利用MeerKAT进行HI强度映射:与WiggleZ星系交叉相关的功率谱探测
宇宙学与河外天体物理
2022-11-09 v2
摘要
我们报告了MeerKAT射电强度图与WiggleZ暗能量巡天星系之间相关成团的探测结果。我们发现交叉相关功率谱有的探测显著性,其振幅正比于HI密度分数()、HI偏置()与交叉相关系数()的乘积。因此我们获得约束,在有效尺度处。强度图来自MeerKAT望远镜的先导巡天,该望远镜是SKA天文台(SKAO)的64碟路径finder阵列。数据来自六夜内使用MeerKAT的L波段接收机对WiggleZ的11hr场区在频率范围(红移0.4000.459)进行的10.5小时观测。该探测是面向宇宙学的多碟自相关强度映射技术的首次实际演示,标志着SKAO宇宙学科学路线图中的重要里程碑。
引用
@article{arxiv.2206.01579,
title = {HI intensity mapping with MeerKAT: power spectrum detection in cross-correlation with WiggleZ galaxies},
author = {Steven Cunnington and Yichao Li and Mario G. Santos and Jingying Wang and Isabella P. Carucci and Melis O. Irfan and Alkistis Pourtsidou and Marta Spinelli and Laura Wolz and Paula S. Soares and Chris Blake and Philip Bull and Brandon Engelbrecht and José Fonseca and Keith Grainge and Yin-Zhe Ma},
journal= {arXiv preprint arXiv:2206.01579},
year = {2022}
}
备注
11 pages, 7 figures. See Fig.5 for the main result, showing the cross-power spectrum between MeerKAT and WiggleZ, revealing the 7.7\sigma detection. v2 is the version accepted for publication by MNRAS. The main changes from v1 were in introducing the radio intensity mapping data