Full-sky maps for gravitational lensing of the cosmic microwave background
Full-sky maps for gravitational lensing of the cosmic microwave background
复制标题
宇宙微波背景引力透镜的全天空图
DOI：
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
S. Matarrese
中科院分区：
文献类型：
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作者：
C. Carbone;V. Springel;C. Baccigalupi;M. Bartelmann;S. Matarrese
我们利用大型宇宙学千禧年模拟（MS）构建了第一个全天空的透镜势和角度图，针对宇宙微波背景（CMB）的引力透镜，目标是适当地包括小尺度非线性和非高斯性。利用玻恩近似，我们实现了一个地图制作过程的基础上直接射线追踪通过引力势的MS。我们堆叠的模拟框中的红移壳到z 11，产生连续的全天空地图的角分辨率为arcmin。随机化方案避免结构沿视线沿着重复，并且添加大于MS盒尺寸的结构以提供大尺度（LS）结构对透镜效应信号的缺失贡献。投影透镜势的角功率谱和偏转角模量与尺度下到几个弧分的半解析估计相当吻合，而我们发现在小尺度上功率略微过剩，我们将其解释为MS中的非线性聚类。我们的绘图程序与LS添加技术相结合，非常适合于研究CMB各向异性的透镜，用于分析与前景结构的互相关，或其它次级CMB各向异性，例如Rees-Sciama效应。
We use the large cosmological Millennium Simulation (MS) to construct the first all-sky maps of the lensing potential and the angle, aiming at gravitational lensing of the cosmic microwave background (CMB), with the goal of properly including small-scale non-linearities and non-Gaussianity. Exploiting the Born approximation, we implement a map-making procedure based on direct ray tracing through the gravitational potential of the MS. We stack the simulation box in redshift shells up to z ∼ 11, producing continuous all-sky maps with arcmin angular resolution. A randomization scheme avoids the repetition of structures along the line of sight, and structures larger than the MS box size are added to supply the missing contribution of large-scale (LS) structures to the lensing signal. The angular power spectra of the projected lensing potential and the deflection-angle modulus agree quite well with semi-analytic estimates on scales down to a few arcmin, while we find a slight excess of power on small scales, which we interpret as being due to non-linear clustering in the MS. Our map-making procedure, combined with the LS adding technique, is ideally suited for studying lensing of CMB anisotropies, for analysing cross-correlations with foreground structures, or other secondary CMB anisotropies such as the Rees-Sciama effect.
DOI：
10.1111/j.1365-2966.2008.13190.x
发表时间：
2008-06-01
影响因子：
4.8
作者：
Hilbert, Stefan;White, Simon D. M.;Schneider, Peter
通讯作者：
Schneider, Peter