SImple HOD ---------- .. image:: https://travis-ci.org/bccp/simplehod.svg?branch=master :target: https://travis-ci.org/bccp/simplehod This is an adoption of Martin White's simple HOD scheme into Python. No bloat intended. Just the bare basic stuff. - 'simplehod.hod' is the main entry point. - If only intended to draw satellites from NFW, use `simplehod.mksat`. - Drawing centrals, use `simplehod.mkcen`. - computing expected number of galaxies, use `simplehod.mkn`; use `simplehod.mknint` to draw integers from the expection. FAQ: - Q: What if I do not know the concentration of halos? A: use 5~7 is usually good enough. Or compute it from mass from some formula like halotools [1], or https://nbodykit.readthedocs.io/en/latest/api/_autosummary/nbodykit.transform.html#nbodykit.transform.HaloConcentration - Q: What if I do not know the virial radius of halos? A: https://nbodykit.readthedocs.io/en/latest/api/_autosummary/nbodykit.transform.html#nbodykit.transform.HaloRadius but note that function returns proper Mpc/h. So usually you want to modify this to comoving by divide by scaling factor. - Q: What if I do not know the velocity dispersion of halos? A: https://nbodykit.readthedocs.io/en/latest/api/_autosummary/nbodykit.transform.html#nbodykit.transform.HaloSigma (may be a broken link) A: https://nbodykit.readthedocs.io/en/latest/api/_autosummary/nbodykit.transform.html#nbodykit.transform.HaloVelocityDispersion .. [1] :: https://github.com/astropy/halotools/blob/v0.6/halotools/empirical_models/phase_space_models/analytic_models/satellites/nfw/conc_mass/dutton_maccio14.py#L11