Analytic marginalization over CMB calibration and beam uncertainty

被引:73
作者
Bridle, SL
Crittenden, R
Melchiorri, A
Hobson, MP
Kneissl, R
Lasenby, AN
机构
[1] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
[2] DAMTP, Cambridge CB3 0HA, England
[3] Nucl & Astrophys Lab, Oxford OX1 3RH, England
[4] Univ Cambridge, Cavendish Lab, Astrophys Grp, Cambridge CB3 0HE, England
关键词
methods : statistical; cosmic microwave background; cosmology : observations; cosmology : theory;
D O I
10.1046/j.1365-8711.2002.05709.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
With the increased accuracy and angular scale coverage of the recent CMB experiments it has become important to include calibration and beam uncertainties when estimating cosmological parameters. This requires an integration over possible values of the calibration and beam size, which can be performed numerically but greatly increases computation times. We present a fast and general method for marginalization over calibration-type errors by analytical integration. This is worked through for the specific example of CMB calibration and beam uncertainties and the resulting formulae are practical to implement. We show how cosmological parameter constraints from the latest CMB data are changed when calibration/beam uncertainties are taken into account: typically the best-fitting parameters are shifted and the errors bars are increased by up to 50 per cent for e.g. n(s) and Omega(b)h(2); although as expected there is no change for Omega(K), because it is constrained by the positions of the peaks.
引用
收藏
页码:1193 / 1200
页数:8
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