协同再电离时期的21厘米与亚毫米巡天：新的经验性见解
Synergizing 21 cm and sub-millimetre surveys during reionization: new empirical insights
AI总结：
结合ALMA的[CII]与[OIII]巡天数据和HI演化预测，研究z~5-7的21厘米与亚毫米强度映射交叉关联，发现FYST类实验可高信噪比探测相关功率谱，为约束再电离中后期亮源演化提供新见解。
摘要：
我们利用阿塔卡马大型毫米/亚毫米波阵列（ALMA）针对电离碳 [CII] 158 μm 和氧 [OIII] 88 μm 谱线巡天的最新结果，并结合数据驱动的中性氢（HI）演化预测，展示在 z ~ 5-7 范围内 21 厘米与亚毫米巡天之间强度映射交叉关联的前景。我们使用的数据集包括覆盖 z ~ 4.5-7 的 ALPINE 和 REBELS [CII] 巡天，以及覆盖 z ~ 6-9 的 ALMA [OIII] 探测结果。由此得到的 [CII] 光度-暗晕质量关系在高红移处可以用双幂律很好地描述，其最佳拟合参数与模拟结果高度一致。数据支持在增强型 Fred Young 亚毫米望远镜（FYST）类配置下，在所有红移处对 [CII] 自功率谱进行可靠探测。这样的实验与 Murchinson 宽场阵列（MWA）一起，将能够以几十到几百的信噪比测量 21 厘米-[CII] 交叉关联功率。我们发现，在低温大孔径强度映射实验（EXCLAIM）基础上改进的气球载实验，应能与 MWA 和平方公里阵列（SKA）-LOW 一起探测到 z ~ 7 的 21 厘米-[OIII] 交叉关联。我们的结果对于约束再电离中后期阶段亮源演化具有重要意义。
英文摘要：
We use the latest results from Atacama Large Millimetre/submillimetre Array (ALMA) surveys targeting the ionized carbon [CII] 158 $μ$m and oxygen [OIII] 88 $μ$m lines, in combination with data-driven predictions for the evolution of neutral hydrogen (HI), to illustrate the prospects for intensity mapping cross-correlations between 21 cm and submillimetre surveys over $z \sim 5-7$. We work with a dataset including the ALPINE and REBELS surveys for [CII] over $z \sim 4.5-7$, and ALMA [OIII] detections over $z \sim 6-9$. The resultant evolution of the [CII] luminosity - halo mass relation is well described by a double power law at high redshifts, with the best-fitting parameters in good agreement with the results of simulations. The data favour secure detections of the auto-power spectrum of [CII] at all redshifts with an enhanced Fred Young Submillimetre Telescope (FYST)-like configuration. Such an experiment, along with the Murchinson Widefield Array (MWA) will be able to measure the 21 cm - [CII] cross-correlation power with a signal-to-noise ratio of a few tens to a few hundreds. We find that a balloon-borne experiment improving upon the Experiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM) should be able to detect the 21 cm - [OIII] cross-correlation with the MWA and the Square Kilometre Array (SKA)-LOW out to $z \sim 7$. Our results have implications for constraining the evolution of luminous sources during the mid-to-end stages of reionization.
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