1. Yao-Yuan Mao
  2. AbundanceMatching

Overview

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AbundanceMatching

A python module to create (interpolate and extrapolate) abundance functions and also provide fiducial deconvolution (with Peter Behroozi's implementation) and abundance matching.

Installation

pip install https://bitbucket.org/yymao/abundancematching/get/master.zip

Example

Here's an example to do abundance matching with this code.

#Assume you have a numpy structured array `halos`, 
#which contains a list of halos, with labels of the quantity names.
#Assume you also have a luminosity function table `lf`, 
#whose first column st column is the quantity to match (e.g. magnitude), 
#and the second column is the abundance (per Mpc^3 per Mag).

import matplotlib.pyploy as plt
from AbundanceMatching import *
af = AbundanceFunction(lf[:,0], lf[:,1], (-27, -5))

#check the abundance function
plt.semilogy(lf[:,0], lf[:,1])
x = np.linspace(-27, -5, 101)
plt.semilogy(x, af(x))

#deconvolution and check results (it's a good idea to always check this)
scatter = 0.2
remainder = af.deconvolute(scatter*LF_SCATTER_MULT, 20)
x, nd = af.get_number_density_table()
plot(x, remainder/nd);

#get number densities of the halo catalog
nd_halos = calc_number_densities(halos['vpeak'], box_size)

#do abundance matching with no scatter
catalog = af.match(nd_halos)

#do abundance matching with some scatter
catalog_sc = af.match(nd_halos, scatter*LF_SCATTER_MULT)

#if you want to do multiple (100) realizations:
catalog_deconv = af.match(nd_halos, scatter*LF_SCATTER_MULT, False)
for __ in xrange(100):
    catalog_this = add_scatter(catalog_deconv, scatter*LF_SCATTER_MULT)
    catalog_this = rematch(catalog_this, catalog, af._x_flipped)
    # do something with catalog_this