M001946/1, ST/I000879/1, ST/I000976/1, ST/J001511/1] Funding Source: UKRI
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1009799] Funding Source: National Science Foundation
- Science and Technology Facilities Council [ST/J001511/1, ST/I000976/1, ST/M001946/1, ST/I000879/1] Funding Source: researchfish
One of the most promising ways to study the epoch of reionization (EoR) is through radio observations of the redshifted 21-cm line emission from neutral hydrogen. These observations are complicated by the fact that the mapping of redshifts to line-of-sight positions is distorted by the peculiar velocities of the gas. Such distortions can be a source of error if they are not properly understood, but they also encode information about cosmology and astrophysics. We study the effects of redshift space distortions on the power spectrum of 21-cm radiation from the EoR using large-scale N-body and radiative transfer simulations. We quantify the anisotropy introduced in the 21-cm power spectrum by redshift space distortions and show how it evolves as reionization progresses and how it relates to the underlying physics. We go on to study the effects of redshift space distortions on LOFAR observations, taking instrument noise and foreground subtraction into account. We find that LOFAR should be able to directly observe the power spectrum anisotropy due to redshift space distortions at spatial scales around k similar to 0.1 Mpc(-1) after greater than or similar to 1000 h of integration time. At larger scales, sample errors become a limiting factor, while at smaller scales detector noise and foregrounds make the extraction of the signal problematic. Finally, we show how the astrophysical information contained in the evolution of the anisotropy of the 21-cm power spectrum can be extracted from LOFAR observations, and how it can be used to distinguish between different reionization scenarios.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据