Non-circular beam correction to the CMB power spectrum

被引:8
|
作者
Souradeep, Tarun
Mitra, Sanjit
Sengupta, Anand
Ray, Subharthi
Saha, Rajib
机构
[1] Inter Univ Ctr Astron & Astrophys, Pune 411007, Maharashtra, India
[2] Sch Phys & Astron, Cardiff CF24 3YB, Wales
[3] Indian Inst Technol, Dept Phys, Kanpur 208016, Uttar Pradesh, India
关键词
cosmology; cosmic microwave background; theory; observations;
D O I
10.1016/j.newar.2006.09.011
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In the era of high precision CMB measurements, systematic effects are beginning to limit the ability to extract subtler cosmological information. The non-circularity of the experimental beam has become progressively important as CMB experiments strive to attain higher angular resolution and sensitivity. The effect of non-circular beam on the power spectrum is important at multipoles larger than the beam-width. For recent experiments with high angular resolution, optimal methods of power spectrum estimation are computationally prohibitive and sub-optimal approaches, such as the Pseudo-C, method are used. We provide an analytic framework for correcting the power spectrum for the effect of beam non-circularity and non-uniform sky coverage (including incomplete/masked sky maps). The approach is perturbative in the distortion of the beam from non-circularity allowing for rapid computations when the beam is mildly non-circular. We advocate that when the non-circular beams are important, it is computationally advantageous to employ 'soft' azimuthally apodized masks whose spherical harmonic transforms die down fast with m. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:1030 / 1035
页数:6
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