PReBeaM FOR PLANCK: A POLARIZED REGULARIZED BEAM DECONVOLUTION MAP-MAKING METHOD

被引:14
作者
Armitage-Caplan, Charmaine [1 ]
Wandelt, Benjamin D. [1 ,2 ,3 ]
机构
[1] UIUC, Dept Phys, Urbana, IL 61801 USA
[2] UIUC, Dept Astron, Urbana, IL 61801 USA
[3] UIUC, Ctr Adv Studies, Urbana, IL 61801 USA
基金
美国国家科学基金会;
关键词
cosmic microwave background; cosmology: observations; methods: data analysis; ALGORITHM;
D O I
10.1088/0067-0049/181/2/533
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We describe a maximum-likelihood regularized beam deconvolution map-making algorithm for data from high-resolution, polarization-sensitive instruments, such as the Planck data set. The resulting algorithm, which we call PReBeaM, is pixel-free and solves for the map directly in spherical harmonic space, avoiding pixelization artifacts. While Fourier methods like ours are expected to work best when applied to smooth, large-scale asymmetric beam systematics ( such as far-side lobe effects), we show that our m-truncated spherical harmonic representation of the beam results in negligible reconstruction error-even for m as small as 4 for a polarized elliptically asymmetric beam. We describe a hybrid OpenMP/MPI parallelization scheme which allows us to store and manipulate the time-ordered data from satellite instruments with a typical full-sky scanning strategy. Finally, we apply our technique to noisy data and show that it succeeds in removing visible power spectrum artifacts without generating excess noise on small scales.
引用
收藏
页码:533 / 542
页数:10
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