Browsing University of Hertfordshire by Author "Devriendt, J. E. G."

Now showing items 1-10 of 10

    • 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. ...

    • 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 ...

    • 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 ...

    • 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). ...

    • 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 ...