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Browsing by Author "Dubois, Y."
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Constraining stellar assembly and active galactic nucleus feedback at the peak epoch of star formation
Kimm, T.; Kaviraj, S.; Devriendt, J.E.G.; Dubois, Y.; Slyz, A.; Cohen, S.H.; Windhorst, R.A.; Silk, J.; Hathi, N.P.; Ryan, R.E.; O'Connell, R.W.; Dopita, M.A. (2012-09-01)We study stellar assembly and feedback from active galactic nuclei (AGN) around the epoch of peak star formation (1 ≲ z ≲ 2), by comparing hydrodynamic simulations to rest-frame UV-optical galaxy colours from the Wide Field ... -
Cosmic evolution of stellar quenching by AGN feedback : clues from the Horizon-AGN simulation
Beckmann, R. S.; Devriendt, J.E.G.; Slyz, A.; Peirani, S.; Richardson, M. L. A.; Dubois, Y.; Pichon, C.; Chisari, N. E.; Kaviraj, S.; Laigle, C.; Volonteri, M. (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 ... -
Dark-matter-deficient dwarf galaxies form via tidal stripping of dark matter in interactions with massive companions
Jackson, R. A.; Kaviraj, S.; Martin, G.; Devriendt, J. E. G.; Slyz, A.; Silk, J.; Dubois, Y.; Yi, S. K.; Pichon, C.; Volonteri, M.; Choi, H.; Kimm, T.; Kraljic, K.; Peirani, S. (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. ... -
Density profile of dark matter haloes and galaxies in the Horizon-AGN simulation : the impact of AGN feedback
Peirani, S.; Dubois, Y.; Volonteri, M.; Devriendt, J.E.G.; Bundy, K.; Silk, J.; Pichon, C.; Kaviraj, S.; Gavazzi, R.; Habouzit, M. (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 ... -
Extremely massive disc galaxies in the nearby Universe form through gas-rich minor mergers
Jackson, R. A.; Kaviraj, S.; Martin, G.; Devriendt, J. E. G.; Noakes-Kettel, E. A.; Silk, J.; Ogle, P.; Dubois, Y. (2022-01-14)In our hierarchical structure-formation paradigm, the observed morphological evolution of massive galaxies -- from rotationally-supported discs to dispersion-dominated spheroids -- is largely explained via galaxy merging. ... -
The formation and evolution of low-surface-brightness galaxies
Martin, G.; Kaviraj, S.; Laigle, C.; Devriendt, J. E. G.; Jackson, R. A.; Peirani, S.; Dubois, Y.; Pichon, C.; Slyz, A. (2019-05-01)Our statistical understanding of galaxy evolution is fundamentally driven by objects that lie above the surface-brightness limits of current wide-area surveys (μ ∼23 mag arcsec -2). While both theory and small, deep surveys ... -
The formation of cores in galaxies across cosmic time - the existence of cores is not in tension with the ΛCDM paradigm
Jackson, R. A.; Kaviraj, S.; Yi, S. K.; Peirani, S.; Dubois, Y.; Martin, G.; Devriendt, J. E. G.; Slyz, A.; Pichon, C.; Volonteri, M.; Kimm, T.; Kraljic, K. (2024-02-01)The 'core-cusp' problem is considered a key challenge to the ΛCDM paradigm. Haloes in dark matter only simulations exhibit 'cuspy' profiles, where density continuously increases towards the centre. However, the dark matter ... -
Galaxy merger histories and the role of merging in driving star formation at z>1
Kaviraj, S.; Devriendt, J.; Dubois, Y.; Slyz, A.; Welker, C.; Pichon, C.; Peirani, S.; Borgne, D. Le (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. ... -
The Horizon-AGN simulation: evolution of galaxy properties over cosmic time
Kaviraj, S.; Laigle, C.; Kimm, T.; Devriendt, J. E. G.; Dubois, Y.; Pichon, C.; Slyz, A.; Chisari, E.; Peirani, S. (2017-06-01)We compare the predictions of Horizon-AGN, a hydro-dynamical cosmological simulation that uses an adaptive mesh refinement code, to observational data in the redshift range 0 < z < 6. We study the reproduction, by the ... -
Identifying the progenitors of present-day early-type galaxies in observational surveys: correcting `progenitor bias' using the Horizon-AGN simulation
Martin, G.; Kaviraj, S.; Devriendt, J.E.G.; Dubois, Y.; Pichon, C.; Laigle, C. (2018-03-01)As endpoints of the hierarchical mass-assembly process, the stellar populations of local earlytype galaxies encode the assembly history of galaxies over cosmic time. We useHorizon-AGN, a cosmological hydrodynamical simulation, ... -
Jet interactions with a giant molecular cloud in the Galactic centre and ejection of hypervelocity stars
Silk, J.; Antonuccio-Delogu, V.; Dubois, Y.; Gaibler, V.; Haas, M.~R.; Khochfar, S.; Krause, Martin (2012-09-21)The hypervelocity OB stars in the Milky Way Galaxy were ejected from the central regions some 10-100 million years ago. We argue that these stars, as well as many more abundant bound OB stars in the innermost few parsecs, ... -
The limited role of galaxy mergers in driving stellar mass growth over cosmic time
Martin, G.; Kaviraj, S.; Devriendt, J.E.G.; Dubois, Y.; Laigle, C.; Pichon, C. (2017-11-21)A key unresolved question is the role that galaxy mergers play in driving stellar mass growth over cosmic time. Recent observational work hints at the possibility that the overall contribution of `major' mergers (mass ... -
Massive spheroids can form in single minor mergers
Jackson, R. A.; Martin, G.; Kaviraj, S.; Laigle, C.; Devriendt, J. E. G.; Dubois, Y.; Pichon, C. (2019-11-01)Understanding how rotationally supported discs transform into dispersion-dominated spheroids is central to our comprehension of galaxy evolution. Morphological transformation is largely merger-driven. While major mergers ... -
Normal black holes in bulge-less galaxies: the largely quiescent, merger-free growth of black holes over cosmic time
Martin, G.; Kaviraj, S.; Volonteri, M.; Simmons, B. D.; Devriendt, J. E. G.; Lintott, C. J.; Smethurst, R. J.; Dubois, Y.; Pichon, C. (2018-05-11)Understanding the processes that drive the formation of black holes (BHs) is a key topic in observational cosmology. While the observed M BH-M Bulge correlation in bulge-dominated galaxies is thought to be produced by major ... -
The origin of low-surface-brightness galaxies in the dwarf regime
Jackson, R. A.; Martin, G.; Kaviraj, S.; Ramsøy, M.; Devriendt, J. E. G.; Sedgwick, T.; Laigle, C.; Choi, H.; Beckmann, R. S.; Volonteri, M.; Dubois, Y.; Pichon, C.; Yi, S. K.; Slyz, A.; Kraljic, K.; Kimm, T.; Peirani, S.; Baldry, I. (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). ... -
Population statistics of intermediate-mass black holes in dwarf galaxies using the NEWHORIZON simulation
Beckmann, R. S.; Dubois, Y.; Volonteri, M.; Dong-Páez, C. A.; Trebitsch, M.; Devriendt, J.; Kaviraj, S.; Kimm, T.; Peirani, S. (2023-08-01)While it is well established that supermassive black holes (SMBHs) coevolve with their host galaxy, it is currently less clear how lower-mass black holes, so-called intermediate-mass black holes (IMBHs), evolve within their ... -
The role of mergers and interactions in driving the evolution of dwarf galaxies over cosmic time
Martin, G.; Jackson, R. A.; Kaviraj, S.; Choi, H.; Devriendt, J. E. G.; Dubois, Y.; Kimm, T.; Kraljic, K.; Peirani, S.; Pichon, C.; Volonteri, M.; Yi, S. K. (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 ... -
The role of mergers in driving morphological transformation over cosmic time
Martin, G.; Kaviraj, S.; Devriendt, J. E. G.; Dubois, Y.; Pichon, C. (2018-10-01)Understanding the processes that trigger morphological transformation is central to understanding how and why the Universe transitions from being disc-dominated at early epochs to having the morphological mix that is ...