ACES VIII：CS(2-1)中致密高速特征巡天
ACES VIII: A Survey of Compact, High-Velocity Features Observed in CS(2-1)
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中文总结 AI 辅助
利用ACES的CS(2-1)数据识别235个高速度弥散致密云，分析其物理运动学性质及谱线比率，揭示棒旋臂气体吸积和核内流入过程。
中文摘要 AI 辅助
银河系中心分子区（CMZ）的极端运动学受到动力学剪切、云碰撞和恒星反馈等过程的影响。这些事件在分子数据中表现为位置-速度（PV）图中的垂直尖峰特征，称为高速度弥散致密云（HVCC）。利用ALMA CMZ巡天（ACES）的CS(2-1)分子数据，我们共识别出235个HVCC候选体，其中163个通过目视识别，另有72个通过自动树状图方法识别。针对每个HVCC，我们编目并报告其物理和运动学性质，探索冷致密气体示踪剂\HNCO与C型激波示踪剂的谱线比率，对其PV图的形态进行分类，并查看其位置-位置-速度分布。该样本包含致密（d<5 pc）且速度范围大（20 km/s < $\Delta \mathrm{V}$ < 140 km/s）的结构，大多数结构呈现细长的“尖峰”状PV形态。我们重点指出了已知轨道流边缘处HNCO与C型激波示踪剂比率较高的区域，暗示棒旋臂气体吸积到CMZ的积累过程。我们还发现一组HVCC与50 km/s云及已知环核盘特征重叠。该星表将用于未来研究核内流入以及确定破坏CMZ平均气体流的主要机制。
英文摘要
The extreme kinematics of the Milky Way's Central Molecular Zone (CMZ) are influenced by processes such as dynamical shearing, cloud collisions, and stellar feedback. These events are visible in molecular data as vertically spiked features in position-velocity (PV) diagrams referred to as high velocity dispersion compact clouds (HVCCs). Using ALMA CMZ Exploration Survey (ACES) CS (2-1) molecular data, we identify a total of 235 HVCC candidates, 163 of which are visually identified, and an additional 72 identified via automated dendrogram methods. For each HVCC we catalog and report the physical and kinematic properties, explore line ratios of the cold dense gas tracer \HNCO with C-shock tracers, classify the morphology of their PV diagrams, and view their position-position-velocity distribution. The sample includes structures which are compact (d<5 pc) and have large velocity extents (20 km/s $<Δ\mathrm{V} <$ 140 km/s), with most structures showing thin, `spiked' PV morphologies. We highlight areas of high ratios between HNCO and C-shock tracers along the edge of known orbital streams, implying a buildup of bar lane gas accreting onto the CMZ. We also find a collection of HVCCs overlapping with the 50 km/s cloud and known circumnuclear disk features. This catalog will be used for future investigation of nuclear inflow and determining dominant mechanisms disrupting average CMZ gas flows.
发表机构
- University of Connecticut（康涅狄格大学）
- University of Florida（佛罗里达大学）
- University of Kansas（堪萨斯大学）
- Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, CAS（中国科学院国家天文台南美天体物理中心）
- Instituto de Astronomía, Universidad Católica del Norte（北天主教大学天文学研究所）
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