再电离时期前景的参数化：利用MWA对低频点源光谱的深度巡天
天体物理仪器与方法
2016-02-17 v1 宇宙学与河外天体物理
摘要
追求探测再电离时期(EoR)信号的实验依赖于低频处源谱的光谱平滑性。本文通过使用45小时观测，对MWA EoR场之一中586个最亮未分辨源测量高分辨率全偏振谱，实证探索了前景谱对EoR实验的影响。采用一种新颖的剥离方案从可见度中扣除2500个源，并进行电离层和波束校正，产生了迄今为止最深的、受混淆限制的MWA图像。结果发现所得光谱受仪器效应影响，这限制了对源本征光谱结构可设置的约束。分析了光谱的灵敏度和功率谱，发现残差的光谱主要由附近未反卷积源的PSF旁瓣主导。我们发布了一个描述每个测量源光谱参数的星表。
引用
@article{arxiv.1602.02247,
title = {Parametrising Epoch of Reionization foregrounds: A deep survey of low-frequency point-source spectra with the MWA},
author = {A. R. Offringa and C. M. Trott and N. Hurley-Walker and M. Johnston-Hollitt and B. McKinley and N. Barry and A. P. Beardsley and J. D. Bowman and F. Briggs and P. Carroll and J. S. Dillon and A. Ewall-Wice and L. Feng and B. M. Gaensler and L. J. Greenhill and B. J. Hazelton and J. N. Hewitt and D. C. Jacobs and H. -S. Kim and P. Kittiwisit and E. Lenc and J. Line and A. Loeb and D. A. Mitchell and M. F. Morales and A. R. Neben and S. Paul and B. Pindor and J. C. Pober and P. Procopio and J. Riding and S. K. Sethi and N. U. Shankar and R. Subrahmanyan and I. S. Sullivan and M. Tegmark and N. Thyagarajan and S. J. Tingay and R. B. Wayth and R. L. Webster and J. S. B. Wyithe},
journal= {arXiv preprint arXiv:1602.02247},
year = {2016}
}
备注
Accepted for publication in MNRAS. 15 pages, 16 figures. Catalogue of sources externally available as CSV file