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arXiv 1208.0050astro-ph.IMastro-ph.CO
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阿塔卡马宇宙学望远镜:数据特征和制图

The Atacama Cosmology Telescope: Data Characterization and Map Making

Rolando Dünner, Matthew Hasselfield, Tobias A. Marriage, Jon Sievers, Viviana Acquaviva, Graeme E. Addison, Peter A. R. Ade, Paula Aguirre, Mandana Amiri, John … 展开作者

Rolando Dünner, Matthew Hasselfield, Tobias A. Marriage, Jon Sievers, Viviana Acquaviva, Graeme E. Addison, Peter A. R. Ade, Paula Aguirre, Mandana Amiri, John William Appel, L. Felipe Barrientos, Elia S. Battistelli, J. Richard Bond, Ben Brown, Bryce Burger, Erminia Calabrese, Jay Chervenak, Sudeep Das, Mark J. Devlin, Simon R. Dicker, W. Bertrand Doriese, Joanna Dunkley, Thomas Essinger-Hileman, Ryan P. Fisher, Megan B. Gralla, Joseph W. Fowler, Amir Hajian, Mark Halpern, Carlos Hernández-Monteagudo, Gene C. Hilton, Matt Hilton, Adam D. Hincks, Renée Hlozek, Kevin M. Huffenberger, David H. Hughes, John P. Hughes, Leopoldo Infante, Kent D. Irwin, Jean Baptiste Juin, Madhuri Kaul, Jeff Klein, Arthur Kosowsky, Judy M. Lau, Michele Limon, Yen-Ting Lin, Thibaut Louis, Robert H. Lupton, Danica Marsden, Krista Martocci, Phil Mauskopf, Felipe Menanteau, Kavilan Moodley, Harvey Moseley, Calvin B. Netterfield, Michael D. Niemack, Michael R. Nolta, Lyman A. Page, Lucas Parker, Bruce Partridge, Hernán Quintana, Beth Reid, Neelima Sehgal, Blake D. Sherwin, David N. Spergel, Suzanne T. Staggs, Daniel S. Swetz, Eric R. Switzer, Robert Thornton, Hy Trac, Carole Tucker, Ryan Warne, Grant Wilson, Ed Wollack, Yue Zhao

摘要:

我们介绍了阿塔卡马宇宙望远镜(ACT)的2008年观测季节的数据减少和制图管道的描述。这里提供的148 GHz数据占ACT从2007年到2010年收集的90 TB数据的12%。2008年,我们观测了136天,总共产生了1423小时的数据(仅148 GHz频段就有11 TB),平均每天观测10.5小时。其中,1085小时用于以-52.7度为中心的850度^2条纹(11.2小时乘9.1度),而175小时用于以天赤道为中心的280度^2条纹(4.5小时乘4.8度)。我们讨论了统计和系统噪声的来源,校准,望远镜指向和数据选择。在1260个调查小时和每个阵列1024个探测器中,在该频带的数据选择之后,剩余816个小时和593个有效探测器,产生38%的调查效率。2008年的总灵敏度(根据时序数据流(TOD)中5 Hz和20 Hz之间的噪声水平确定)为32微开尔文平方米(CMB单位)。大气亮度波动构成的数据中的主要污染物和占主导地位的探测器噪声协方差在低频率的TOD。通过使用预条件共轭梯度方法解决最小二乘问题,结合检测器和噪声相关性的细节,制作了这些地图。与WMAP天空图的互相关,以及模拟分析,表明我们的地图是无偏的多极ell > 300。本文伴随着2008年148 GHz南部条纹地图的公开发布。本文所述的技术将应用于未来的地图和数据发布。

英文摘要:

We present a description of the data reduction and mapmaking pipeline used for the 2008 observing season of the Atacama Cosmology Telescope (ACT). The data presented here at 148 GHz represent 12% of the 90 TB collected by ACT from 2007 to 2010. In 2008 we observed for 136 days, producing a total of 1423 hours of data (11 TB for the 148 GHz band only), with a daily average of 10.5 hours of observation. From these, 1085 hours were devoted to a 850 deg^2 stripe (11.2 hours by 9.1 deg) centered on a declination of -52.7 deg, while 175 hours were devoted to a 280 deg^2 stripe (4.5 hours by 4.8 deg) centered at the celestial equator. We discuss sources of statistical and systematic noise, calibration, telescope pointing, and data selection. Out of 1260 survey hours and 1024 detectors per array, 816 hours and 593 effective detectors remain after data selection for this frequency band, yielding a 38% survey efficiency. The total sensitivity in 2008, determined from the noise level between 5 Hz and 20 Hz in the time-ordered data stream (TOD), is 32 micro-Kelvin sqrt{s} in CMB units. Atmospheric brightness fluctuations constitute the main contaminant in the data and dominate the detector noise covariance at low frequencies in the TOD. The maps were made by solving the least-squares problem using the Preconditioned Conjugate Gradient method, incorporating the details of the detector and noise correlations. Cross-correlation with WMAP sky maps, as well as analysis from simulations, reveal that our maps are unbiased at multipoles ell > 300. This paper accompanies the public release of the 148 GHz southern stripe maps from 2008. The techniques described here will be applied to future maps and data releases.

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