利用内部误差估计技术从5年SNLS数据估计Ia型超新星的弱透镜会聚相关
宇宙学与河外天体物理
2019-11-19 v2 广义相对论与量子宇宙学
摘要
我们报道了来自5年超新星遗产巡天(SNLS)数据的Ia型超新星的非零弱透镜会聚相关信号。在分析中,我们利用弱透镜极限下5年SNLS的296个超新星放大数据。所用数据由来自四个不同天区的测量合并而成,每个天区覆盖1平方度天空。我们证明,利用内部误差估计技术,可由该数据很好地估计两点相关函数。为良好估计相应的协方差矩阵,我们采用自助空间重采样技术,将含296个数据点的原始数据重排100至10000次,并与原始数据点所得结果比较。我们表明,即便原始数据集数据点数量较少,该技术亦有助于我们就弱透镜会聚得出可靠结论。这也使我们能够极为精确地计算相应的协方差矩阵。
引用
@article{arxiv.1911.03474,
title = {Estimating weak lensing convergence correlation of Type-Ia supernovae from 5-year SNLS data by internal error estimate technique},
author = {Ayan Mitra and Arnab Paul and Barun Pal and Supratik Pal},
journal= {arXiv preprint arXiv:1911.03474},
year = {2019}
}
备注
A manuscript using the same data but with a preliminary level of analysis was submitted to arXiv on February, 2018 (arxiv:1802.09014, Now withdrawn). However, we have done a thorough modification to that version with a completely new method of analysis using updated technique leading to several new findings and request the arXiv admin to consider it as a fresh submission