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arXiv 1004.3542astro-ph.COphysics.data-an
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用伪谱法重建剪切功率谱

Shear Power Spectrum Reconstruction using Pseudo-Spectrum Method

Chiaki Hikage, Masahiro Takada, Takashi Hamana, David Spergel

摘要:

我们发展了一种伪功率谱技术,用于测量全天空和平坦天空极限下弱透镜巡天的透镜功率谱。功率谱方法与传统的关联函数方法相比具有许多优点。我们测试的伪谱方法,通过使用数值模拟与方形的边界,包括掩蔽区域的复杂配置,由于明亮的恒星和饱和的尖峰。即使当25%的总面积的调查被掩盖,该方法恢复的E-模式功率谱在一个大范围的多极子100<1 <10000的次百分比精度。系统误差小于2000平方度测量的预期统计误差。残余B模式频谱在幅度上被很好地抑制在相对于E模式小于百分比的水平。我们还发现,测量几何效应引起的功率谱的相关误差并不显著。我们的方法适用于当前和即将到来的宽场透镜调查。

英文摘要:

We develop a pseudo power spectrum technique for measuring the lensing power spectrum from weak lensing surveys in both the full sky and flat sky limits. The power spectrum approaches have a number of advantages over the traditional correlation function approach. We test the pseudo spectrum method by using numerical simulations with square-shape boundary that include masked regions with complex configuration due to bright stars and saturated spikes. Even when 25% of total area of the survey is masked, the method recovers the E-mode power spectrum at a sub-percent precision over a wide range of multipoles 100<l<10000. The systematic error is smaller than the statistical errors expected for a 2000 square degree survey. The residual B-mode spectrum is well suppressed in the amplitudes at less than a percent level relative to the E-mode. We also find that the correlated errors of binned power spectra caused by the survey geometry effects are not significant. Our method is applicable to the current and upcoming wide-field lensing surveys.

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