Young stars in the periphery of the Large Magellanic Cloud

Young stars in the periphery of the Large Magellanic Cloud
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大麦哲伦星云外围的年轻恒星

DOI:
10.1093/mnras/stw3242
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发表时间:
2016-12
影响因子:
4.8
通讯作者:
van Altena William F.
van Altena William F.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhang Lan;Korchagin Vladimir I;Vieira Katherine;van Altena William F.

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尽管它们距离很近,但两个麦哲伦星云和银河系之间复杂的相互作用,以及由此产生的潮汐特征,仍然知之甚少。最近的研究表明,大麦哲伦星云(LMC)的外围有一个非常大的圆盘,它的边缘受到了明显的扰动。我们在距离大星云中心约30度的远郊寻找最近形成的恒星。我们收集了LMC外围31颗年轻候选恒星的中分辨率光谱,并测量了它们的径向速度、恒星参数、距离和年龄。我们的测量确认了六个目标的LMC成员,它们的径向速度和距离值与云的非常匹配。这些天体都是年轻的(10- 50myr),主序星与母星系中心的投影在7到13度之间。我们将恒星的速度与圆盘模型的速度进行了比较,发现我们的恒星与圆盘模型的预测有低到中等的速度差异,这表明它们是在原地形成的。我们的研究表明,最近的恒星形成发生在LMC的远边缘,到目前为止,那里只知道古老的物体。这些新形成的恒星的空间结构呈环状,半径为12kpc,距离LMC中心的位移为2.6 kpc。这个结构,如果是真的,将暗示一个由小麦哲伦星云和大星云盘之间的偏离中心碰撞引发的恒星形成事件。
Despite their close proximity, the complex interplay between the two Magellanic Clouds, the Milky Way, and the resulting tidal features, is still poorly understood. Recent studies have shown that the Large Magellanic Cloud (LMC) has a very extended disk strikingly perturbed in its outskirts. We search for recent star formation in the far outskirts of the LMC, out to ~30 degrees from its center. We have collected intermediate-resolution spectra of thirty-one young star candidates in the periphery of the LMC and measured their radial velocity, stellar parameters, distance and age. Our measurements confirm membership to the LMC of six targets, for which the radial velocity and distance values match well those of the Cloud. These objects are all young (10-50 Myr), main-sequence stars projected between 7 and 13 degrees from the center of the parent galaxy. We compare the velocities of our stars with those of a disk model, and find that our stars have low to moderate velocity differences with the disk model predictions, indicating that they were formed in situ. Our study demonstrates that recent star formation occurred in the far periphery of the LMC, where thus far only old objects were known. The spatial configuration of these newly-formed stars appears ring-like with a radius of 12 kpc, and a displacement of 2.6 kpc from the LMC's center. This structure, if real, would be suggestive of a star-formation episode triggered by an off-center collision between the Small Magellanic Cloud and the LMC's disk.
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发表时间: 1992-07
期刊: --
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