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beginning to fold in HOD code with jeremy tinker's approval

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P.M. Sutter 2013-12-30 22:48:07 -06:00
parent d8108d3a8e
commit 44cd0eb71f
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36
c_tools/hod/nfw_transform.c Normal file
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#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "header.h"
void cisi(double x, double *ci, double *si);
/* The Fourier transform of the NFW profile.
* Inputs are wavenumber and halo mass.
* NB! -> Function assumes that profile of satellite GALAXIES is
* desired, therefore uses CVIR_FAC
*/
double nfw_transform(double xk, double m)
{
double c,rvir,kappa1,kappa2,f,y,ci1,ci2,si1,si2;
c=halo_concentration(m)*CVIR_FAC;
rvir=pow(3.0*m/(4.0*DELTA_HALO*PI*OMEGA_M*RHO_CRIT),1.0/3.0);
kappa1=xk*rvir/c;
kappa2=kappa1*(1.0+c);
f=log(1.0+c)-c/(1.0+c);
f=1.0/f;
cisi(kappa1,&ci1,&si1);
cisi(kappa2,&ci2,&si2);
y=-sin(kappa1*c)/kappa2;
y=y+sin(kappa1)*(si2-si1)+cos(kappa1)*(ci2-ci1);
y=f*y;
return(y);
}