isolated_galaxy.yml

# Define the system of units to use internally.
InternalUnitSystem:
  UnitMass_in_cgs:     1.98848e43    # 10^10 M_sun in grams
  UnitLength_in_cgs:   3.08567758e21 # 1 kpc in cm
  UnitVelocity_in_cgs: 1e5           # 1 km/s in cm/s
  UnitCurrent_in_cgs:  1             # Amperes
  UnitTemp_in_cgs:     1             # Kelvin

# Parameters for the self-gravity scheme
Gravity:
  eta:          0.025               # Constant dimensionless multiplier for time integration.
  theta:        0.7                 # Opening angle (Multipole acceptance criterion).
  max_physical_DM_softening:     0.1       # Physical softening length (in internal units).
  max_physical_baryon_softening: 0.1       # Physical softening length (in internal units).

# Parameters governing the time integration (Set dt_min and dt_max to the same value for a fixed time-step run.)
TimeIntegration:
  time_begin:        0.    # The starting time of the simulation (in internal units).
  time_end:          0.1   # The end time of the simulation (in internal units).
  dt_min:            1e-9  # The minimal time-step size of the simulation (in internal units).
  dt_max:            1e-2  # The maximal time-step size of the simulation (in internal units).

# Parameters governing the snapshots
Snapshots:
  basename:   output      # Common part of the name of output files
  time_first: 0.          # (Optional) Time of the first output if non-cosmological time-integration (in internal units)
  delta_time: 0.001        # Time difference between consecutive outputs (in internal units)

# Parameters governing the conserved quantities statistics
Statistics:
  delta_time:           1e-2     # Time between statistics output
  time_first:             0.     # (Optional) Time of the first stats output if non-cosmological time-integration (in internal units)

# Parameters related to the initial conditions
InitialConditions:
  file_name:               lowres8.hdf5 # The file to read
  periodic:                0        # Are we running with periodic ICs?
  stars_smoothing_length:  0.5
  
# Parameters for the hydrodynamics scheme
SPH:
  resolution_eta:        1.2348   # Target smoothing length in units of the mean inter-particle separation (1.2348 == 48Ngbs with the cubic spline kernel).
  CFL_condition:         0.1      # Courant-Friedrich-Levy condition for time integration.
  h_min_ratio:           0.1      # Minimal smoothing in units of softening.
  h_max:                 10.
  minimal_temperature:   100.

# Parameters for the stars neighbour search
Stars:
  overwrite_birth_time:    1     # Make sure the stars in the ICs do not do any feedback
  birth_time:             -1.    # by setting all of their birth times to -1  

# Standard EAGLE cooling options
EAGLECooling:
  dir_name:                ./coolingtables/  # Location of the Wiersma+08 cooling tables
  H_reion_z:               11.5              # Redshift of Hydrogen re-ionization
  H_reion_eV_p_H:          2.0               # Energy inject by Hydrogen re-ionization in electron-volt per Hydrogen atom
  He_reion_z_centre:       3.5               # Redshift of the centre of the Helium re-ionization Gaussian
  He_reion_z_sigma:        0.5               # Spread in redshift of the  Helium re-ionization Gaussian
  He_reion_eV_p_H:         2.0               # Energy inject by Helium re-ionization in electron-volt per Hydrogen atom

# Use solar abundances
EAGLEChemistry:
  init_abundance_metal:     0.0129   
  init_abundance_Hydrogen:  0.7065   
  init_abundance_Helium:    0.2806   
  init_abundance_Carbon:    0.00207  
  init_abundance_Nitrogen:  0.000836 
  init_abundance_Oxygen:    0.00549  
  init_abundance_Neon:      0.00141  
  init_abundance_Magnesium: 0.000591 
  init_abundance_Silicon:   0.000683 
  init_abundance_Iron:      0.0011   

# Hernquist potential parameters
HernquistPotential:
  useabspos:       0       # 0 -> positions based on centre, 1 -> absolute positions 
  position:        [0.,0.,0.]    # Location of centre of isothermal potential with respect to centre of the box (if 0) otherwise absolute (if 1) (internal units)
  idealizeddisk:   1       # Run with an idealized galaxy disk
  M200:            137.0   # M200 of the galaxy disk
  h:               0.704   # reduced Hubble constant (value does not specify the used units!)
  concentration:   9.0     # concentration of the Halo
  diskfraction:    0.040   # Disk mass fraction
  bulgefraction:   0.014   # Bulge mass fraction
  timestep_mult:   0.01    # Dimensionless pre-factor for the time-step condition, basically determines the fraction of the orbital time we use to do the time integration
  epsilon:         0.1     # Softening size (internal units)
 
# EAGLE star formation parameters
EAGLEStarFormation:
  EOS_density_norm_H_p_cm3:          0.1       # Physical density used for the normalisation of the EOS assumed for the star-forming gas in Hydrogen atoms per cm^3.
  EOS_temperature_norm_K:            8000      # Temperature om the polytropic EOS assumed for star-forming gas at the density normalisation in Kelvin.
  EOS_gamma_effective:               1.3333333 # Slope the of the polytropic EOS assumed for the star-forming gas.
  gas_fraction:                      0.3       # The gas fraction used internally by the model.
  KS_normalisation:                  1.515e-4  # The normalization of the Kennicutt-Schmidt law in Msun / kpc^2 / yr.
  KS_exponent:                       1.4       # The exponent of the Kennicutt-Schmidt law.
  min_over_density:               57.7      # The over-density above which star-formation is allowed.
  KS_high_density_threshold_H_p_cm3: 1e3       # Hydrogen number density above which the Kennicut-Schmidt law changes slope in Hydrogen atoms per cm^3.
  KS_high_density_exponent:          2.0       # Slope of the Kennicut-Schmidt law above the high-density threshold.
  EOS_temperature_margin_dex:         0.5       # Logarithm base 10 of the maximal temperature difference above the EOS allowed to form stars.
  threshold_norm_H_p_cm3:            0.1       # Normalisation of the metal-dependant density threshold for star formation in Hydrogen atoms per cm^3.
  threshold_Z0:                      0.002     # Reference metallicity (metal mass fraction) for the metal-dependant threshold for star formation.
  threshold_slope:                   -0.64     # Slope of the metal-dependant star formation threshold
  threshold_max_density_H_p_cm3:     10.0      # Maximal density of the metal-dependant density threshold for star formation in Hydrogen atoms per cm^3.
  
# Parameters for the EAGLE "equation of state"
EAGLEEntropyFloor:
  Jeans_density_threshold_H_p_cm3: 0.1       # Physical density above which the EAGLE Jeans limiter entropy floor kicks in expressed in Hydrogen atoms per cm^3.
  Jeans_over_density_threshold:    10.       # Overdensity above which the EAGLE Jeans limiter entropy floor can kick in.
  Jeans_temperature_norm_K:        8000      # Temperature of the EAGLE Jeans limiter entropy floor at the density threshold expressed in Kelvin.
  Jeans_gamma_effective:           1.3333333 # Slope the of the EAGLE Jeans limiter entropy floor
  Cool_density_threshold_H_p_cm3: 1e-5       # Physical density above which the EAGLE Cool limiter entropy floor kicks in expressed in Hydrogen atoms per cm^3.
  Cool_over_density_threshold:    10.        # Overdensity above which the EAGLE Cool limiter entropy floor can kick in.
  Cool_temperature_norm_K:        8000       # Temperature of the EAGLE Cool limiter entropy floor at the density threshold expressed in Kelvin.
  Cool_gamma_effective:           1.         # Slope the of the EAGLE Cool limiter entropy floor

# EAGLE feedback model with constant feedback energy fraction
EAGLEFeedback:
  use_SNII_feedback:                1               # Global switch for SNII thermal (stochastic) feedback.
  use_SNIa_feedback:                1               # Global switch for SNIa thermal (continuous) feedback.
  use_AGB_enrichment:               1               # Global switch for enrichement from AGB stars.
  use_SNII_enrichment:              1               # Global switch for enrichement from SNII stars.
  use_SNIa_enrichment:              1               # Global switch for enrichement from SNIa stars.
  filename:                         ./yieldtables/  # Path to the directory containing the EAGLE yield tables.
  IMF_min_mass_Msun:                0.1             # Minimal stellar mass considered for the Chabrier IMF in solar masses.
  IMF_max_mass_Msun:              100.0             # Maximal stellar mass considered for the Chabrier IMF in solar masses.
  SNII_min_mass_Msun:               6.0             # Minimal mass considered for SNII feedback (not SNII enrichment!) in solar masses.
  SNII_max_mass_Msun:             100.0             # Maximal mass considered for SNII feedback (not SNII enrichment!) in solar masses.
  SNII_wind_delay_Gyr:              0.001            # Time in Gyr between a star's birth and the SNII thermal feedback event.
  SNII_delta_T_K:                   3.16228e7       # Change in temperature to apply to the gas particle in a SNII thermal feedback event in Kelvin.
  SNII_energy_erg:                  1.0e51          # Energy of one SNII explosion in ergs.
  SNII_energy_fraction_min:         1.0             # Minimal fraction of energy applied in a SNII feedback event.
  SNII_energy_fraction_max:         1.0             # Maximal fraction of energy applied in a SNII feedback event.
  SNII_energy_fraction_Z_0:         0.0012663729    # Pivot point for the metallicity dependance of the SNII energy fraction (metal mass fraction).
  SNII_energy_fraction_n_0_H_p_cm3: 1.4588          # Pivot point for the birth density dependance of the SNII energy fraction in cm^-3.
  SNII_energy_fraction_n_Z:         0.8686          # Power-law for the metallicity dependance of the SNII energy fraction.
  SNII_energy_fraction_n_n:         0.8686          # Power-law for the birth density dependance of the SNII energy fraction.
  SNIa_max_mass_Msun:              8.0              # Maximal mass considered for SNIa feedback and enrichment in solar masses.
  SNIa_timescale_Gyr:              2.0              # Time-scale of the exponential decay of the SNIa rates in Gyr.
  SNIa_efficiency_p_Msun:          0.002            # Normalisation of the SNIa rates in inverse solar masses.
  SNIa_energy_erg:                 1.0e51           # Energy of one SNIa explosion in ergs.
  AGB_ejecta_velocity_km_p_s:      10.0             # Velocity of the AGB ejectas in km/s.
  SNII_yield_factor_Hydrogen:       1.0             # (Optional) Correction factor to apply to the Hydrogen yield from the SNII channel.
  SNII_yield_factor_Helium:         1.0             # (Optional) Correction factor to apply to the Helium yield from the SNII channel.
  SNII_yield_factor_Carbon:         0.5             # (Optional) Correction factor to apply to the Carbon yield from the SNII channel.
  SNII_yield_factor_Nitrogen:       1.0             # (Optional) Correction factor to apply to the Nitrogen yield from the SNII channel.
  SNII_yield_factor_Oxygen:         1.0             # (Optional) Correction factor to apply to the Oxygen yield from the SNII channel.
  SNII_yield_factor_Neon:           1.0             # (Optional) Correction factor to apply to the Neon yield from the SNII channel.
  SNII_yield_factor_Magnesium:      2.0             # (Optional) Correction factor to apply to the Magnesium yield from the SNII channel.
  SNII_yield_factor_Silicon:        1.0             # (Optional) Correction factor to apply to the Silicon yield from the SNII channel.
  SNII_yield_factor_Iron:           0.5             # (Optional) Correction factor to apply to the Iron yield from the SNII channel.