Speaker
Description
Morphology is one of the fundamental characteristics of galaxies, yet reproducing it has long been a challenge for semi-analytic models. These models typically overpredict bulge-dominated massive galaxies and disk-dominated low-mass galaxies. I will introduce how we improve the model performance by modifying the bulge formation through galaxy mergers.
The improved approach takes use of the scaling relation summarised from the hydrodynamical simulation TNG, which correlates bulge-to-total ratio (B/T) with orbital angle, primary galaxy stellar mass, and other properties. The updated model shows good agreement with the B/T distribution observed in SDSS. This method helps to confirm key factors driving bulge formation and can be easily applied to other models.
