@article{f29eaada-4a4b-43d6-8a89-da80226eee0b,
  abstract     = {{<p>Radial migration and dynamical heating redistribute stars within galactic discs and thereby modify the chemo-kinematic structure of their host galaxies. Usually, these secular processes are studied in N-body and hydrodynamical simulations of Milky Way analogues with stellar-dominated discs. In contrast, discs at high redshift are gas rich, which may qualitatively change how secular evolution proceeds. We use the Nexus framework to construct and evolve a suite of isolated galaxies with fixed halo and disc mass but varying initial disc gas fraction, from 0 to 100 per cent. We show that in gas-rich models, the root-mean-square change in stellar angular momentum is up to a factor of 2 larger than in gas-poor analogues and is accompanied by stronger radial and vertical heating, leading to enhanced radial mixing. We further dissect the role of gas in specific migration channels. For bar-driven migration, corotation-resonance dragging dominates in gas-poor discs, whereas in gas-rich discs stars more readily reach and accumulate at the outer Lindblad resonance, which acts as a barrier. The high radial mixing efficiency in gas-rich phases can flatten the stellar metallicity gradient relative to that of the initial gaseous disc within only a few orbital time-scales. Together, these results imply that radial mixing in early, gas-rich discs is substantially more vigorous than in late-time, gas-poor discs, naturally producing distinct evolutionary tracks for chemically bimodal discs such as that of the Milky Way.</p>}},
  author       = {{Zhang, Han Yuan and Tepper-García, Thor and Belokurov, Vasily and Evans, N. Wyn and Tsukui, Takafumi and Davis, Hillary and Bland-Hawthorn, Joss and Sanders, Jason L. and Agertz, Oscar}},
  issn         = {{0035-8711}},
  keywords     = {{galaxies: evolution; galaxies: kinematics and dynamics; Galaxy: disc; Galaxy: evolution}},
  language     = {{eng}},
  number       = {{4}},
  publisher    = {{Oxford University Press}},
  series       = {{Monthly Notices of the Royal Astronomical Society}},
  title        = {{Enhanced rates of stellar radial migration in gas-rich discs at high redshift}},
  url          = {{http://dx.doi.org/10.1093/mnras/stag1082}},
  doi          = {{10.1093/mnras/stag1082}},
  volume       = {{549}},
  year         = {{2026}},
}