论文标题
来自Nancy Grace Roman Space望远镜测量的IA类型超新星的弱透镜放大倍率的预测宇宙学约束
Forecasting Cosmological Constraints from the Weak Lensing Magnification of Type Ia Supernovae Measured by the Nancy Grace Roman Space Telescope
论文作者
论文摘要
IA型超新星（SNE IA）的弱透镜放大倍率对物质的聚类敏感，并为SN IA距离测量值提供了独立的宇宙学探针。 Nancy Grace Roman Space望远镜对此测量非常敏感，因为它可以发现高红移SNE IA并以高精度进行测量。我们提出了一种方法，用于从观察数据中重建弱透镜放大倍倍的概率分布，$ p（μ）$，并使用它来限制宇宙学参数。我们发现，重建的$ P（μ）$可以通过拉伸的高斯分布准确地拟合，并用于测量$ $ $，$ξ_μ$的方差，可以将其与可能性分析中的理论预测进行比较。将我们的方法应用于罗马太空望远镜预期的一组真实模拟的SNE IA，我们发现使用sne ia的弱透镜放大倍率限制了物质密度$ω_m$和物质群集振幅$σ_8$的组合。仅SN IA距离就会导致比$ω_m$的1 \％测量更好。 SN IA弱透镜放大倍率和距离测量的组合导致$ \ sim $ 10 \％的测量$σ_8$。来自罗马的SNE IA将在限制宇宙学模型方面有力。
The weak lensing magnification of Type Ia Supernovae (SNe Ia) is sensitive to the clustering of matter, and provides an independent cosmological probe complementary to SN Ia distance measurements. The Nancy Grace Roman Space Telescope is uniquely sensitive to this measurement as it can discover high redshift SNe Ia and measure them with high precision. We present a methodology for reconstructing the probability distribution of the weak lensing magnification $μ$ of SNe Ia, $p(μ)$, from observational data, and using it to constrain cosmological parameters. We find that the reconstructed $p(μ)$ can be fitted accurately by a stretched Gaussian distribution, and used to measure the variance of $μ$, $ξ_μ$, which can be compared to theoretical predictions in a likelihood analysis. Applying our methodology to a set of realistically simulated SNe Ia expected from the Roman Space Telescope, we find that using the weak lensing magnification of the SNe Ia constrains a combination of matter density $Ω_m$ and matter clustering amplitude $σ_8$. SN Ia distances alone lead to a better than 1\% measurement of $Ω_m$. The combination of SN Ia weak lensing magnification and distance measurements result in a $\sim$ 10\% measurement on $σ_8$. The SNe Ia from Roman will be powerful in constraining the cosmological model.
