A multivariate approach to decode star formation histories from galaxy spectra.

从星系光谱中解码恒星形成历史的多元方法。

• 批准号: 1912458
• 金额: --
• 依托单位: University College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1912458
• 关键词: multivariate; approach; decode; star; formation

One of the key aspects of extragalactic astrophysics involves the determination of the past star formation history of galaxies. Thisallows us to backtrack the formation process, to understand how galaxies form in relation to intrinsic properties -- such as mass orsize -- or to the environment where they live. This PhD project focuses on improving over traditional techniques aimed at extractingabsorption line indicators from galaxy spectra, which are dependent on the age and metallicity distribution of the underlying, unresolvedstellar populations. The methodology involves new multi-variate techniques that optimally extract information from a large volume ofdata (typically from thousands of galaxy spectra). This timely extension beyond standard measurements of stellar populations willemphasize on the NUV spectral range, which -- in combination with optical information -- will enable us to disentangle the contributionsfrom different stages of the star formation history. The NUV is especially important as very distant, high redshift galaxies, can onlybe observed in detail in their spectral NUV rest frame.

河外天体物理学的一个重要方面是确定星系过去的星星形成历史。这使我们能够回溯星系的形成过程，了解星系是如何形成的，与其内在属性（如质量或大小）或它们所处的环境有关。这个博士项目的重点是改进传统的技术，旨在从星系光谱中提取吸收线指标，这取决于底层未解析恒星种群的年龄和金属丰度分布。该方法涉及新的多变量技术，从大量数据（通常来自数千个星系光谱）中最佳地提取信息。这一及时的扩展超出了对恒星种群的标准测量，将强调NUV光谱范围，结合光学信息，将使我们能够理清星星形成历史不同阶段的贡献。NUV是特别重要的，因为非常遥远，高红移星系，只能在他们的光谱NUV静止框架中详细观察。

项目成果

Exploring a new definition of the green valley and its implications

• DOI: 10.1093/mnrasl/slz106
• 发表时间: 2019-07
• 期刊: Monthly Notices of the Royal Astronomical Society: Letters
• 作者: J. Angthopo;I. Ferreras;J. Silk