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

通过对附近 Subaru HSC 星系的金属、恒星形成和形态进行多元（空间）分析，探索气体吸积和环境的影响

基本信息

批准号：
22K14072
负责人：
Yesuf Hassen
金额：
$ 1.75万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Early-Career Scientists
财政年份：
2022
资助国家：
日本
起止时间：
2022-04-01 至 2023-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-22K14072/
关键词：
Structure morphology bulge metallicity interstellar medium gas accretion environment Subaru HSC galaxy structure galaxy environment metals

项目摘要

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.

我们的研究结果将于 2023 年发表在多篇论文中。我们研究可观测星系特性之间的多维关联，以测试我们对气体吸积和环境影响的理解。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 等人将介绍这些测量结果以及金属丰度和恒星形成率 (SFR) 的不对称趋势。 2023a。我们还测量了 Illustrious TNG50 中模拟星系的不对称性。我们证实，TNG50 广泛再现了观测中所见的 SFR 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 类似的不对称性和浓度（Yesuf 等人，2023b；Tang 等人，2023）。为了计算不对称性和其他参数，我修改了 statmorph 代码。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 巡天的环境指标，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。我们发现合并优先发生在低密度环境中（Omari et al. 2023）。我们和另一位学生徐海一起研究活动星系核的环境。我们的结果表明 AGN 生活在与 SFG 相似的环境中（Xu 等人，2013；Yesuf 2023c）。我已经在几所大学展示了我们的结果。