halomod.tools.populate

halomod.tools.populate(centres: numpy.ndarray, masses: numpy.ndarray, halomodel=None, profile: Optional[halomod.profiles.Profile] = None, hodmod: Optional[halomod.hod.HOD] = None, edges: Optional[numpy.ndarray] = None)[source]

Populate a series of DM halos with a tracer, given a HOD model.

Parameters

  • centres ((N,3)-array) – The cartesian co-ordinates of the centres of the halos

  • masses (array_like) – The masses (in M_sun/h) of the halos

  • halomodel (type halomod.HaloModel) – A HaloModel object. One can either use this, or both halo_profile and hodmod arguments.

  • profile (type halo_profile.Profile, optional) – A density halo_profile to use. Only required if halomodel not given.

  • hodmod (object of type hod.HOD, optional) – A HOD model to use to populate the dark matter. Only required if halomodel not given.

  • edges (float, len(2) iterable, or (2,3)-array) – Periodic box edges. If float, defines the upper limit of cube, with lower limit at zero. If len(2) iterable, defines edges of cube. If (2,3)-array, specifies edges of arbitrary rectangular prism.

Returns

  • pos (array) – (N,3)-array of positions of galaxies.

  • halo (array) – (N)-array of associated haloes (by index)

  • H (int) – Number of central galaxies. The first H galaxies in pos/halo correspond to centrals.