GEAR model

GEAR’s model are mainly described in Revaz & Jablonka. This model can be selected with the configuration option --with-subgrid=GEAR and run with the option --gear. A few examples exist and can be found in examples/GEAR, examples/SinkParticles or IsolatedGalaxy/IsolatedGalaxy_multi_component.

Table of Contents

• Pressure Floor
• Star formation
  • Initial Conditions
• Cooling: Grackle
  • Configuring and compiling SWIFT with Grackle
  • Parameters
    • Complete parameter list
• Chemistry
  • Smoothed metallicity
• Stellar evolution and feedback
  • Initial mass function
  • Lifetime
  • Supernovae II
  • Supernovae Ia
  • Supernova energy injection
  • Generating a new table
• GEAR supernova feedback
  • GEAR model
• Sink particles and star formation in GEAR model
  • Introduction
  • Compiling and running the model
  • Model summary
    • Conversion from comoving to physical space
    • Sink formation
    • Gas accretion
    • Sink merging
    • IMF sampling
    • Star spawning
    • Stellar feedback
  • Sink timesteps
    • Sink 2-body encounters
    • Timesteps per sink’s age categories
    • Star formation constraint
  • Model parameters
    • Sink accretion radius
    • Guide to choose the the accretion radius or the density threshold
    • Comment on star formation efficiency
• Snapshots ouputs
  • Sink particles
  • Stars
  • Gas particles