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Formation of compact galaxies in the Extreme-Horizon simulation
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abstract
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.
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Cited by 1 Pith paper
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Cosmic reflections I: the structural diversity of simulated and observed low-mass galaxy analogues
Both NewHorizon and Illustris TNG50 fail to reproduce the structural diversity of observed low-mass galaxies, falling at opposite extremes of the observed trends.
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