再电离结束时Ly $α$发射II的德克萨斯光谱搜索。$z\gtrsim7$最深近红外光谱观测
Texas Spectroscopic Search for Ly$α$ Emission at the End of Reionization II. The Deepest Near-Infrared Spectroscopic Observation at $z\gtrsim7$
摘要：
要实现利用Ly $α$辐射来跟踪星系际介质（IGM）在再电离时期的演化，需要在$z\sim7.2$处的光学和近红外（NIR）光谱仪的边界上进行深光谱分析，此时Ly $α$辐射为$\sim$ 1 $μ$ m。我们在再电离结束时对Ly $α$发射的德克萨斯光谱搜索包括使用Keck DEIMOS（光学）和MOSFIRE（NIR）光谱仪进行的18个夜晚的深层光谱观测。在这个数据集内，我们观察Ly $α$发射从183光度红移选定的星系在$z =$ 5.5 - 8.3从宇宙大会近红外深河外遗留调查（CANDELS）。我们的重叠MOSFIRE观测，超过84个星系的总数，提供了最深的近红外光谱数据尚未获得的Ly $α$从星系$z > 7$，与$>16$小时积分时间为4个观测星系。在这里，我们分析了这四个靶标，我们报告了新的$z = 7.60$ Ly $α$检测的发现，并提供了Finkelstein等人（2013）先前确认的$z=7.51$ Ly $α$发射的更新观察结果，其中$\sim$ 3 $\times$暴露时间更长。我们对这些Ly $α$发射线轮廓的分析揭示了显著的不对称形状。从明亮的光源（$M_{\text{UV}}<-20.25$）中检测到的两条Ly $α$发射线可能意味着这些明亮的星系居住在部分中性的IGM中的电离气泡中，尽管更深的曝光可能会揭示更暗的光源中的Ly $α$发射。
英文摘要：
Realizing the utility of Ly$α$ emission to trace the evolution of the intergalactic medium (IGM) during the epoch of reionization requires deep spectroscopy across the boundary of optical and near-infrared (NIR) spectrographs at $z\sim7.2$ when Ly$α$ emission is at $\sim$1$μ$m. Our Texas Spectroscopic Search for Ly$α$ Emission at the End of Reionization includes 18 nights of deep spectroscopic observations using the Keck DEIMOS (optical) and MOSFIRE (NIR) spectrographs. Within this dataset we observe Ly$α$ emission from 183 photometric-redshift selected galaxies at $z =$ 5.5 - 8.3 from the Cosmic Assembly Near infrared Deep Extragalactic Legacy Survey (CANDELS). Our overlapping MOSFIRE observations, over 84 galaxies total, provide the deepest NIR spectroscopic data yet obtained for Ly$α$ from galaxies $z > 7$, with $>16$ hr integration time for four observed galaxies. Here we analyze these four targets, and we report the discovery of a new $z = 7.60$ Ly$α$ detection as well as provide an updated observation of the previously confirmed $z=7.51$ Ly$α$ emission from Finkelstein et al. (2013) with a $\sim$3$\times$ longer exposure time. Our analysis of these Ly$α$ emission line profiles reveal a significant asymmetric shape. The two detected Ly$α$ emission lines from bright sources ($M_{\text{UV}}<-20.25$) could imply that these bright galaxies inhabit ionized bubbles in a partially neutral IGM, although deeper exposures may yet reveal Ly$α$ emission in the fainter sources.
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