snapread: Read in Gadget snapshots

In asgr/simpack: Functions for calculating orbits and interacting with the Gadget N-body code

Description

This function allows the user to read in the standard format Gadget binaries. It keeps the particle information and header information in separate components of a list.

Usage

snapread(file)

Arguments

file	The full path to the Gadget snapshot to be read in.

Value

part

A data.frame containing the main particle level information. Columns included are: ID particle ID x x position in units of Mpc y y position in units of Mpc z z position in units of Mpc vx x velocity vy y velocity vz z velocity Mass particle mass in units of Msun

head

A list containing various header information as list elements. These are: Npart Vector of length 6 containing the number of particles in this snapshot file, where: gas [1] / collisionless particles [2:6] Massarr Vector of length 6 containing the particle masses for the respective particle types in Npart Time Time of snapshot in units of km/s and kpc so 1 unit is ~10 Gyrs z Redshift of snapshot FlagSfr Star formation turned on/off Nall Vector of length 6 containing the number of particles in all snapshot files, where: gas [1] / collisionless particles [2:6] FlagFeedback Feedback turned on/off FlagCooling Cooling turned on/off NumFiles Number of files per snapshot- usually 1 BoxSize Size of simulation box edge length in units of kpc OmegaM Omega matter of the simulation OmegaL Omega lambda of the simulation h Hubble constant divided by 100 used in the simulation FlagAge Stellar ages on/off FlagMetals Stellar metallacities on/off NallHW Tell Gadget to use large integers for the respective particle types in Npart - not usually necessary flag_entr_ics Entropy for gas on/off

Author(s)

Aaron Robotham, Chris Power

See Also

snapwrite,genhalo,addhead,genparam,cosdist,virialfuncs

Examples

## Not run: 
temp=snapread('somepath/snapshot_XXX')

## End(Not run)

asgr/simpack documentation built on May 12, 2019, 4:40 a.m.