论文标题
用分阶段馈送的HI强度映射调查
An HI intensity mapping survey with a Phased Array Feed
论文作者
论文摘要
我们报告了由Parkes望远镜上用梯形阵列（PAF）进行的中性氢（HI）强度映射调查的结果。该调查旨在在红移范围内覆盖约380度^2 0.3 <z <1（〜1.5 gpc^3的体积）在Wigglez Dark Energe调查覆盖的四个领域中。此处介绍的结果靶向狭窄的红移范围为0.73 <z <0.78，其中射频干扰（RFI）的影响较小。描述了数据减少和模拟管道，重点是标记RFI和校正数据减少过程中的信号丢失，尤其是由于前景减法方法。在HI强度图和Wigglez红移数据之间检测到互相关信号，平均幅度为<ΔT_BΔ__{OPT}> = 1.32 \ pm 0.42 mk（仅统计误差）。预计未来的Parkes低温PAF将以比以前更高的精度检测互相关信号，并允许在红移时测量宇宙HI密度至统一。
We report results from a neutral hydrogen (HI) intensity mapping survey conducted with a Phased Array Feed (PAF) on the Parkes telescope. The survey was designed to cover ~ 380 deg^2 over the redshift range 0.3 < z < 1 (a volume of ~ 1.5 Gpc^3) in four fields covered by the WiggleZ Dark Energy Survey. The results presented here target a narrow redshift range of 0.73 < z < 0.78 where the effect of radio frequency interference (RFI) was less problematic. The data reduction and simulation pipeline is described, with an emphasis on flagging of RFI and correction for signal loss in the data reduction process, particularly due to the foreground subtraction methodology. A cross-correlation signal was detected between the HI intensity maps and the WiggleZ redshift data, with a mean amplitude of<ΔT_bδ_{opt}> = 1.32 \pm 0.42 mK (statistical errors only). A future Parkes cryogenic PAF is expected to detect the cross-correlation signal with higher accuracy than previously possible and allow measurement of the cosmic HI density at redshifts up to unity.
