Formation of compact galaxies in the Extreme-Horizon simulation

S. Chabanier, F. Bournaud, Y. Dubois, S. Codis, D. Chapon, D. Elbaz, C. Pichon, O. Bressand, J. Devriendt, R. Gavazzi, K. Kraljic, T. Kimm, C. Laigle, J. B. Lekien, G. Martin, N. Palanque-Delabrouille, S. Peirani, P. F. Piserchia, A. Slyz, M. TrebitschC. Yèche

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


We present the Extreme-Horizon (EH) cosmological simulation, which models galaxy formation with stellar and active galactic nuclei (AGN) feedback and uses a very high resolution in the intergalactic and circumgalactic medium. Its high resolution in low-density regions results in smaller-size massive galaxies at a redshift of z = 2, which is in better agreement with observations compared to other simulations. We achieve this result thanks to the improved modeling of cold gas flows accreting onto galaxies. In addition, the EH simulation forms a population of particularly compact galaxies with stellar masses of 1010-11 M that are reminiscent of observed ultracompact galaxies at z 2. These objects form primarily through repeated major mergers of low-mass progenitors and independently of baryonic feedback mechanisms. This formation process can be missed in simulations with insufficient resolution in low-density intergalactic regions.

Original languageEnglish
Article numberL8
JournalAstronomy and Astrophysics
Publication statusPublished - 2020 Nov 1

Bibliographical note

Publisher Copyright:
© S. Chabanier et al. 2020.

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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