论文标题
大型星系合并具有独特的全球HI概况
Massive Galaxy Mergers Have Distinctive Global HI Profiles
论文作者
论文摘要
银河系的全局21 cm HI发射线轮廓编码有关中性原子气的空间分布和运动学的有价值信息。星系相互作用显着影响HI磁盘和集成HI线轮廓上可观察的功能。在这项工作中，我们研究了从大天文台中选择的全天文调查中选择的星系合并的中性原子气体。 HI光谱来自五百米的孔球形望远镜的新观察结果，以及来自档案数据的集合。我们使用新开发的方法量化了合并的HI轮廓，该方法使用了线轮廓的增长曲线。使用仔细选择的非合并星系的对照样品与合并样品的恒星质量相匹配，我们表明合并具有较大比例的单峰HI轮廓，以及HI中心速度偏离星系的全身光速速度的更大趋势。相比之下，合并的HI概况并不比非杂种者的非对称性更为不对称。
The global 21 cm HI emission-line profile of a galaxy encodes valuable information on the spatial distribution and kinematics of the neutral atomic gas. Galaxy interactions significantly influence the HI disk and imprint observable features on the integrated HI line profile. In this work, we study the neutral atomic gas properties of galaxy mergers selected from the Great Observatories All-sky LIRG Survey. The HI spectra come from new observations with the Five-hundred-meter Aperture Spherical Telescope and from a collection of archival data. We quantify the HI profile of the mergers with a newly developed method that uses the curve-of-growth of the line profile. Using a control sample of non-merger galaxies carefully selected to match the stellar mass of the merger sample, we show that mergers have a larger proportion of single-peaked HI profiles, as well as a greater tendency for the HI central velocity to deviate from the systemic optical velocity of the galaxy. By contrast, the HI profiles of mergers are not significantly more asymmetric than those of non-mergers.
