Exploring the Impacts of Gas Accretion and Environment via Multivariate (Spatial) Analysis of Metals, Star formation, and Morphology of Nearby Subaru HSC Galaxies

我们的结果将于2023年发表在多篇论文中。我们研究了可观测星系属性之间的多维关联，以测试我们对气体吸积和环境效应的理解。我在SDSS+HSC巡天中测量了约40，000个恒星形成星系（SFG）的不对称性和其他参数。Yesuf等人（2023 a）将介绍这些测量结果以及金属丰度和星星形成率（SFR）的不对称趋势。我们还测量了模拟星系在辉煌TNG 50的不对称性。我们证实，TNG 50广泛再现了观察中观察到的SFR的不对称趋势（Bottrell等人，2023）。我们还发现宽线活动星系核（AGN）具有与SFG相似的不对称性和集中度（Yesuf et al. 2023 b; Tang et al. 2023）。这些修改包括更好的图像分割和去混合，使用光度红移来掩盖污染物，以及夹杂物测量误差。我还计算了SDSS和GAMA调查的环境指标，并将这些测量结果用于研究HSC星系。我们与博士生Kiyoaki Omari一起研究了模拟和HSC观测中星系合并与环境之间的关系。我们发现，合并优先在低密度环境中发现（Omari et al. 2023）。我们和另一个学生许海一起研究活动星系核的环境。我们的研究结果表明活动星系核与SFG生活在类似的环境中（Xu et al. 2013; Yesuf 2023 c）。

Our results will be published in several papers in 2023. We study the multi-dimensional association among observable galaxy properties to test our understanding of gas accretion and environmental effects. I measured asymmetry and other parameters for ~40,000 star-forming galaxies (SFGs) in SDSS+HSC surveys. These measurements and the trends of asymmetry with metallicity and star formation rate (SFR) will be presented in Yesuf et al. 2023a. We also measured asymmetry for simulated galaxies in Illustrious TNG50. We confirmed that TNG50 broadly reproduces trends of asymmetry with SFR seen in observations (Bottrell et al. 2023). We also find that broad-line active galactic nuclei (AGNs) have similar asymmetry and concentration as SFGs (Yesuf et al. 2023b; Tang et al. 2023).To compute asymmetry and other parameters, I modified the statmorph code. The modifications include better image segmentation and deblending, use of photometric redshifts to mask contaminants, and inclusion measurement errors. I also computed environmental indicators for SDSS and GAMA surveys and these measurements are used to study HSC galaxies.With a PhD student, Kiyoaki Omari, we investigated the relationship between galaxy mergers and environments in both simulations and HSC observations. We found that mergers are preferentially found in low-density environments (Omari et al. 2023). With another student, Hai Xu, we study environments of AGNs. Our results indicate that AGNs live in similar environments as SFGs (Xu et al. 2013; Yesuf 2023c).I have presented our results in several universities.