Research Interest

Localized Deviations from the CO–PAH Relation in PHANGS–JWST Galaxies: Elevated CO Emissivity or Faint PAHs?

We report a breakdown of the CO-PAH relation in PHANGS galaxies. In 14 out of 70 PHANGS-JWST galaxies, localized central/bar regions show more than an order of magnitude higher CO flux excess over PAH flux, with elevated CO velocity dispersion, favoring large-scale dynamics enhancing CO intensity over PAH suppression.

Related paper: to be submitted in Oct 2025 draft

Timescales of PAH and Dust Continuum Emission from Gas Clouds Compared to Molecular Gas Cloud Lifetimes in PHANGS-JWST Galaxies

JWST Mid-IR (7.7–11.3micron) cloud emission lasts 10–30Myr, closely matching CO-based GMC lifetimes, suggesting a rapid conversion from atomic to CO-bright molecular gas phase.

JWST reveals the duration of early phases of star formation in NGC628

Half of the star formation duration, detected in mid-IR, is missed when using Halpha only.

Related paper: Kim et al. 2021 Kim et al. 2023

Molecular clouds lifecycle in 54 main-sequence galaxies

I have quantified links between the small-scale GMC evolution and the galactic-scale environmental properties using 54 main-sequence PHANGS galaxies.

Origin of the observed Na-O anti-correlations in globular clusters

I developed chemical evolution models for globular clusters that reproduced Na-O anti-correlation, along with other observed properties (e.g. CMD, population ratio), as well as observed Na abundance spreads in the MW bulge.

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