eagle_100.yml 15.1 KB
Newer Older
1 2 3 4 5 6
# Define some meta-data about the simulation
MetaData:
  run_name:   EAGLE-L0100N1504-Ref

# Define the system of units to use internally. 
InternalUnitSystem:
7
  UnitMass_in_cgs:     1.98841e43    # 10^10 M_sun in grams
8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53
  UnitLength_in_cgs:   3.08567758e24 # Mpc in centimeters
  UnitVelocity_in_cgs: 1e5           # km/s in centimeters per second
  UnitCurrent_in_cgs:  1             # Amperes
  UnitTemp_in_cgs:     1             # Kelvin

# Cosmological parameters
Cosmology:
  h:              0.6777        # Reduced Hubble constant
  a_begin:        0.0078125     # Initial scale-factor of the simulation
  a_end:          1.0           # Final scale factor of the simulation
  Omega_m:        0.307         # Matter density parameter
  Omega_lambda:   0.693         # Dark-energy density parameter
  Omega_b:        0.0482519     # Baryon density parameter

# Parameters governing the time integration
TimeIntegration:
  dt_min:     1e-10 # 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:            eagle # Common part of the name of output files
  output_list_on:      1
  output_list:         ./output_list.txt

# Parameters governing the conserved quantities statistics
Statistics:
  delta_time:           1.02
  scale_factor_first:   0.05

# Parameters for the self-gravity scheme
Gravity:
  eta:                    0.025     # Constant dimensionless multiplier for time integration.
  theta:                  0.7       # Opening angle (Multipole acceptance criterion)
  mesh_side_length:       512
  comoving_DM_softening:         0.003320 # Comoving softening for DM (3.32 ckpc)
  max_physical_DM_softening:     0.001300 # Physical softening for DM (1.30 pkpc)
  comoving_baryon_softening:     0.001790 # Comoving softening for baryons (1.79 ckpc)
  max_physical_baryon_softening: 0.000700 # Physical softening for baryons (0.70 pkpc)
  dithering:             0

# 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).
  h_min_ratio:                       0.1      # Minimal smoothing in units of softening.
  h_max:                             0.5      # Maximal softening in co-moving internal units.
54
  CFL_condition:                     0.2      # Courant-Friedrich-Levy condition for time integration.
55 56 57 58 59 60 61 62 63 64 65 66 67 68 69
  minimal_temperature:               100.0    # (internal units)
  initial_temperature:               268.7    # (internal units)
  particle_splitting:                1        # Particle splitting is ON
  particle_splitting_mass_threshold: 7e-4     # (internal units, i.e. 7e6 Msun ~ 4x initial gas particle mass)

# Parameters of the stars neighbour search
Stars:
  resolution_eta:        1.1642   # Target smoothing length in units of the mean inter-particle separation
  h_tolerance:           7e-3

# Parameters for the Friends-Of-Friends algorithm
FOF:
  basename:                        fof_output  # Filename for the FOF outputs.
  min_group_size:                  256         # The minimum no. of particles required for a group.
  linking_length_ratio:            0.2         # Linking length in units of the main inter-particle separation.
70
  black_hole_seed_halo_mass_Msun:  1.0e10      # Minimal halo mass in which to seed a black hole (in solar masses).
71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90
  scale_factor_first:              0.01        # Scale-factor of first FoF black hole seeding calls.
  delta_time:                      1.005       # Scale-factor ratio between consecutive FoF black hole seeding calls.

Scheduler:
  max_top_level_cells:   64
  tasks_per_cell:        5
  cell_split_size:       200
  
Restarts:
  onexit:       1
  delta_hours:  1.0

# Parameters related to the initial conditions
InitialConditions:
  file_name:  EAGLE_L0100N1504_ICs.hdf5
  periodic:   1
  cleanup_h_factors: 1               # Remove the h-factors inherited from Gadget
  cleanup_velocity_factors: 1        # Remove the sqrt(a) factor in the velocities inherited from Gadget
  generate_gas_in_ics: 1             # Generate gas particles from the DM-only ICs
  cleanup_smoothing_lengths: 1       # Since we generate gas, make use of the (expensive) cleaning-up procedure.
91
  remap_ids: 1                       # Re-map the IDs to [1, N] to avoid collision problems when splitting
92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121

# Impose primoridal metallicity
EAGLEChemistry:
  init_abundance_metal:     0.
  init_abundance_Hydrogen:  0.752
  init_abundance_Helium:    0.248
  init_abundance_Carbon:    0.0
  init_abundance_Nitrogen:  0.0
  init_abundance_Oxygen:    0.0
  init_abundance_Neon:      0.0
  init_abundance_Magnesium: 0.0
  init_abundance_Silicon:   0.0
  init_abundance_Iron:      0.0

# EAGLE cooling parameters
EAGLECooling:
  dir_name:                ./coolingtables/
  H_reion_z:               7.5                 # Planck 2018
  H_reion_eV_p_H:          2.0
  He_reion_z_centre:       3.5
  He_reion_z_sigma:        0.5
  He_reion_eV_p_H:         2.0

# 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.
  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.
122
  min_over_density:                  100.0     # The over-density above which star-formation is allowed.
123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157
  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_entropy_margin_dex:            0.5       # Logarithm base 10 of the maximal entropy above the EOS at which stars can form.
  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
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:               8.0             # Minimal mass considered for SNII stars in solar masses.
  SNII_max_mass_Msun:             100.0             # Maximal mass considered for SNII stars in solar masses.
  SNII_sampled_delay:               1               # Sample the SNII lifetimes to do feedback.
  SNII_wind_delay_Gyr:              dummy           # Time in Gyr between a star's birth and the SNII thermal feedback event when not sampling.
  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.
158 159
  SNII_energy_fraction_min:         0.5             # Minimal fraction of energy applied in a SNII feedback event.
  SNII_energy_fraction_max:         5.0             # Maximal fraction of energy applied in a SNII feedback event.
160 161 162 163
  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.
164
  SNIa_DTD:                         Exponential     # Functional form of the SNIa delay time distribution.
165
  SNIa_DTD_delay_Gyr:               0.04            # Stellar age after which SNIa start in Gyr (40 Myr corresponds to stars ~ 8 Msun).
166 167
  SNIa_DTD_exp_timescale_Gyr:       2.0             # Time-scale of the exponential decay of the SNIa rates in Gyr.
  SNIa_DTD_exp_norm_p_Msun:         0.002           # Normalisation of the SNIa rates in inverse solar masses.
168 169 170 171 172 173 174 175 176 177
  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.
  stellar_evolution_age_cut_Gyr:    0.1             # Stellar age in Gyr above which the enrichment is down-sampled.
  stellar_evolution_sampling_rate:   10             # Number of time-steps in-between two enrichment events for a star above the age threshold.
  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.
178
  SNII_yield_factor_Magnesium:      2.0             # (Optional) Correction factor to apply to the Magnesium yield from the SNII channel.
179 180 181 182 183
  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.

# EAGLE AGN model
EAGLEAGN:
184
  subgrid_seed_mass_Msun:             1.0e4      # Black hole subgrid mass at creation time in solar masses.
185 186 187 188 189 190 191 192 193 194 195 196
  multi_phase_bondi:                  0          # Compute Bondi rates per neighbour particle?
  subgrid_bondi:                      0          # Compute Bondi rates using the subgrid extrapolation of the gas properties around the BH?
  with_angmom_limiter:                0          # Are we applying the Rosas-Guevara et al. (2015) viscous time-scale reduction term?
  viscous_alpha:                      1e6        # Normalisation constant of the viscous time-scale in the accretion reduction term
  radiative_efficiency:               0.1        # Fraction of the accreted mass that gets radiated.
  max_eddington_fraction:             1.         # Maximal allowed accretion rate in units of the Eddington rate.
  eddington_fraction_for_recording:   0.1        # Record the last time BHs reached an Eddington ratio above this threshold.
  coupling_efficiency:                0.1        # Fraction of the radiated energy that couples to the gas in feedback events.
  AGN_delta_T_K:                      3.16228e8  # Change in temperature to apply to the gas particle in an AGN feedback event in Kelvin.
  AGN_num_ngb_to_heat:                1.         # Target number of gas neighbours to heat in an AGN feedback event.
  max_reposition_mass:                1e20       # Maximal BH mass considered for BH repositioning in solar masses (large number implies we always reposition).
  max_reposition_distance_ratio:      3.0        # Maximal distance a BH can be repositioned, in units of the softening length.
197 198 199
  with_reposition_velocity_threshold: 0          # Should we only reposition to particles that move slowly w.r.t. the black hole?
  max_reposition_velocity_ratio:      0.5        # Maximal velocity offset of a particle to reposition a BH to, in units of the ambient sound speed of the BH. Only meaningful if with_reposition_velocity_threshold is 1.
  min_reposition_velocity_threshold: -1.0        # Minimal value of the velocity threshold for repositioning [km/s], set to < 0 for no effect. Only meaningful if with_reposition_velocity_threshold is 1.
200 201 202 203 204
  set_reposition_speed:               0          # Should we reposition black holes with (at most) a prescribed speed towards the potential minimum?
  threshold_major_merger:             0.333      # Mass ratio threshold to consider a BH merger as 'major'
  threshold_minor_merger:             0.1        # Mass ratio threshold to consider a BH merger as 'minor'
  merger_threshold_type:              2          # Type of velocity threshold for BH mergers (0: v_circ at kernel edge, 1: v_esc at actual distance, with softening, 2: v_esc at actual distance, no softening).
  merger_max_distance_ratio:          3.0        # Maximal distance over which two BHs can merge, in units of the softening length.