论文标题
大麦哲伦云磁盘中外部恒星翘曲的形状
Shape of the outer stellar warp in the Large Magellanic Cloud disk
论文作者
论文摘要
扭曲是星系恒星或气态磁盘的垂直扭曲。形成纱的拟议场景之一是星系之间的潮汐相互作用。最近的一项研究确定了大麦芽云（LMC）西南（SW）磁盘的外部区域的出色经线，并建议它可能是由于LMC和小麦哲伦云（SMC）之间的潮汐相互作用而起源的。由于数据的空间覆盖率有限，作者无法调查东北（NE）区域的该翘曲的对应物，这对于理解外部LMC翘曲的全球形状，性质和起源至关重要。在这项工作中，我们使用Gaia早期数据版本3（EDR3）的红色集团恒星的数据研究LMC磁盘的结构，该数据涵盖了整个麦哲伦系统。我们在NE外LMC磁盘中检测到了一个经线，该磁盘沿与SW外扭曲相同的方向偏离磁盘平面，但幅度较低。这表明外部LMC磁盘具有不对称的恒星经线，可能是U形经纱。我们的结果对旨在改善LMC-SMC相互作用历史的麦哲伦系统的理论模型提供了观察性约束。
Warps are vertical distortions of the stellar or gaseous disks of galaxies. One of the proposed scenarios for the formation of warps involves tidal interactions among galaxies. A recent study identified a stellar warp in the outer regions of the south-western (SW) disk of the Large Magellanic Cloud (LMC) and suggested that it might have originated due to the tidal interaction between the LMC and the Small Magellanic Cloud (SMC). Due to the limited spatial coverage of the data, the authors could not investigate the counterpart of this warp in the north-eastern (NE) region, which is essential to understanding the global shape, nature, and origin of the outer LMC warp. In this work, we study the structure of the LMC disk using data on red clump stars from the Gaia Early Data Release 3 (EDR3), which cover the entire Magellanic system. We detected a warp in the NE outer LMC disk which is deviated from the disk plane in the same direction as that of the SW outer warp, but with a lower amplitude. This suggests that the outer LMC disk has an asymmetric stellar warp, which is likely to be a U-shaped warp. Our result provides an observational constraint to the theoretical models of the Magellanic system aimed at improving the understanding the LMC-SMC interaction history.
