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標題:AMiBA: Cluster Sunyaev-Zel'dovich Effect Observations with the Expanded 13-Element Array
學年105
學期1
出版(發表)日期2016/10/20
作品名稱AMiBA: Cluster Sunyaev-Zel'dovich Effect Observations with the Expanded 13-Element Array
作品名稱(其他語言)
著者Kai-Yang Lin; Hiroaki Nishioka; Fu-Cheng Wang; Chih-Wei Locutus Huang; Yu-Wei Liao; Jiun-Huei Proty Wu; Patrick M. Koch; Keiichi Umetsu; Ming-Tang Chen; Shun-Hsiang Chan; Shu-Hao Chang; Wen-Hsuan Lucky Chang; Tai-An Cheng; Hoang Ngoc Duy; Szu-Yuan Fu; Chih-Chiang Han; Solomon Ho; Ming-Feng Ho; Paul T.P. Ho; Yau-De Huang; Homin Jiang; Derek Y. Kubo; Chao-Te Li; Yu-Chiung Lin; Guo-Chin Liu; Pierre Martin-Cocher; Sandor M. Molnar; Emmanuel Nunez; Peter Oshiro; Shang-Ping Pai; Philippe Raffin; Anthony Ridenour; Chia-You Shih; Sara Stoebner; Giap-Siong Teo; Jia-Long Johnny Yeh; Joshua Williams; Mark Birkinshaw
單位
出版者
著錄名稱、卷期、頁數The Astrophysical Journal 830:91 (21 pages)
摘要The Yuan-Tseh Lee Array for Microwave Background Anisotropy (AMiBA) is a co-planar interferometer array operating at a wavelength of 3 mm to measure the Sunyaev–Zel'dovich effect (SZE) of galaxy clusters at arcminute scales. The first phase of operation—with a compact 7-element array with 0.6 m antennas (AMiBA-7)—observed six clusters at angular scales from $5^{\prime} $ to $23^{\prime} $. Here, we describe the expansion of AMiBA to a 13-element array with 1.2 m antennas (AMiBA-13), its subsequent commissioning, and cluster SZE observing program. The most noticeable changes compared to AMiBA-7 are (1) array re-configuration with baselines ranging from 1.4 m to 4.8 m, allowing us to sample structures between $2^{\prime} $ and $10^{\prime} $, (2) 13 new lightweight carbon-fiber-reinforced plastic (CFRP) 1.2 m reflectors, and (3) additional correlators and six new receivers. Since the reflectors are co-mounted on and distributed over the entire six-meter CFRP platform, a refined hexapod pointing error model and phase error correction scheme have been developed for AMiBA-13. These effects—entirely negligible for the earlier central close-packed AMiBA-7 configuration—can lead to additional geometrical delays during observations. Our correction scheme recovers at least 80 ± 5% of the point-source fluxes. We, therefore, apply an upward correcting factor of 1.25 to our visibilities to correct for phase decoherence, and a ±5% systematic uncertainty is added in quadrature with our statistical errors. We demonstrate the absence of further systematics with a noise level consistent with zero in stacked uv-visibilities. From the AMiBA-13 SZE observing program, we present here maps of a subset of 12 clusters with signal-to-noise ratios above five. We demonstrate combining AMiBA-7 with AMiBA-13 observations on Abell 1689, by jointly fitting their data to a generalized Navarro–Frenk–White model. Our cylindrically integrated Compton-y values for five radii are consistent with results from the Berkeley-Illinois-Maryland Array, the Owens Valley Radio Observatory, the Sunyaev–Zel'dovich Array, and the Planck Observatory. We also report the first targeted SZE detection toward the optically selected 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.
關鍵字cosmic background radiation;galaxies: clusters: general;instrumentation: interferometers
語言英文
ISSN0004-637X;1538-4357
期刊性質國外
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國別美國
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