论文标题
窥视麦哲伦云的近期恒星形成历史
Peeping into recent star formation history of the Magellanic Clouds
论文作者
论文摘要
在这里，我们使用Ogle〜IV调查中的数据研究了麦哲伦云中基本模式头孢菌素的分布，这是其位置和年龄的函数。头孢菌的年龄是通过众所周知的LMC和SMC头孢菌素的年龄关系来确定的，这些时代关系用于了解麦哲伦云中的恒星形成场景。 LMC和SMC中头孢菌素的年龄分布在$ 155^{+45} _ { - 35} $ MYR和$ 224^{+51} _ { - 42} $ MYR。这表明大约200 \ Myr以前的麦哲伦云中发生了一个主要的明星阵型事件。人们认为，这一事件可能是由于麦哲伦云的两个组成部分之间的紧密相遇而引起的，或者是由于在银河系周围的一个中心通道中，麦哲伦云与银河系之间可能存在潮汐相互作用。发现头孢菌素在LMC和SMC中均不对称分布。发现一个高密度的块状结构位于LMC的东侧和SMC的西南方向，从其各自的银河中心。
Here, we study the distribution of Fundamental-mode Cepheids in the Magellanic Cloud as a function of their positions and ages using the data from the OGLE~IV survey. Age of the Cepheids are determined through well known period - age relations for the LMC and SMC Cepheids which are used to understand the star formation scenario in the Magellanic Cloud. The age distributions of the Cepheids in LMC and SMC show peak around $155^{+45}_{-35}$ Myr and $224^{+51}_{-42}$ Myr, respectively. This indicates that a major star formation event took place in the Magellanic Cloud at about 200\,Myr ago. It is believed that this event might have been triggered by a close encounter between the two components of the Magellanic Cloud or due to a possible tidal interaction between the Magellanic Cloud and Milky Way galaxy during one of its pericentric passages round the Milky Way. Cepheids are found to be asymmetrically distributed in both the LMC and SMC. A high-density clumpy structure is found to be located towards eastern side of the LMC and south-west direction of the SMC from their respective galactic centres.
