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Gas Accretion on Local Group Galaxy Simulations

Code written for an ongoing analysis of the gas accretion rates onto the disc of Local Groyp galaxies from the Hestia project.

Description of Configuration Variables

This sections contains a description of each configuration variable found in configs/.

Name Type Unit Description
RUN_CODE str - The code of this configuration.
DISC_SIZE_SPHERICAL_CUT_CKPC float $\mathrm{ckpc}$ A spherical cut for the disc size calculation. All particles beyond this radius will be ignored when calculating the disc size.
DISC_SIZE_HEIGHT_CUT_CKPC float $\mathrm{ckpc}$ A height cut for the disc size calculation. All particles beyond this $z$ coordinate will be ignored when calculating the disc size.
DISC_ENCLOSED_MASS_PERCENTILE int - The percentile to use when calculating the enclosed mass fraction for the disc size. For example, if DISC_ENCLOSED_MASS_PERCENTILE = 90, the radius and height of the disc will enclose 90% of the total stellar mass of the subhalo.
VIRIAL_RADIUS_FRACTION float $1$ The fraction of the virial radius to use as disc size, if needed, for times smaller than VIRIAL_RADIUS_TIME_THRESHOLD_GYR.
VIRIAL_RADIUS_TIME_THRESHOLD_GYR float $\mathrm{Gyr}$ The time before which the disc radius will be replaced by a fraction of the virial radius if needed.
DISC_SIZE_SMOOTHING_WINDOW_LENGTH int - The window length to use in the Savitzky-Golay filter in the disc size calculation.
DISC_SIZE_SMOOTHING_POLYORDER int - The polynomial order to use in the Savitzky-Golay filter in the disc size calculation.
SMOOTHING_WINDOW_LENGTH int - The window length for the Savitzky-Golay filter for smoothing.
SMOOTHING_POLYORDER int - The polynomial order for the Savitzky-Golay filter for smoothing.
SUBHALO_VELOCITY_DISTANCE_CKPC float $\mathrm{ckpc}$ The spherical radius in ckpc to calculate the velocity of the main subhalo.
ROTATION_MATRIX_DISTANCE_CKPC float $\mathrm{ckpc}$ The spherical radius to calculate the orientation matrix.
REPOSITORY_NAME str - The name of the repository.
EREBOS_SIMULATION_PATH str - The path of the snapshot files in the Erebos system.
GAS_PARTICLE_TYPE int - The type of gas cells.
DARK_MATTER_PARTICLE_TYPE int - The type of dark matter particles.
STAR_PARTICLE_TYPE int - The type of star particles.
BG_PARTICLE_TYPE int - The type of black hole particles.
TRACER_PARTICLE_TYPE int - The type of tracer particles.
SMALL_HUBBLE_CONST float $1$ The "small" Hubble constant. To get the Hubble constant, multiply by $100~\mathrm{km} ~ \mathrm{s}^{-1} ~ \mathrm{Mpc}^{-1}$.
HUBBLE_CONST float $\mathrm{km} ~ \mathrm{s}^{-1} ~ \mathrm{Mpc}^{-1}$ The Hubble constant.
OMEGA_LAMBDA float $1$ The dark energy density (relative to the critical density of the universe).
OMEGA_MATTER float $1$ The matter density (relative to the critical density of the universe).
OMEGA_BARYONS float $1$ The baryon density (relative to the critical density of the universe).
OMEGA_0 float $1$ The total matter density (relative to the critical density of the universe).
FIRST_SNAPSHOT int - The first snapshot to analyze. Ignore all the previous snapshots. This is useful because the first snapshots may not have a main halo/subhalo properly identified.
N_SNAPSHOTS int - The total number of snapshots.
N_PROCESSES int - The number of processes for parallel calculations.