论文标题
在z = 2.82的高光亚毫米星系中解决合并
Resolving a merger in a hyper-luminous submillimeter galaxy at z=2.82
论文作者
论文摘要
我们介绍了$ z = 2.82 $超发光红外星系（Hylirg）HS170850.1的解决属性，这是在Scuba-2随访中发现的最明亮的850 $ $ $ m $ m的源，可用于Keck Baryonic结构调查领域（S $ _ {\ s $ _ {\850μm850μmmim850μmim} = $ 19.5 mjy）红移。使用IRAM-NOEMA干涉仪在最高分辨率A-configuration中，我们将源分为两个组件，分别由$ \ sim $ 8 kpc隔开，可见为蓝色移位和红色转移$^{12} $ CO（5-4）线，展示了两个大量合并的预期动力学特性，这是两个气体富含气体之间的预期动力学特性。合并的合并系统被追溯到2.3 $'''$或18.3 kpc。合并的每个组成部分显示有序的气体运动，暗示了大规模湍流磁盘。我们将蓝色和红色磁盘的质量评估为（1.5 $ \ pm $ 0.2）$ \ times10^{11} $ m $ _ \ odot $和（0.71 $ \ pm $ 0.22）$ \ times10^{11} $ _ \ odot $。更大的磁盘组件在CO线中显示出宽大的翅膀，被主要轴沿磁盘质心$ 3 kpc偏移，并延伸到速度$ \ sim \ pm $ 1000 km $ \ rm \ rm {s^{ - 1}}} $来自系统性速度。我们将其解释为可能的双极流出成分，或者更可能是CO磁盘中的翘曲或潮汐结构。将HS170850.1与其他亚毫米计检测到的星系进行比较，具有相对明亮的850 $ $ m $ m的发光度，这表明正在进行的富含气体的合并，或至少一个群集/组环境，导致这些最极端的星空爆炸阶段。
We present the resolved properties of the $z=2.82$ Hyper Luminous Infrared Galaxy (HyLIRG) HS170850.1, the brightest 850$μ$m source found in the SCUBA-2 followup to the Keck Baryonic Structure Survey fields (S$_{\rm 850 μm}=$19.5 mJy), and amongst the most luminous starbursts known at any redshift. Using the IRAM-NOEMA interferometer in the highest resolution A-configuration, we resolve the source into two components separated by $\sim$8 kpc, visible as blue shifted and red shifted $^{12}$CO(5-4) lines, exhibiting the expected kinematic properties of a major merger between two gas-rich galaxies. The combined merger system is traced over 2.3$''$ or 18.3 kpc. Each component of the merger shows ordered gas motions suggestive of a massive, turbulent disk. We measure the masses of the blue and red disks as (1.5 $\pm$ 0.2) $\times10^{11}$ M$_\odot$ and (0.71 $\pm$ 0.22) $\times10^{11}$ M$_\odot$ respectively. The more massive disk component shows broad wings in the CO line, offset by $\sim$3 kpc from the disk centroid along the major axis, and extending to velocities $\sim\pm$1000 km $ \rm{s^{-1}}$ from systemic velocity. We interpret this as either a possible bipolar outflowing component, or more likely a warping or tidal structure in the CO disk. Comparing the properties of HS170850.1 to other submillimeter detected galaxies with comparably bright 850$μ$m luminosities suggests that ongoing gas-rich mergers, or at least a clustered/group environment lead to these most extreme starburst phases.
