论文标题
与Alicpt-1 CMB镜头的CSST宇宙剪切断层扫描的互相关的预测
Forecast of cross-correlation of CSST cosmic shear tomography with AliCPT-1 CMB lensing
论文作者
论文摘要
我们介绍了一项关于来自西藏的Ali CMB极化望远镜（Alicpt-1）的中国调查空间望远镜（CSST）的宇宙剪切断层扫描与CMB镜头之间的互相关的预测研究。相关的星系和CMB镜头信号是根据基于输入的自动和跨光谱的高斯实现产生的。为了说明错误预算，我们考虑了基于Alicpt-1镜头重建管道的CMB镜头重建噪声；星系镜头测量的形状噪声； CSST照片 - $ z $错误；照片 - $ z $偏见；内在比对效应和乘法偏差。 Alicpt-1 CMB镜头模拟数据是根据两个实验阶段生成的，即``4个模块*yr'''和``48个模块*yr''案例。我们根据CSST Photo-Z $分布在[0,4）$中估算4个断层扫描箱的横谱。从实现中重建伪 - 偏光后，我们计算了信噪比（SNR）。通过组合4个照片 - $ z $垃圾箱，总互相关SNR $ \ oft15 $（alicpt-1``4个模块*yr''）和snr $ \ oft22 $（alicpt-1``48个模块*yr''）。最后，我们研究了该互相关信号的宇宙学应用。由于对Galaxy镜头数据的负贡献，因此在模板拟合中不包括固有对齐（IA）将导致$σ_8$的0.6σ$增量。对于Alicpt-1的第一阶段和第二阶段，CSST宇宙剪切与CMB镜头的互相关在聚类振幅$σ_{σ_8} =^{+0.043} _ {-0.038} $或$σ_{s_8} $ {s_8} = {s_8} = {s_8} = \ pm pm 0.038} = \ pm pm 0.038} $σ_{σ_8} =^{+0.030} _ { - 0.027} $或$σ_{s_8} = \ pm 0.018 $。
We present a forecast study on the cross-correlation between cosmic shear tomography from the Chinese Survey Space Telescope (CSST) and CMB lensing from Ali CMB Polarization Telescope (AliCPT-1) in Tibet. The correlated galaxy and CMB lensing signals were generated from Gaussian realizations based on inputted auto- and cross-spectra. To account for the error budget, we considered the CMB lensing reconstruction noise based on the AliCPT-1 lensing reconstruction pipeline; shape noise of the galaxy lensing measurement; CSST photo-$z$ error; photo-$z$ bias; intrinsic alignment effect, and multiplicative bias. The AliCPT-1 CMB lensing mock data were generated according to two experimental stages, namely the ``4 modules*yr'' and ``48 modules*yr'' cases. We estimate the cross-spectra in 4 tomographic bins according to the CSST photo-$z$ distribution in the range of $z\in[0,4)$. After reconstructing the pseudo-cross-spectra from the realizations, we calculate the signal-to-noise ratio (SNR). By combining the 4 photo-$z$ bins, the total cross-correlation SNR$\approx15$ (AliCPT-1 ``4 modules*yr'') and SNR$\approx22$ (AliCPT-1 ``48 modules*yr''). Finally, we study the cosmological application of this cross-correlation signal. Excluding intrinsic alignment (IA) in the template fitting would lead to roughly a $0.6σ$ increment in $σ_8$ due to the negative IA contribution to the galaxy lensing data. For AliCPT-1 first and second stages, the cross-correlation of CSST cosmic shear with CMB lensing gives errors on the clustering amplitude $σ_{σ_8}=^{+0.043}_{-0.038}$ or $σ_{S_8}=\pm 0.031$ and $σ_{σ_8}=^{+0.030}_{-0.027}$ or $σ_{S_8}=\pm 0.018$, respectively.
