Merger histories of galaxies in the GECKOS survey

GECKOS 巡天中的星系合并历史

• 批准号: 2822929
• 金额: --
• 依托单位: Liverpool John Moores University
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2822929
• 关键词: Merger; histories; galaxies; GECKOS; survey

This project will examine the connection between a galaxy's merger history and the structure of its disc, and will take advantage of GECKOS, a new VLT/MUSE survey of 35 nearby edge-on galaxies.To recover merger histories, a range of techniques exist (see for instance Martig et al 2021, Boecker et al 2020, Zhu et al 2022). The technique presented in Martig et al (2021) is based on the idea that for a given age, accreted stars are more metal-poor than those formed in situ. This technique needs to be tested and refined, and it will be the first step of the project: to use simulations to assess how well we can recover past merger events based on the age-metallicity relation: which mergers can be identified that way? How much can we trust mass ratio and merger time derived? We will use the ARTEMIS simulations for this project, and will create mock GECKOS-like observations to test the method.The second step will be to use what we have learnt, and characterize the merger histories of all GECKOS galaxies (we will also produce maps of where accreted stars currently lie).The final step will be to gather all the results obtained within the course of the survey on the structure of discs (mass in thin and thick discs, age-velocity relation, scale-heights of mono-age populations, flaring in the outer disc, radial age gradients). Can we link merger events with particular signatures such as jumps in velocity dispersion at a given age, or increased scale-height? Which mergers produce massive thick discs? Do we confirm results from Garcia de la Cruz et al (2021) on the influence of mergers on flaring and age gradients? Are there thick discs that seem to have formed in the absence of mergers?

该项目将检查银河系的合并历史与碟片的结构之间的联系，并将利用壁虎，这是一项新的VLT/MUSE调查，对35个附近的边缘星系附近的调查。要恢复合并历史记录，存在一系列技术（请参阅Martig et al 2021，Boecker等，Boecker et al 2020，Zhu et al 20222）。 Martig等人（2021）中提出的技术是基于这样的想法：对于给定的年龄，积聚的恒星比原位形成的恒星更贫穷。该技术需要进行测试和完善，这将是项目的第一步：使用模拟来评估我们如何根据年龄之间的关系恢复过去的合并事件：可以以这种方式确定哪些合并？我们可以信任质量比和合并时间多少？ We will use the ARTEMIS simulations for this project, and will create mock GECKOS-like observations to test the method.The second step will be to use what we have learnt, and characterize the merger histories of all GECKOS galaxies (we will also produce maps of where accreted stars currently lie).The final step will be to gather all the results obtained within the course of the survey on the structure of discs (mass in thin and thick discs, age-velocity relation,一型人群的比例高度，外盘呈耀斑，径向年龄梯度）。我们可以将合并事件与特定的特定签名联系起来，例如在给定年龄段的速度分散或增加规模高度的签名？哪些合并会产生巨大的厚度圆盘？我们是否证实了Garcia de La Cruz等人（2021）对合并对燃烧和年龄梯度的影响的结果？在没有合并的情况下，是否存在似乎形成的厚光盘？