Pickle Contents¶
SPHGR stores data in a pickle file. This file is a serialization of objects similar to Java‘s JSON. This lets us store data in a way where upon reading it back in, all of the objects and functions associated with said objects are restored. The contents of the SPHGR pickle file contains a number of containers, which hold other objects; basically a way of organizing the data. The general idea is to have a hierarchy of data that looks something like this:
PICKLE
- container1
- data
- container2
- data
...
Which can then be accessed very easily. To get data within the first container you would refer to it like so:
> PICKLE.container1.data
These objects are very similar to a common struct, but are more flexible in that they can also contain functions or methods. The hierarchy of an SPHGR pickle file look something like this:
Global Attributes & Containers¶
note: - - denotes a container
pickleFile.:
- - rto # run-time-options - - constants # universal constants - - conversionFactors # conversion factors - - locs # file locations - - snapAttribs # snapshot info - - particleLists # holds methods to read in particle lists - - particleData # holds methods to read in particle data - - halos # list of all halo objects - - galaxies # list of all galaxy objects - halo_index_translator # - n_side # number of particles per side (N^1/3) - nparts # list of particle numbers (types 0-5) - h # Hubble parameter - boxsize # boxsize - boxsize_h # boxsize/h - redshift # redshift - time # scale factor - num_halos # number of halos - num_galaxies # number of galaxies - snapdir # snapshot directory - snapname # snapshot base name (excluding directory) - snapnum # snapshot number - snap # full snap path - pickle # path and name of pickle file - pprogress # run time parameter
rto¶
pickleFile.rto.:
- DEBUG - DS - EPSILON_FACT - GROUPDIRPREFIX - HDF5 - TIPSY - PERIODIC - SKIPRAN - SUPRESS - zoomSim - ZOOM_LOWRES - localDensitySearchFactor - pprogress - pygr_OPTS - snapnum_str
locs¶
pickleFile.locs.:
- GRID_DATA - LOSER_DATADIR - LOSER_FILES - PROGEN_DIR - PROGEN_GALAXY_FILE - PROGEN_HALO_FILE - RS_BINFILE - RS_DIR - RS_PARENTFILE - SKID_DIR - SKID_FILE - SKID_GRPFILE - SKID_STATFILE - snap - snapdir
constants¶
pickleFile.constants.:
- cm_per_mpc - kpc_to_cm - cm_to_kpc - Msun_in_g - protonmass_in_g - c - G - Boltzmann - cm_to_km - H_He_mass_in_g - UnitMass_in_g - UnitLength_in_cm - UnitVelocity_in_cm_per_s
conversionFactors¶
pickleFile.conversionFactors.:
- LCONVERT # --> kpc - MCONVERT # --> Msun - rconvert # length conversion factor [1/(1+z)] - vfactor # velocity conversion factor [sqrt(a)] - VCONVERT # --> km/s - RS_L_CONVERT # RS length conversion factor --> Mpc/h - RS_M_CONVERT # RS mass conversion factor --> Msun/h - TIPSY_L_convert # TIPSY length conversion factor - TIPSY_V_convert # TIPSY velocity conversion factor - TIPSY_M_convert # TIPSY mass conversion factor - TIPSY_RHO_convert # TIPSY density conversion factor
snapAttribs¶
pickleFile.snapAttribs.:
- DM_ONLY # set to 1 if this is a DM only sim - redshift # redshift - time # scale factor - h # hubble parameter - O0 # matter density - Ol # vacuum energy density - boxsize # size of the box (no little h) - boxsize_h # size of the box (little h divided out) - n_gas # number of type [0] gas particles - n_star # number of type [4] star particles - n_dm # number of type [1] dm particles - n_bulge # number of type [3] bulge particles - n_disk # number of type [2] disk particles - n_bndry # number of type [5] bndry particles - nparts # list - [n_gas,n_dm,n_bulge,n_disk,n_star,n_bndry] - nfiles # number of files for this snapshot - flagSFR # SFR flag - flagFB # FB flag - flagCooling # Cooling flag - flagAge # Stellar Age flag - flagFH2 # fH2 flag
particleData¶
pickleFile.particleData.:
- getParticleIDs() - getParticleData() - deleteParticleIDs() - deleteParticleData() - cleanUp()
particleLists¶
pickleFile.particleLists.:
- getParticleLists() - saveParticleLists()
galaxies (galaxy class)¶
pickleFile.galaxies[N].:
- cm # x,y,z center-of-mass - vel # x,y,z center-of-mass velocities - HMR # half-mass-radius (SKID) - FMR # full-mass-radius (SKID) - stellar_FMR # maximum stellar radius - gas_mass # total gas mass - stellar_mass # total stellar mass - total_mass # gas + stellar - HImass # HI mass - H2mass # H2 mass - Hmass # H mass - HMR_cv # circular velocity at HMR (SKID) - FMR_cv # circular velocity at FMR (SKID) - max_cv # maximum circular velocity - max_cv_r # radius at maximum vphi - sigma1d # 1D velocity dispersion - central # -1=unassigned, 0=satellite, 1=central - originalIndex # original SKID index - sfr # total SFR - Z # SFR-weighted metallicity - mwZ # MASS-weighted metallicity - glist # indexes of gas particles that belong to this gal - slist # indexes of star particles that belong to this gal - L # Lx,Ly,Lz angular momentum vector - ALPHA # first rotation angle to align L with z-axis - BETA # second rotation angle to align L with z-axis - local_mass_density # local mass density of galaxies - local_number_density # local number density of galaxies - halo_index # index of corresponding RS halo - halo_distance # distance between galaxy CoM and halo CoM - halo_dm_mass # total DM mass within the halo - halo_gmass # total gas mass within the halo - halo_smass # total stellar mass within the halo - halo_total_mass # halo_gas + halo_star + halo_dm mass - halo_mass # total DM mass within the halo - halo_isparent # -1=parent, anything else is substructure
halos (halo class)¶
pickleFile.halos[N].:
- cm # x,y,z center-of-mass - r200 # radius - maxrad # maximum radius - L # Lx,Ly,Lz angular momentum vector - hparent # -1=parent, anything else is substructure - particle_count # number of DM particles - galaxy_list # list of galaxy indexes contained within this halo - subhalos # list of subhalo indexes contained - glist # indexes of gas particles that belong to this halo - slist # indexes of star particles that belong to this halo - dmlist # indexes of dm particles that belong to this halo - lrlist # list of low-res particles (if present) - mass # virial mass given by RS - dm_mass # total DM mass within the halo - gas_mass # total gas mass within the halo - stellar_mass # total stellar mass within the halo - total_mass # gas + star + dm mass - local_mass_density # local mass density of halos - local_number_density # local number density of halos - energy # - spin # - vmax # - rvmax # - vrms # - originalIndex #