采用相控阵馈电的HI强度测绘勘测
An HI intensity mapping survey with a Phased Array Feed
摘要：
我们报告的结果中性氢（HI）强度映射调查进行了相控阵饲料（PAF）的帕克斯望远镜。这次巡天的目的是在WiggleZ暗能量巡天所涵盖的四个领域中，在红移范围0.3 < z < 1（体积约为1.5 Gpc^3）内覆盖约380 deg^2。这里给出的结果针对0.73 < z < 0.78的窄红移范围，其中射频干扰（RFI）的影响问题较少。数据减少和仿真流水线进行了描述，重点是标记RFI和校正信号丢失的数据减少过程中，特别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，其平均幅度<ΔT_bδ_{opt}> = 1.32 \pm 0.42 mK（仅统计误差）。一个未来的帕克斯低温PAF预计将检测到更高的精度比以前可能的互相关信号，并允许测量宇宙HI密度的红移高达1。
英文摘要：
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.
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