Issue |
A&A
Volume 643, November 2020
|
|
---|---|---|
Article Number | L8 | |
Number of page(s) | 12 | |
Section | Letters to the Editor | |
DOI | https://doi.org/10.1051/0004-6361/202038614 | |
Published online | 04 November 2020 |
Letter to the Editor
Formation of compact galaxies in the Extreme-Horizon simulation
1
IRFU, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
e-mail: chabaniersolene@gmail.com
2
AIM, CEA, CNRS, Université Paris-Saclay, Université Paris Diderot, Sorbonne Paris Cité, 91191 Gif-sur-Yvette, France
3
CNRS and Sorbonne Université, UMR 7095, Institut d’Astrophysique de Paris, 98 bis Boulevard Arago, 75014 Paris, France
4
Université Paris-Saclay, CNRS, CEA, Institut de Physique Théorique, 91191 Gif-sur-Yvette, France
5
Korea Institute of Advanced Studies (KIAS) 85 Hoegiro, Dongdaemun-gu, Seoul 02455, Republic of Korea
6
CEA, DAM, DIF, 91297 Arpajon, France
7
Université Paris-Saclay, CEA, Laboratoire en Informatique Haute Performance pour le Calcul et la simulation, 91680 Bruyères-le-Châtel, France
8
Astrophysics, University of Oxford, Oxford OX1 3RH, UK
9
Institute for Astronomy, Royal Observatory, Edinburgh EH9 3HJ, UK
10
Department of Astronomy, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
11
Steward Observatory, University of Arizona, 933 N. Cherry Ave, Tucson, AZ 85719, USA
12
Korea Astronomy and Space Science Institute, 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Korea
13
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, CS 34229, 06304 Nice Cedex 4, France
14
Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK
15
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
16
Zentrum für Astronomie der Universität Heidelberg, Institut für Theoretische Astrophysik, Albert-Ueberle-Str. 2, 69120 Heidelberg, Germany
Received:
9
June
2020
Accepted:
3
October
2020
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.
Key words: galaxies: formation / galaxies: evolution / galaxies: high-redshift / galaxies: structure / methods: numerical
© S. Chabanier et al. 2020
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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