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Intensity Mapping of Lyα Emission during the Epoch of Reionization

机译:离子化时期Lyα发射的强度图

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摘要

We calculate the absolute intensity and anisotropies of the Lyα radiation field present during the epoch of reionization. We consider emission from both galaxies and the intergalactic medium (IGM) and take into account the main contributions to the production of Lyα photons: recombinations, collisions, continuum emission from galaxies, and scattering of Lyn photons in the IGM. We find that the emission from individual galaxies dominates over the IGM with a total Lyα intensity (times frequency) of about (1.43-3.57) × 10^(–8) erg s^(–1) cm^(–2) sr^(–1) at a redshift of 7. This intensity level is low, so it is unlikely that the Lyα background during reionization can be established by an experiment aiming at an absolute background light measurement. Instead, we consider Lyα intensity mapping with the aim of measuring the anisotropy power spectrum that has rms fluctuations at the level of 1 × 10^(–16) [erg s^(–1) cm^(–2) sr^(–1)]^2 at a few Mpc scales. These anisotropies could be measured with a spectrometer at near-IR wavelengths from 0.9 to 1.4 μm with fields in the order of 0.5 to 1 deg^2. We recommend that existing ground-based programs using narrow band filters also pursue intensity fluctuations to study statistics on the spatial distribution of faint Lyα emitters. We also discuss the cross-correlation signal with 21 cm experiments that probe H I in the IGM during reionization. A dedicated sub-orbital or space-based Lyα intensity mapping experiment could provide a viable complimentary approach to probe reionization, when compared to 21 cm experiments, and is likely within experimental reach.
机译:我们计算了在电离时代存在的Lyα辐射场的绝对强度和各向异性。我们考虑了来自星系和星际间介质(IGM)的发射,并考虑了对Lyα光子产生的主要贡献:重组,碰撞,星系的连续发射以及IGM中Lyn光子的散射。我们发现,单个星系的发射在IGM上占主导地位,总Lyα强度(倍频)约为(1.43-3.57)×10 ^(– 8)erg s ^(– 1)cm ^(– 2)sr ^ (–1)的红移为7。该强度级别较低,因此不太可能通过针对绝对背景光测量的实验来建立电离过程中的Lyα背景。相反,我们考虑使用Lyα强度映射,目的是测量均方根波动在1×10 ^(– 16)[erg s ^(– 1)cm ^(– 2)sr ^(– 1)] ^ 2(几个Mpc比例)。这些各向异性可用分光计在0.9至1.4μm的近红外波长下以0.5至1 deg ^ 2的量级进行测量。我们建议现有的使用窄带滤波器的地面程序也应进行强度涨落,以研究有关微弱Lyα发射体空间分布的统计数据。我们还讨论了21 cm实验的互相关信号,该实验在电离期间在IGM中探测HI。与21厘米实验相比,专用的亚轨道或基于空间的Lyα强度作图实验可以为探针电离提供可行的补充方法,并且可能在实验范围之内。

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