Extensive diffuse Lyman-α emission correlated with cosmic structure

Extensive diffuse Lyman-α emission correlated with cosmic structure
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与宇宙结构相关的广泛漫射莱曼-α发射

DOI:
10.1038/s41550-023-02054-1
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发表时间:
2023
期刊:
影响因子:
14.1
通讯作者:
Moore, Anna M.
Moore, Anna M.
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Martin, D. Christopher;Darvish, Behnam;Lin, Zeren;Cen, Renyue;Matuszewski, Mateusz;Morrissey, Patrick;Neill, James D.;Moore, Anna M.

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星系际介质代表了高红移重子的主要储存库,追踪了由暗物质主导的宇宙网络的结构,并为正在进行的星系演化提供了燃料。星系际介质的研究是利用准恒星天体的吸收线进行的,包括莱曼-α森林,但是这些吸收线不能提供发射图所能提供的信息。然而,由于低表面亮度和广泛的,漫反射的分布,直接检测相当于吸收莱曼-α森林的发射与现有的仪器和观测方法是不可能的。我们使用一台特制的仪器,通过双场减影和混洗,探测到一个发射莱曼-α森林。发射森林是高度扩展的,显示出丝状连接星系的结构形态,表现出类似吸收莱曼-α森林的统计数据,显示出类似吸收森林的光谱,并与星系跟踪的超密度相关,与暗物质的偏差一致。我们的结论是,发射莱曼-α森林可能提供了一个新的工具来跟踪重子和暗物质的宇宙网络的一个重要组成部分。
The intergalactic medium represents the dominant reservoir of baryons at high redshift, traces the architecture of the cosmic web dominated by dark matter and fuels ongoing galaxy evolution. The intergalactic medium has been studied using the absorption lines of quasi-stellar objects, including the Lyman-α forest, but these absorption lines are unable to provide the information that emission maps would give. However, because of the low surface brightness and extended, diffuse distribution, direct detection of an emission equivalent to the absorption Lyman-α forest has not been possible with existing instrumentation and observational approaches. Using a purpose-built instrument, with nod-and-shuffle and dual-field subtraction, we have detected an emission Lyman-α forest. The emission forest is highly extended, shows filamentary morphology with filaments connecting galaxies, exhibits statistics like the absorption Lyman-α forest, displays spectra resembling the absorption forest and is correlated with galaxy-traced overdensities consistent with bias like dark matter. We conclude that the emission Lyman-α forest may provide a new tool for tracing a substantial fraction of the cosmic web of baryons and dark matter.
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影响因子: 4.8
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