Very Small Array初步结果. II. CMB观测
天体物理学
2009-11-07 v2
摘要
我们利用Very Small Array在34 GHz波段观测了宇宙微波背景温度涨落,覆盖八个场,遍及三个互离的天空区域。共成像了101平方度,对角尺为3.6-0.4度(相当于角 multipole l=150-900)。我们描述了场的选择及观测策略。 在全分辨率图像中(合成束径 FWHM ~ 17 arcmin),热噪声通常为45微开尔文,CMB信号通常为55微开尔文。各场噪声水平均与望远镜的热噪声预期水平良好一致,未发现任何残余系统特征。相同CMB特征在独立、重叠观测中均被检测到。通过独立的15 GHz调查检测到离散射流源,并通过在34 GHz波段的定点跟踪观测消除了其影响。我们估计由于未消除射流源引起的残余混淆噪声小于14 mJy/beam(在全分辨率图像中相当于15微开尔文),其与热噪声正交叠加会使噪声水平提高6%。我们估计diffuse Galactic emission对图像的rms贡献小于6微开尔文。我们还呈现了在最大化CMB特征信噪比并在重叠区域拼接的图像,其中一些单个CMB特征的信噪比超过8。
引用
@article{arxiv.astro-ph/0205381,
title = {First results from the Very Small Array -- II. Observations of the CMB},
author = {Angela C. Taylor and Pedro Carreira and Kieran Cleary and Rod D. Davies and Richard J. Davis and Clive Dickinson and Keith Grainge and Carlos M. Gutierrez and Michael P. Hobson and Michael E. Jones and Rudiger Kneissl and Anthony Lasenby and J. P. Leahy and Klaus Maisinger and Guy G. Pooley and Rafael Rebolo and Jose Alberto Rubino-Martin and Ben Rusholme and Richard D. E. Saunders and Richard Savage and Paul F. Scott and Anze Slosar and Pedro J. Sosa Molina and David Titterington and Elizabeth Waldram and Robert A. Watson and Althea Wilkinson},
journal= {arXiv preprint arXiv:astro-ph/0205381},
year = {2009}
}
备注
11 pages, 5 figures, accepted for publication in MNRAS. Replaces original version - more detailed abstract, corrected typos