Halosky

Creating halo based maps of the sky

Installation

1. git clone https://github.com/marcelo-alvarez/halosky.git
2. cd halosky
3. pip install .

Running

Currently only runs on perlmutter without modification, where halosky.halopaint.makemap can be run on a login node (for development only, pass "parallel=False" as an argument to makemap; production runs should be on nodes requested through Slurm).

Example included here in scripts/example.py will produce 10 random tSZ maps and halo catalogs in the ./maps and ./catalogs directories.

import halosky as hs
import numpy as np

# create cosmology
cosmo = hs.cosmology.cosmology(
    omegab = 0.049,
    omegac = 0.261,
    h      = 0.68,
    ns     = 0.965,
    sigma8 = 0.81
)

# create hmf object (the cosmology for hmf is hardcoded currently)
hmf = hs.hmf.hmf()

# create lightcone object
lc = hs.lightcone.lightcone(cosmo=cosmo,fsky=1.0,Mmin=5e14)

#create halopaint object
hp = hs.halopaint.halopaint(nside=1024)

Nran = 10
for i in range(Nran):
    # sample halos from the halo mass function in the lightcone
    lc.populate(hmf.dndmofmz)

    # write halos in pksc halo format used in Websky
    catfile = './catalogs/cat_'+f'{i:05d}'+'.pksc'
    lc.write_pksc(catfile=catfile)

    # make map
    mapname = './maps/tsz_'+f'{i:05d}'
    hp.makemap(catfile=catfile,mapname=mapname,nproc=16,nodes=1)

    # clear halos from Lightcone
    lc.clear()