GLEAM：银河与河外全天空MWA巡天
天体物理仪器与方法
2017-08-23 v1 宇宙学与河外天体物理
星系天体物理
摘要
GLEAM（银河与河外全天空MWA巡天）是一项利用默奇森宽场阵列（MWA）进行的巡天，覆盖赤纬+25度以南的整个射电天空，频率范围为72至231 MHz，采用漂移扫描方法，高效利用了MWA极大的视场。我们介绍了GLEAM的观测细节、成像策略和理论灵敏度。该巡天持续两年，第一年使用40 kHz频率分辨率和0.5 s时间分辨率，第二年使用10 kHz频率分辨率和2 s时间分辨率。所得图像分辨率和灵敏度取决于观测频率、天空指向和图像加权方案。在154 MHz处，图像分辨率约为2.5 × 2.2/cos(DEC+26.7)角分，对尺度达约10度的结构敏感。我们提供了根据指向和频率计算GLEAM马赛克图预期热噪声的表格，并讨论了斯托克斯I图像中达到理论噪声的限制。我们讨论了GLEAM面临的挑战及其解决方案，包括电离层对源位置和线偏振辐射的影响，以及MWA主波束固有的仪器偏振效应。
引用
@article{arxiv.1505.06041,
title = {GLEAM: The GaLactic and Extragalactic All-sky MWA survey},
author = {R. B. Wayth and E. Lenc and M. E. Bell and J. R. Callingham and K. S. Dwarakanath and T. M. O. Franzen and B. -Q. For and B. Gaensler and P. Hancock and L. Hindson and N. Hurley-Walker and C. A. Jackson and M. Johnston-Hollitt and A. D. Kapinska and B. McKinley and J. Morgan and A. R. Offringa and P. Procopio and L. Staveley-Smith and C. Wu and Q. Zheng and C. M. Trott and G. Bernardi and J. D. Bowman and F. Briggs and R. J. Cappallo and B. E. Corey and A. A. Deshpande and D. Emrich and R. Goeke and L. J. Greenhill and B. J. Hazelton and D. L. Kaplan and J. C. Kasper and E. Kratzenberg and C. J. Lonsdale and M. J. Lynch and S. R. McWhirter and D. A. Mitchell and M. F. Morales and E. Morgan and D. Oberoi and S. M. Ord and T. Prabu and A. E. E. Rogers and A. Roshi and N. Udaya Shankar and K. S. Srivani and R. Subrahmanyan and S. J. Tingay and M. Waterson and R. L. Webster and A. R. Whitney and A. Williams and C. L. Williams},
journal= {arXiv preprint arXiv:1505.06041},
year = {2017}
}
备注
17 pages, 7 Figures, 4 tables. Accepted for publication in the Publications of the Astronomical Society of Australia (PASA)