Galaxy sizes in the early Universe
astro-ph.GA
Submitted: 2026-09-20
Updated: 2026-09-20
Comments: 4 Pages, 2 figures
License: http://creativecommons.org/licenses/by/4.0/
The gist: We present preliminary results of a study of galaxy sizes at redshift z 5 using the high-resolution, zoom-in FirstLight simulations.
Terminology
Abstract
We present preliminary results of a study of galaxy sizes at redshift z 5 using the high-resolution, zoom-in FirstLight simulations. We obtain a redshift-independent, chevron-shaped stellar mass--size relation with a peak at M about 10 8.5 M. This relation is shaped by the individual evolution of galaxies, which undergo a phase of contraction at this mass scale triggered by a strong central starburst.
Sources
- Galaxy sizes and compactness at Cosmic Dawn
- The THESAN project: galaxy sizes during the epoch of reionization
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