AMiBA: Cluster Sunyaev-Zel'dovich Effect Observations with the Expanded 13-Element Array

• Published in: arXiv.org 2016-07
• Main Authors: Kai-Yang, Lin, Nishioka, Hiroaki, Fu-Cheng, Wang, Huang, Chih-Wei Locutus, Yu-Wei, Liao, Wu, Jiun-Huei Proty, Koch, Patrick M, Umetsu, Keiichi, Ming-Tang, Chen, Chan, Shun-Hsiang, Shu-Hao, Chang, Wen-Hsuan Lucky Chang, Tai-An, Cheng, Hoang, Ngoc Duy, Szu-Yuan Fu, Chih-Chiang, Han, Ho, Solomon, Ming-Feng, Ho, Ho, Paul T P, Yau-De, Huang, Jiang, Homin, Kubo, Derek Y, Chao-Te, Li, Yu-Chiung, Lin, Guo-Chin, Liu, Martin-Cocher, Pierre, Molnar, Sandor M, Nunez, Emmanuel, Oshiro, Peter, Shang-Ping Pai, Raffin, Philippe, Ridenour, Anthony, Chia-You Shih, Stoebner, Sara, Teo, Giap-Siong, Jia-Long, Johnny Yeh, Williams, Joshua, Birkinshaw, Mark
• Format: Article
• Language: English
• Subjects: Anisotropy; Antenna arrays; Antennas; Carbon fiber reinforced plastics; Correlators; Galactic clusters; Galaxies; Reflectors; Sunyaev-Zeldovich effect
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1605.09261

The Yuan-Tseh Lee Array for Microwave Background Anisotropy (AMiBA) is a co-planar interferometer array operating at a wavelength of 3mm to measure the Sunyaev-Zeldovich effect (SZE) of galaxy clusters. In the first phase of operation -- with a compact 7-element array with 0.6m antennas (AMiBA-7) -- we observed six clusters at angular scales from 5\arcmin to 23\arcmin. Here, we describe the expansion of AMiBA to a 13-element array with 1.2m antennas (AMiBA-13), its subsequent commissioning, and our cluster SZE observing program. The most important changes compared to AMiBA-7 are (1) array re-configuration with baselines ranging from 1.4m to 4.8m covering angular scales from 2\arcmin to 11.5\arcmin, (2) thirteen new lightweight carbon-fiber-reinforced plastic (CFRP) 1.2m reflectors, and (3) additional correlators and six new receivers. From the AMiBA-13 SZE observing program, we present here maps of a subset of twelve clusters. In highlights, we combine AMiBA-7 and AMiBA-13 observations of Abell 1689 and perform a joint fitting assuming a generalized NFW pressure profile. Our cylindrically integrated Compton-y values for this cluster are consistent with the BIMA/OVRA, SZA, and Planck results. We report the first targeted SZE detection towards the optically selected galaxy cluster RCS J1447+0828, and we demonstrate the ability of AMiBA SZE data to serve as a proxy for the total cluster mass. Finally, we show that our AMiBA-SZE derived cluster masses are consistent with recent lensing mass measurements in the literature.