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

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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.