8 papers
How Do Disk Galaxies Form?
Vadim A. Semenov
In both observed and simulated galaxies, disk morphologies become more prevalent at higher masses and lower redshifts. To elucidate the physical origin of this trend, we develop a…
Capturing Turbulence with Numerical Dissipation: a Simple Dynamical Model for Unresolved Turbulence in Hydrodynamic Simulations
Vadim A. Semenov
Modeling unresolved turbulence in astrophysical gasdynamic simulations can improve the modeling of other subgrid processes dependent on the turbulent structure of gas: from flame p…
What Sets the Metallicity of Ultra-Faint Dwarfs?
Vance Wheeler, Andrey Kravtsov, Anirudh Chiti +2
We use intergalactic medium (IGM) metallicity distributions from several state-of-the-art cosmological simulations of Milky Way analogs and a semi-analytic model of ultra-faint dwa…
From UV-bright Galaxies to Early Disks: the Importance of Turbulent Star Formation in the Early Universe
Vadim A. Semenov, Charlie Conroy, Lars Hernquist
Bursty star formation at early times can explain the surprising abundance of early UV-bright galaxies revealed by JWST but can also be a reason for the delayed formation of galacti…
How Early Could the Milky Way's Disk Form?
Vadim A. Semenov, Charlie Conroy, Aaron Smith +2
We investigate early, , galaxy formation in a cosmological zoom-in simulation of a close, early-forming Milky Way (MW) analog extracted from TNG50 simulation and resimulated…
Rising from the Ashes II: The Bar-driven Abundance Bimodality of the Milky Way
Angus Beane, James Johnson, Vadim Semenov +3
The Milky Way hosts at least two modes in its present day distribution of Fe and alpha-elements. The exact cause of this bimodality is disputed, but one class of explanations invol…