基于DESI巡天数据的星系棒结构研究

星系棒结构不仅是表征星系形态的重要指针，还是驱动星系演化的关键因素。尽管近年来人们对星系棒的研究有了很大的进展，但由于相关物理过程的复杂性,现有的统计结果之间仍存在诸多差异，棒在星系演化中的作用及其自身的形成演化过程也不明确。本项目拟基于最新一代星系大天区深度光谱巡天DESI，结合其高质量的深场测光巡天数据（DECaLS、BASS、MzLS）对星系棒进行深入的研究。我们将（1）构建完备的星系大样本，并同时兼顾星系形态尤其是棒的形态参数的精确测量，对星系棒进行定性和定量的识别，完善棒的分析方法；（2）研究棒对星系中的恒星形成以及核活动性的影响，以此了解棒在星系演化中所发挥的作用；（3）分析棒与星系环境和星系性质的相关关系，探讨棒的形成演化过程，验证和完善现有的理论模型。预期结果将加深我们对星系演化的理解，为完善星系形成和演化理论提供观测依据。

Stellar bars are believed to be the key internal drivers of galaxy evolution, and can provide important insights into galactic evolution. Despite of significant progress in recent studies about galactic bars, there are still large discrepancies in some basic statistical results, and the impact of bars on galaxy evolution is still poorly understood due to the complex physical mechanisms. DESI is one of the next-generation large-area deep galaxy surveys in the world, and DECaLS, BASS, MzLS are three deep optical photometric surveys of the DESI Legacy Imaging Surveys. Based on the data of DESI and related surveys, we propose to carry out a series of in-depth studies in the area of stellar bars. We will (1) build samples with high completeness, derive the morphological parameters of galaxies, especially the bars; (2) explore the impact of stellar bars on star formation and AGNs in galaxies to understand the impact of bars on galaxy evolution; (3) analyze the relationship between bars and their host galaxies to derive the process of bar formation and evolution. These research results will help us to achieve a better understanding about the formation and evolution of galaxies, and provide observational constraints on establishing the comprehensive framework of galaxy formation and evolution.