Formation of compact galaxies in the Extreme-Horizon simulation

We present the Extreme-Horizon (EH) cosmological simulation: EH models galaxy formation with stellar and AGN feedback and uses a very high resolution in the intergalactic and circumgalactic medium. The high resolution in low-density regions results in smaller-size massive galaxies at redshift \(z=2\...

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Published in:arXiv.org 2020-07
Main Authors: Chabanier, Solène, Bournaud, Frédéric, Dubois, Yohan, Codis, Sandrine, Chapon, Damien, Elbaz, David, Pichon, Christophe, Bressand, Olivier, Devriendt, Julien, Gavazzi, Raphael, Kraljic, Katarina, Kimm, Taysun, Laigle, Clotilde, Lekien, Jean-Baptiste, Martin, Garreth, Palanque-Delabrouille, Nathalie, Peirani, Sébastien, Pierre-Franck Piserchia, Slyz, Adrianne, Trebitsch, Maxime, Yèche, Christophe
Format: Article
Language:English
Subjects:
Active galactic nuclei
Astronomical models
Cold flow
Cold gas
Compact galaxies
Computer simulation
Density
Deposition
Feedback
Galactic evolution
Gas flow
High resolution
Red shift
Simulation
Star & galaxy formation
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Summary:We present the Extreme-Horizon (EH) cosmological simulation: EH models galaxy formation with stellar and AGN feedback and uses a very high resolution in the intergalactic and circumgalactic medium. The high resolution in low-density regions results in smaller-size massive galaxies at redshift \(z=2\), in better agreement with observations compared to other simulations. This results from the improved modeling of cold gas flows accreting onto galaxies. Besides, the EH simulation forms a population of particularly compact galaxies with stellar masses of \(10^{10-11}\)\,M\(_\sun\) that are reminiscent of observed ultracompact galaxies at \(z\simeq2\). These objects form mainly through repeated major mergers of low-mass progenitors, independently of baryonic feedback mechanisms. This formation process can be missed in simulations using a too low resolution in low-density intergalactic regions.
ISSN:2331-8422
DOI:10.48550/arxiv.2007.04624