通过[OI]63μm线揭示被吸收的原子宇宙
Uncovering the absorbed atomic Universe with the [OI]63um line
AI总结：
研究通过[OI]63μm线在高红移DSFGs中的探测，发现强吸收特征，揭示高红移星暴区域的气体和尘埃柱密度影响，限制了该线作为恒星形成诊断的效力。
摘要：
我们报告了在4.2<z<5.8的12个DSFGs样本中发现强吸收的[OI]63μm线。这是首个系统性调查z>4的[OI]63μm细结构线的调查。利用ALMA带9和10，我们获得空间和光谱分辨观测，探测到亚千秒尺度的星际介质。尽管灵敏度比大多数先前研究深10-100倍，我们仅在2个源中检测到[OI]63μm发射，显著性较低，其余星系在覆盖的完整速度范围内给出严格非检测，包括[CII]和[NII]205μm的稳健检测。我们识别出几个紧凑（0.05-0.2
英文摘要：
We report the discovery of strongly absorbed [OI]63um in a sample of 12 DSFGs at 4.2<z<5.8 selected from the SPT survey. This is the first systematic survey of the [OI]63um fine-structure line at z>4. Using ALMA Bands 9 and 10, we obtain spatially and spectrally resolved observations that probe the interstellar medium on sub-kpc scales. Despite reaching sensitivities 10-100x deeper than most previous studies, we detect [OI]63um in emission in only 2 sources at low significance, with the remaining galaxies yielding stringent non-detections over the full velocity range covered by robust detections of other far-infrared lines, including [CII] and [NII]205um. We identify several compact (0.05-0.2") regions having [OI]63um absorption against the far-infrared dust continuum, some of which are possibly reaching below rest-frame CMB radiation level. We also detect narrow, spatially localised [OI]63um emission "escape channels" preferentially detected in regions with weak or absent dust continuum emission. We predict that similar absorption effects may appear in the [CII] line, particularly when concentrating on the regions with the densest foreground material along the line of sight. The [OI]63um line appears to be originate from a mix of compact, high optical depth [OI]63um emitting regions and sub-thermally excited, oxygen-rich molecular clouds dispersed throughout high-redshift starbursts that are capable of absorbing the ground-state line emission. Combined with a comparison to cosmological radiation hydrodynamical simulations, this supports the interpretation that regions with higher gas and dust column densities may lead to weakening an intrinsically strong [OI]63um line emission. We argue that the high [OI]63um optical depth is the dominant effect causing the strong absorption, limiting the diagnostic power of this line to trace regions of massive star formation in high-redshift DSFGs.
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