CROCODILE-DWARF: Assembly and Kinematics of Field Dwarf Galaxies with GADGET4-OSAKA
Kazuki Tomaru, Yuri Oku, Daisuke Toyouchi, Kentaro Nagamine

TL;DR
This study uses advanced hydrodynamic simulations to explore how the assembly history of dwarf galaxies influences their structure and kinematics, revealing that merger activity and formation timescales are key factors.
Contribution
It introduces the CROCODILE-DWARF simulation suite with detailed physics, showing that assembly history, not just halo mass, determines dwarf galaxy diversity.
Findings
Simulations reproduce observed dwarf galaxy relations.
Assembly history correlates with kinematic diversity.
Late mergers can form extended gas disks.
Abstract
We present results from CROCODILE-DWARF, a new suite of cosmological zoom-in hydrodynamic simulations of isolated field dwarf galaxies with halo masses of at , performed with the GADGET4-Osaka code. The simulations include detailed modeling of star formation, chemical enrichment, and supernova feedback using the CELib and Grackle libraries, achieving baryonic resolutions of . Our study focuses on how assembly history governs the structural and kinematic diversity of dwarf galaxies within the CDM framework. The simulated galaxies reproduce the observed stellar-to-halo mass, mass--metallicity, and size--mass relations for nearby dwarf galaxies, including those of the Local Group, yielding stellar masses of . The galaxies display a broad range of rotational support, where gas is generally more rotationally…
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