Work

Galaxy sizes in the early Universe

Year: 2026

Type: preprint

Abstract: We present preliminary results of a study of galaxy sizes at redshift $z \gtrsim 5$ using the high-resolution, zoom-in \textsc{FirstLight} simulations. We obtain a redshift-independent, chevron-shaped stellar mass--size relation with a peak at $M^{\star} \approx 10^{8.5}~\mathrm{M}_\odot$. 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.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2609.23911

Authors: Cataldi, P., Pedrosa, S., Pellizza, L. J., Ceverino, D., Bignone, L. A.

Institutions: Institute of Astronomy and Space Physics, Universidad Autónoma de Madrid

Language: English

Topic: Galaxies: Formation, Evolution, Phenomena

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Ministerio de Ciencia, Innovación y Universidades, European Commission, Barcelona Supercomputing Center, Gauss Centre for Supercomputing, Leibniz-Gemeinschaft, Agencia Nacional de Promoción Científica y Tecnológica, Agencia Estatal de Investigación

Awards: G1105844351, G1118467792, G2022099432, G2447484062, G491712853, G5195188938, G5635532810, G593054264, Latin American Chinese European Galaxy Formation Network, G6705177600, G7395345766, G7753452159, G7805626310, G7863371703, G8497050386, G8667377315

OpenAlex ID: W7214056968

Cites: 1

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