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Dark-matter-deficient dwarf galaxies form via tidal stripping of dark matter in interactions with massive companions
(2021-01-15)
In the standard Lambda-CDM paradigm, dwarf galaxies are expected to be dark-matter-rich, as baryonic feedback is thought to quickly drive gas out of their shallow potential wells and quench star formation at early epochs. ...
The origin of low-surface-brightness galaxies in the dwarf regime
(2021-01-13)
Low-surface-brightness galaxies (LSBGs) -- defined as systems that are fainter than the surface-brightness limits of past wide-area surveys -- form the overwhelming majority of galaxies in the dwarf regime (M* < 10^9 MSun). ...
The role of mergers and interactions in driving the evolution of dwarf galaxies over cosmic time
(2020-11-07)
Dwarf galaxies (M⋆ < 109 M☉) are key drivers of mass assembly in high-mass galaxies, but relatively little is understood about the assembly of dwarf galaxies themselves. Using the NEWHORIZON cosmological simulation (∼40 ...
Density profile of dark matter haloes and galaxies in the Horizon-AGN simulation : the impact of AGN feedback
(2017-12-01)
Using a suite of three large cosmological hydrodynamical simulations, Horizon-AGN, Horizon-noAGN (no AGN feedback) and Horizon-DM (no baryons), we investigate how a typical sub-grid model for AGN feedback affects the ...
Cosmic evolution of stellar quenching by AGN feedback : clues from the Horizon-AGN simulation
(2017-11-21)
The observed massive end of the galaxy stellar mass function is steeper than its predicted dark matter halo counterpart in the standard $\Lambda $CDM paradigm. In this paper, we investigate the impact of active galactic ...
Galaxy merger histories and the role of merging in driving star formation at z>1
(2015-09-21)
We use Horizon-AGN, a hydrodynamical cosmological simulation, to explore the role of mergers in the evolution of massive (M > 10^10 MSun) galaxies around the epoch of peak cosmic star formation (1zR(4:1 3 are 'blue' (i.e. ...