Evidence of a Counterrotating Core in the Large Magellanic Cloud
Evidence of a Counterrotating Core in the Large Magellanic Cloud
复制标题
大麦哲伦星云中存在反向旋转核心的证据
DOI：
10.1086/430761
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
T. Prabhu
中科院分区：
文献类型：
--
作者：
A. Subramaniam;T. Prabhu
利用大麦哲伦云（LMC）中心区恒星径向速度资料，估算了它沿沿着不同位置角（P.A.）的径向速度曲线。的），包括节点线（LON）。径向速度剖面的中心部分，沿着LON，显示出一个V形剖面-一个明确的反向旋转的指示。反向旋转区域和次级杆具有相似的位置和P. A。反向旋转核心的起源可能是内部的（次级棒）或外部的（吸积）。为了解释所观察到的速度分布，我们提出了两个磁盘存在于内部LMC，与一个反向旋转。这个两盘模型被发现匹配H I速度以及。具有不同隆恩和速度分布的两个盘可以创建在运动学上和空间上分离的区域。它们的预测位置被发现匹配的观察到的位置，H I云被发现有两个速度。
Stellar radial velocity data in the central region of the Large Magellanic Cloud (LMC) are used to estimate its radial velocity curve along various position angles (P.A.'s), including the line of nodes (LON). The central part of the radial velocity profile, along the LON, shows a V-shaped profile—a clear indication of counterrotation. The counterrotating region and the secondary bar have similar location and P.A. The origin of the counterrotating core could be internal (a secondary bar) or external (accretion). To explain the observed velocity profile, we propose the existence of two disks in the inner LMC, with one counterrotating. This two-disk model is found to match the H I velocities as well. Two disks with different LONs and velocity profiles can create regions that are kinematically and spatially separated. Their predicted locations are found to match the observed locations where the H I clouds are found to have two velocities.