Guillermo Haro Program
26th Edition Guillermo Haro Workshop 2026

Chemical Abundances,
ISM Properties, and
Galaxy Evolution
Across Cosmic Time

An intensive two-week workshop exploring chemical abundances as a fundamental probe of galaxy evolution and the physical processes shaping the interstellar medium, from the local Universe to the earliest cosmic epochs.

Dates July 20 – 31, 2026
Venue INAOE, Tonantzintla, Puebla
Format By invitation only

A forum for in-depth scientific exchange

The study of chemical abundances across cosmic time offers a crucial perspective on the evolution of the universe — from the earliest primordial gas clouds to the diverse present-day populations of stars and galaxies. By examining the composition of gas, stars, and galaxies at multiple scales, we can trace element enrichment, gain insights into the processes driving star formation, and explore the impact of feedback mechanisms in shaping cosmic structures.

The Guillermo Haro Workshops are by-invitation-only meetings, designed to promote in-depth discussion and close interaction among participants. The format combines morning lectures and frontier research talks with afternoon working group sessions and an informal, collaborative atmosphere aimed at identifying open questions and fostering new collaborations.

INAOE is located in Tonantzintla — less than 10 minutes from the ancient Cholula pyramid and 30 minutes from the colonial city of Puebla de los Ángeles, a region also renowned for its outstanding gastronomy.

Two thematic weeks

Week 1 · July 20–24, 2026

Local Universe

Metallicities, chemical abundances, and the ISM in the local Universe — including nearby galaxies, resolved stellar populations, and the physical processes governing metal enrichment and mixing.

Week 2 · July 27–31, 2026

High-Redshift Environments

The evolution of ISM properties at early cosmic times, including dust and gas studies, and observational perspectives spanning submillimeter, optical, and near-infrared wavelengths, with emphasis on ALMA, GTM, GTC, HST, and JWST.

Workshop themes

01Gas-phase metallicity in galaxies and its evolution over cosmic time
02Primordial nucleosynthesis and the first metals in the universe
03Chemical abundances in stars and stellar populations as tracers of galactic history
04The role of feedback, outflows, and mixing in metal enrichment
05The intergalactic medium and large-scale chemical evolution
06Photoionization models, stellar population synthesis, and chemical evolution simulations
07Insights from JWST, ALMA, GTM, GTC, HST and spectroscopic surveys (SDSS, CALIFA, PHANGS, etc.)
08Dust and gas studies at early cosmic epochs