Using the Sun to Measure the Primary Beam Response of the Canadian Hydrogen Intensity Mapping Experiment
CHIME Collaboration, Mandana Amiri, Kevin Bandura, Anja Boskovic, Jean-François Cliche, Meiling Deng, Matt Dobbs, Mateus Fandino, Simon Foreman, Mark Halpern, A… 展开作者
CHIME Collaboration, Mandana Amiri, Kevin Bandura, Anja Boskovic, Jean-François Cliche, Meiling Deng, Matt Dobbs, Mateus Fandino, Simon Foreman, Mark Halpern, Alex S. Hill, Gary Hinshaw, Carolin Höfer, Joseph Kania, T. L. Landecker, Joshua MacEachern, Kiyoshi Masui, Juan Mena-Parra, Laura Newburgh, Anna Ordog, Tristan Pinsonneault-Marotte, Ava Polzin, Alex Reda, J. Richard Shaw, Seth R. Siegel, Saurabh Singh, Keith Vanderlinde, Haochen Wang, James S. Willis, Dallas Wulf
We present a beam pattern measurement of the Canadian Hydrogen Intensity Mapping Experiment (CHIME) made using the Sun as a calibration source. As CHIME is a pure drift scan instrument, we rely on the seasonal North-South motion of the Sun to probe the beam at different elevations. This semiannual range in elevation, combined with the radio brightness of the Sun, enables a beam measurement which spans ~7,200 square degrees on the sky without the need to move the telescope. We take advantage of observations made near solar minimum to minimize the impact of solar variability, which is observed to be <10% in intensity over the observation period. The resulting data set is highly complementary to other CHIME beam measurements -- both in terms of angular coverage and systematics -- and plays an important role in the ongoing program to characterize the CHIME primary beam.
Project management of the Canadian Hydrogen Observatory and Radio-transient Detector
McGill University(麦吉尔大学);National Research Council Canada(加拿大国家研究委员会);Perimeter Institute for Theoretical Physics(珀米特理论物理研究所);University of Toronto(多伦多大学)
Matched Filtering for the Canadian Hydrogen Observatory and Radio-Transient Detector Galaxy Search
Perimeter Institute for Theoretical Physics;Waterloo Center for Astrophysics, University of Waterloo(滑铁卢大学天体物理中心);Queen’s University(女王大学);Arizona State University(亚利桑那州立大学)
Flux Density Calibration of Radio Bursts Detected in the Sidelobes of the Canadian Hydrogen Intensity Mapping Experiment
York University(约克大学);ASTRON, Netherlands Institute for Radio Astronomy(荷兰射电天文研究所);UvA(阿姆斯特丹大学);MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology(麻省理工学院卡弗里天体物理与空间研究研究所);Department of Physics, Massachusetts Institute of Technology(麻省理工学院物理学系);Laboratoire d’Astrophysique de Marseille, Aix-Marseille Univ.(马赛天体物理实验室,艾克斯-马赛大学)
Beam Maps of the Canadian Hydrogen Intensity Mapping Experiment (CHIME) Measured with a Drone
Yale University(耶鲁大学);McGill University(麦吉尔大学);Trottier Space Institute, McGill University(麦吉尔大学特罗蒂尔太空研究所);University of British Columbia(不列颠哥伦比亚大学);West Virginia University(西弗吉尼亚大学);Center for Gravitational Waves and Cosmology, West Virginia University(西弗吉尼亚大学引力波与宇宙学中心);Johns Hopkins University Applied Physics Laboratory(约翰斯·霍普金斯大学应用物理实验室);Jet Propulsion Laboratory, California Institute of Technology(加州理工学院喷气推进实验室);Dunlap Institute for Astronomy and Astrophysics, University of Toronto(多伦多大学邓普勒天文学与天体物理学研究所);David A. Dunlap Department of Astronomy and Astrophysics, University of Toronto(多伦多大学大卫·A·邓普勒天文学与天体物理学系);University of British Columbia, Okanagan Campus(不列颠哥伦比亚大学奥卡纳根校区);Dominion Radio Astrophysical Observatory, Herzberg Astronomy and Astrophysics Research Center, National Research Council Canada(加拿大国家研究委员会赫茨伯格天文学与天体物理学研究中心 Dominion 射电天文台);Center for Astrophysics, Harvard and Smithsonian(哈佛史密森尼天体物理中心);Brookhaven National Laboratory(布鲁克海文国家实验室);Perimeter Institute for Theoretical Physics(理论物理前沿研究所)
Overview of the Canadian Hydrogen Observatory and Radio Transient Detector (CHORD) Project
West Virginia University(西弗吉尼亚大学);University of Calgary(卡尔加里大学);McGill University(麦吉尔大学);INAF – Istituto di Radioastronomia(意大利国家天体物理研究所射电天文研究所);Rhodes University(罗德斯大学);South African Radio Astronomy Observatory(南非射电天文台);Queen’s University(女王大学);University of British Columbia, Okanagan Campus(不列颠哥伦比亚大学奥肯那根校区);Dunlap Institute for Astronomy & Astrophysics, University of Toronto(多伦多大学邓普天文学与天体物理学研究所);David A. Dunlap Department of Astronomy & Astrophysics, University of Toronto(多伦多大学大卫·A·邓普克天文学与天体物理学系);Arizona State University(亚利桑那州立大学);Anton Pannekoek Institute for Astronomy, University of Amsterdam(阿姆斯特丹大学安东·潘内库克天文学研究所);ASTRON, Netherlands Institute for Radio Astronomy(荷兰射电天文研究所ASTRON)
Holographic Beam Mapping of the CHIME Pathfinder Array
加拿大氢强度测绘实验(CHIME)探路者射电望远镜目前正在400至800兆赫之间测量北半球。通过对中性氢在$z \sim 0.8-2.5$ CHIME之间的红移21厘米谱线的测量,绘制出中性氢的大尺度结构图,将有助于我们对暗能量的理解。明亮的天体物理前景必须从中性氢信号中分离出来,这一任务需要对偏振的望远镜光束进行精确的表征。使用DRAO John A. Galt26米望远镜,我们已经开发了一种全息仪器和技术映射CHIME探路者光束.我们报告的文书和这一努力的初步成果的状态。
Characterization of the John A. Galt telescope for radio holography with CHIME
加拿大氢强度测绘实验(CHIME)将测量天体物理中性氢的21厘米发射,以探测红移z = 0.8 - 2.5的大尺度结构。然而,在明显更明亮的前景下检测21厘米的信号仍然是一个关键挑战。由于21厘米和前景发射之间的高动态范围,需要对仪器系统进行精密校准,特别是望远镜光束,以成功地过滤出前景。用于实现CHIME波束的高保真度测量的一种技术是无线电全息术,其中来自CHIME的每个模拟输入的信号与来自共同定位的参考天线(26 m John A. 26米的Galt望远镜跟踪一个经过CHIME的亮点源。在这项工作中,我们提出了一个分析的几个Galt望远镜的属性。我们采用漂移扫描测量的几个明亮的来源,以及来自408 MHz Haslam地图的背景估计,估计Galt系统的温度。为了确定Galt望远镜的光束形状,我们对明亮的射电源仙后座A进行了光栅扫描并进行了分析。最后,我们使用早期的全息测量来测量高尔特望远镜的几何形状相对于CHIME的CHIME和高尔特干涉数据集的全息分析。