AHFStars

This table stores the properties of the stellar component of each AHF halo. The ahfIds correspond to the same ids as in the corresponding main AHF table.

Column Type UCD Unit Description
ahfId bigint meta.id; meta.main unique id for AHF-halo, e.g.
ahfId = ( snapnum*106 + (original number in AHF catalogue) )
The power of 10 can be different for each simulation database.
snapnum smallint time.epoch number of snapshot
n_star bigint meta.number number of star particles in the halo
M_star float phys.mass 1/h Msun total mass of star particles
lambda_star float spin parameter (Bullock et al. 2001 definition)
lambdaE_star float classical spin parameter (Peebles’ definition)
Lx_star float phys.angMomentum; pos.cartesian.x x-component of the angular momentum vector; normalized, i.e. |L| = 1
Ly_star float phys.angMomentum; pos.cartesian.y y-component of the angular momentum vector
Lz_star float phys.angMomentum; pos.cartesian.z z-component of the angular momentum vector
b_star float arith.ratio ratio of intermediate to major axis; derived from 2. eigenvalue of the inertia tensor
c_star float arith.ratio ratio of minor to major axis
Eax_star float x-component of the major axis (normalized)
Eay_star float y-component of the major axis (normalized)
Eaz_star float z-component of the major axis (normalized)
Ebx_star float x-component of the intermediate axis (normalized)
Eby_star float y-component of the intermediate axis (normalized)
Ebz_star float z-component of the intermediate axis (normalized)
Ecx_star float x-component of the minor axis (normalized)
Ecy_star float y-component of the minor axis (normalized)
Ecz_star float z-component of the minor axis (normalized)
Ekin_star float phys.energy Msun/h (km/s)2 kinetic energy
Epot_star float phys.energy Msun/h (km/s)2 potential energy
mean_z_star float phys.abundance average metallicity of stars

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