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Ziyi Guo

Observations

We observe galaxies and molecular gas across cosmic time.

ALMA JWST Local Universe High-z Galaxies
ALMA telescope array

Ziyi Guo

Galactic Chemical Evolution
I connect ALMA and JWST observations with chemical evolution models to understand how galaxies form stars, enrich their gas, and build the elements over cosmic time.
Research Publications CV

Theory

We build models that translate chemical fingerprints into galaxy histories.

Sodium abundance model figure
Star
Formation
Stellar
Yields
Chemical
Enrichment
Outflow
Research Highlights
CO isotopologue spectrum

CO isotopologues as IMF tracers

Using ¹³CO/C¹⁸O ratios from ALMA to probe IMF variations in high-redshift main-sequence and starburst galaxies.

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Galactic chemical evolution model figure

Physically motivated GCE models

Connecting stellar yields, star formation histories, gas inflow and outflow, and abundance patterns in galaxies.

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ALMA telescope array

From local galaxies to cosmic dawn

Combining ALMA and JWST measurements to interpret early star formation, metallicity, and chemical enrichment.

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Research Themes
Radio antenna

1. Observations

ALMA and JWST measurements of molecular lines, isotopes, and chemical abundances in galaxies.

CO isotopologue spectrum

2. Chemical Fingerprints

Isotopes and elements trace stellar populations, gas conditions, and recent star formation histories.

Galactic chemical evolution model

3. GCE Modeling

Models connect stellar yields, SFH, inflow, outflow, and abundance evolution across galaxy types.

IMF and stellar yields

4. IMF & Stellar Yields

Constraining the IMF and nucleosynthesis from massive, binary, AGB, and low-metallicity stars.

Galaxy evolution

5. Galaxy Evolution

Understanding how galaxies assemble their mass, metals, and stellar populations over cosmic time.

“The elements we observe today are the memory of galaxies.
My goal is to read that memory.”