University of Toronto · Astronomy & Astrophysics

Chasing the first light of the Universe.

Seiji Fujimoto, Assistant Professor, David A. Dunlap Department of Astronomy & Astrophysics

Venturing into unknown horizons and sharing the wonder of discovery is at the heart of my work as an observational astronomer. We study the earliest galaxies, black holes, and stars with JWST, ALMA, and observatories around the world.

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Research

Four windows on cosmic dawn

Multi-wavelength observations across the first billion years, from individual lensed stars to the assembly of entire galaxies.

Galaxies

How the first galaxies formed and grew at z > 6, traced with JWST spectroscopy and ALMA [CII] + dust imaging.

Stars & clusters

Gravitational lensing resolves early galaxies to parsec scales, down to proto-globular clusters and individual stars.

Black holes

The first quasars and the puzzling "Little Red Dots": how supermassive black holes grew so quickly in the early universe.

Supernovae

Lensing clusters as time-domain telescopes: magnified supernovae at z > 2 probing the first stellar explosions.

From the group

Recent first-author and student-led papers from the group.

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Flagship programs

Programs we lead

Large observing programs designed and led from Toronto, plus 15+ major collaborations with JWST, ALMA, and Subaru.

JWST Treasury · PI

VENUS

The second-largest JWST program: a multi-epoch survey of 60 massive galaxy clusters, capturing the faintest galaxies, black holes, and supernovae at z ~ 4–20.

JWST · ALMA · MUSE PI

People

The group

Postdocs, grad students, and undergrads working on JWST and ALMA data at the frontier of the observable Universe. We recruit PhD students every year and welcome postdoc fellowship applicants.