SAMI-HI：星系中电离和中性氢原子气体的整体不对称性之间的联系
SAMI-HI: the connection between global asymmetry in the ionised and neutral atomic hydrogen gas in galaxies
摘要：
星系中中性氢原子（HI）气体的观测主要是空间分辨的，以全球HI谱线的形式。在量化全球HI光谱的不对称性（“全球HI不对称性”）方面已经做了大量的工作，但由于空间上无法分辨，仍然不知道不对称性跟踪星系的物理区域，以及其他气相是否受到影响。利用悉尼AAO多目标IFS（SAMI）巡天的光学积分场光谱仪（IFS）观测结果（SAMI-HI），我们研究了星系电离和中性气体库中不对称性之间的联系，以测试它们是否以及如何帮助我们更好地理解全球HI不对称性的起源。我们重建的全球H $α$谱线从IFS的观察，并发现，虽然一些全球H $α$不对称性可能会出现干扰电离气体运动学，大多数不对称的情况下，由H $α$发射气体的分布驱动。当相比的HI，我们没有发现全球H $α$和HI不对称性之间的关系的证据。此外，目视检查表明，星系具有定性相似的H $α$和HI光谱轮廓的情况下，可以是虚假的，与不规则的二维H $α$通量分布起源的相似性。我们的研究结果强调，全球H $α$和HI不对称性之间的比较是不直接的，许多全球HI不对称跟踪干扰，不显着影响星系的中心区域。
英文摘要：
Observations of the neutral atomic hydrogen (HI) gas in galaxies are predominantly spatially unresolved, in the form of a global HI spectral line. There has been substantial work on quantifying asymmetry in global HI spectra (`global HI asymmetry'), but due to being spatially unresolved, it remains unknown what physical regions of galaxies the asymmetry traces, and whether the other gas phases are affected. Using optical integral field spectrograph (IFS) observations from the Sydney AAO Multi-object IFS (SAMI) survey for which global HI spectra are also available (SAMI-HI), we study the connection between asymmetry in galaxies' ionised and neutral gas reservoirs to test if and how they can help us better understand the origin of global HI asymmetry. We reconstruct the global H$α$ spectral line from the IFS observations and find that, while some global H$α$ asymmetries can arise from disturbed ionised gas kinematics, the majority of asymmetric cases are driven by the distribution of H$α$-emitting gas. When compared to the HI, we find no evidence for a relationship between the global H$α$ and HI asymmetry. Further, a visual inspection reveals that cases where galaxies have qualitatively similar H$α$ and HI spectral profiles can be spurious, with the similarity originating from an irregular 2D H$α$ flux distribution. Our results highlight that comparisons between global H$α$ and HI asymmetry are not straightforward, and that many global HI asymmetries trace disturbances that do not significantly impact the central regions of galaxies.
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