Peeping into recent star-formation history of Magellanic Clouds

IF 1.1 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Journal of Astrophysics and Astronomy Pub Date : 2023-05-13 DOI:10.1007/s12036-023-09938-8

Y. C. Joshi, A. Panchal

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Abstract

We study the distribution of fundamental-mode Cepheids in the Magellanic Clouds as a function of their positions and ages using the data from the OGLE IV survey. The ages 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 Clouds. The age distributions of the Cepheids in LMC and SMC show prominent peaks around \(158^{+46}_{-35}\) Myr and \(219^{+63}_{-49}\) Myr, respectively. This indicates that a major star-formation event took place in the Magellanic Clouds about 200 Myr ago. It is believed that this episode of enhanced star formation might have been triggered by a close encounter between the two components of the Magellanic Clouds or due to a possible tidal interaction between the Magellanic Clouds and Milky Way galaxy during one of its pericentric passages around the Milky Way. Cepheids are found to be asymmetrically distributed in both the LMC and SMC in an elongated manner. A high spatial density clumpy structure is found to be located towards the eastern side of the LMC and the south-west direction of the SMC from their respective galactic centers.

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窥视麦哲伦星云最近的恒星形成历史

我们利用OGLE IV调查的数据研究了麦哲伦星云中基模造父变星的分布，作为它们位置和年龄的函数。造父变星的年龄是通过众所周知的LMC和SMC造父变星的周期-年龄关系来确定的，这被用来理解麦哲伦星云中恒星形成的场景。造父变星在LMC和SMC的年龄分布分别在\(158^{+46}_{-35}\) Myr和\(219^{+63}_{-49}\) Myr附近有显著的峰值。这表明大约200万年前，麦哲伦星云中发生了一次主要的恒星形成事件。据信，这一增强恒星形成的插曲可能是由麦哲伦星云的两个组成部分之间的近距离接触引发的，或者是由于麦哲伦星云和银河系在绕银河系的一个中心通道期间可能发生的潮汐相互作用。造父变星在大麦哲伦和中麦哲伦都呈细长状不对称分布。高空间密度的团块结构位于大麦哲伦星系的东侧和小麦哲伦星系的西南方向。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Astrophysics and Astronomy 地学天文-天文与天体物理

CiteScore

1.80

自引率

9.10%

发文量

审稿时长

>12 weeks

期刊介绍： The journal publishes original research papers on all aspects of astrophysics and astronomy, including instrumentation, laboratory astrophysics, and cosmology. Critical reviews of topical fields are also published. Articles submitted as letters will be considered.