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PreprintCC BY 4.0arXiv

Galaxy sizes in the early Universe

  • P. Cataldi
  • S. Pedrosa
  • L. J. Pellizza
  • D. Ceverino
  • L. A. Bignone
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Abstract

We present preliminary results of a study of galaxy sizes at redshift z ≳ 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⋆ ≈ 108.5 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.

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Cite

BibTeXRIS
BibTeX
@misc{cataldi2026galaxy,
  title = {{Galaxy sizes in the early Universe}},
  author = {P. Cataldi and S. Pedrosa and L. J. Pellizza and D. Ceverino and L. A. Bignone},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.23911},
  eprint = {2609.23911},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.23911},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Galaxy sizes in the early Universe
AU  - P. Cataldi
AU  - S. Pedrosa
AU  - L. J. Pellizza
AU  - D. Ceverino
AU  - L. A. Bignone
PY  - 2026
DA  - 2026/09/20
PB  - arXiv
DO  - 10.48550/arxiv.2609.23911
UR  - https://arxiv.org/abs/2609.23911
AB  - We present preliminary results of a study of galaxy sizes at redshift z ≳ 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^⋆ ≈ 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.
ER  -