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e_einasto.c
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/*fichier source pour le profil de Einasto
ROBERT Fr馘駻ic 17 Juin 2013*/
/****************************************************************/
/* name: e_einasto */
/* author: Robert Fr馘駻ic */
/* date: 06/2013 */
/* place: Lyon, CRAL */
/****************************************************************/
#include<stdio.h>
#include<math.h>
#include<fonction.h>
#include<constant.h>
#include<dimension.h>
#include<structure.h>
#include<stdlib.h>
#include<string.h>
#define ITMAX 100
#define EPS 3.0e-7
#define FPMIN 1.0e-30
static double d(double n);
//einasto
#define CMAX 20
#define LMAX 80
extern float Tab1[LMAX][CMAX];
extern float Tab2[LMAX][CMAX];
extern float Tab3[LMAX][CMAX];
// From Numerical recipes
static double gammln(double xx);
static double gammp(double a, double x);
static void gser(double *gamser, double a, double x, double *gln);
static void gcf(double *gammcf, double a, double x, double *gln);
static double d(double n)
{
return( 3.*n-1./3 + 8./1215./n + 184./229635./n/n/ + 1048./31000725./n/n/n - 17557576./1242974068875./n/n/n/n);
}
float einasto_masse( double r, double rs, int n, double rhos)
{
/* D'apr鑚 l'article analytical properties of einasto dark matter haloes */
float r_2=(rs*pow(2*n,n))/pow(d(n),n);
float rho_2=(rhos*exp(d(n)))/exp(2*n);
float h=r_2/pow(2*n,n);
float rho_0=rho_2*exp(2*n);
float x=r/h;
float rapport=pow(r/r_2,2);
float log_rapport=log10(rapport);
int val_a_chercher=floor((log_rapport+5)/0.1);
float masse=(sqrt(n)*rho_0*pow(h,3))/(2*pow((2*M_PI),n-2))*pow(x,3)*Tab1[val_a_chercher][2*n-1];
return masse;
}
float einasto_sigma( double r, double rs, int n, double rhos)
{
float r_2=(rs*pow(2*n,n))/pow(d(n),n);
float rho_2=(rhos*exp(d(n)))/exp(2*n);
float h=r_2/pow(2*n,n);
float rho_0=rho_2*exp(2*n);
float x=r/h;
float rapport=pow(r/r_2,2);
float log_rapport=log10(rapport);
int val_a_chercher=floor((log_rapport+5)/0.1);
float sigma=(sqrt(n)*rho_0*h)/(pow((2*M_PI),n-1))*x*Tab2[val_a_chercher][2*n-1];
return sigma;
}
float einasto_kappa( double r, double rs, int n, double rhos, double kappa_crit)
{
float r_2=(rs*pow(2*n,n))/pow(d(n),n);
float rho_2=(rhos*exp(d(n)))/exp(2*n);
float h=r_2/pow(2*n,n);
float rho_0=rho_2*exp(2*n);
float x=r/h;
float rapport=pow(r/r_2,2);
float log_rapport=log10(rapport);
int val_a_chercher=floor((log_rapport+5)/0.1);
float kappa_x=((kappa_crit)/(2*pow(2*M_PI,n-1)*sqrt(n)*exp(gammln(n))))*x*Tab2[val_a_chercher][2*n-1];
return kappa_x;
}
float einasto_kappa_av( double r, double rs, int n, double rhos, double kappa_crit)
{
float r_2=(rs*pow(2*n,n))/pow(d(n),n);
float rho_2=(rhos*exp(d(n)))/exp(2*n);
float h=r_2/pow(2*n,n);
float rho_0=rho_2*exp(2*n);
float x=r/h;
float rapport=pow(r/r_2,2);
float log_rapport=log10(rapport);
int val_a_chercher=floor((log_rapport+5)/0.1);
float kappa_av=((kappa_crit)/(2*pow(2*M_PI,n-1)*sqrt(n)*exp(gammln(n))))*x*Tab1[val_a_chercher][2*n-1];
return kappa_av;
}
double einasto_gamma( double r, double rs, int n, double rhos, double kappa_crit)
{
return(einasto_kappa_av(r,rs,n,rhos,kappa_crit)-einasto_kappa(r,rs,n,rhos,kappa_crit));
}
double einasto_kappa_eps(double r, double rs, double n, double theta, double kappa_crit, double rhos, double eps)
{
double kappa_eps;
kappa_eps=einasto_kappa(r,rs,n,rhos, kappa_crit)+eps*cos(2.*theta)*einasto_gamma(r,rs,n,rhos,kappa_crit);
return(kappa_eps);
}
struct point einasto_gamma_eps(double r, double rs, double n, double theta, double kappa_crit, double rhos,double eps)
{
struct point gamma_eps;
double kappa, gamma;
kappa = einasto_kappa(r, rs, n,rhos, kappa_crit);
gamma = einasto_gamma(r,rs,n,rhos,kappa_crit);
// gamma_eps = sqrt(pow(einasto_gamma(r, rs, n,rhos, kappa_crit), 2.) + 2.*eps * cos(2.*theta) * einasto_kappa(r, rs, n,rhos, kappa_crit) * einasto_gamma(r, rs, n,rhos, kappa_crit) + eps * eps * (pow(einasto_kappa(r, rs, n,rhos, kappa_crit), 2.) - pow(sin(2.*theta) * einasto_gamma(r, rs, n,rhos, kappae), 2.)));
gamma_eps.x = gamma * cos(2. * theta) + eps * kappa; // gamma1
gamma_eps.y = -sqrt(1. - eps * eps) * gamma * sin(2. * theta); // gamma2
return(gamma_eps);
}
float einasto_phi(double r, double rs, int n, double rhos, double kappa_crit)
{
float r_2=(rs*pow(2*n,n))/pow(d(n),n);
float rho_2=(rhos*exp(d(n)))/exp(2*n);
float h=r_2/pow(2*n,n);
float rho_0=rho_2*exp(2*n);
float x=r/h;
float rapport=pow(r/r_2,2);
float log_rapport=log10(rapport);
int val_a_chercher=floor((log_rapport+5)/0.1);
float phi=((kappa_crit)/(4*pow(2*M_PI,n-1)*sqrt(n)*exp(gammln(n))))*pow(x,3)*Tab3[val_a_chercher][2*n-1];
return phi;
}
float einasto_alpha( double r, double rs, int n, double rhos, double kappa_crit)
{
float r_2=(rs*pow(2*n,n))/pow(d(n),n);
float rho_2=(rhos*exp(d(n)))/exp(2*n);
float h=r_2/pow(2*n,n);
float rho_0=rho_2*exp(2*n);
float x=r/h;
float rapport=pow(r/r_2,2);
float log_rapport=log10(rapport);
int val_a_chercher=floor((log_rapport+5)/0.1);
float alpha=((kappa_crit)/(2*pow(2*M_PI,n-1)*sqrt(n)*exp(gammln(n))))*pow(x,2)*Tab1[val_a_chercher][2*n-1];
return alpha;
}
/****************** Partie numerical recipes in C *****************/
static double gammln(double xx)
{
double x,y,tmp,ser;
double cof[6]={ 76.18009172947146,
-86.50532032941677,
24.01409824083091,
-1.231739572450155,
0.1208650973866179e-2,
-0.5395239384953e-5};
int j;
y=x=xx;
tmp =x+5.5;
tmp -= (x+0.5)*log(tmp);
ser=1.000000000190015;
for (j=0;j<=5;j++) ser += cof[j]/++y;
return -tmp+log(2.5066282746310005*ser/x);
}
/* --------------------------------------------------------------*/
/* Pointers (Global variables?) used :
* - *gammcf, *gamser, *gln
* Returns the incomplete gamma function
* Taken from Numerical Recipes in C, second edition
* */
static double gammp(double a, double x)
{
double gamser,gammcf,gln;
if( x < 0.0 || a <= 0.0 )
fprintf(stderr, "ERROR: (Sersic:gammp) Invalid arguments\n");
if( x < a + 1.0 )
{
gser(&gamser,a,x,&gln);
return gamser;
}
else
{
gcf(&gammcf,a,x,&gln);
return 1.0-gammcf;
}
}
/* --------------------------------------------------------------*/
/* Pointers (Global variables?) used :
* *gamser, *gln
*
* Taken from Numerical Recipes in C, second edition
* */
static void gser(double *gamser, double a, double x, double *gln)
{
int n;
double sum,del,ap;
*gln=gammln(a);
if( x <= 0.0 )
{
if( x < 0.0 )
fprintf(stderr,"ERROR: (Sersic:gser) x less than 0\n");
*gamser=0.0;
return;
}
else
{
ap=a;
del=sum=1.0/a;
for (n=1;n<=ITMAX;n++)
{
++ap;
del *= x/ap;
sum += del;
if (fabs(del) < fabs(sum)*EPS)
{
*gamser=sum*exp(-x+a*log(x)-(*gln));
return;
}
}
fprintf(stderr,"ERROR: (Einasto:gser) a too large, ITMAX too small\n");
}
}
/* --------------------------------------------------------------*/
/* Pointers used (global variables?) :
* *gammcf, *gln
*
* Taken from Numerical Recipes in C, second edition
* */
static void gcf(double *gammcf, double a, double x, double *gln)
{
int i;
double an,b,c,d,del,h;
*gln=gammln(a);
b=x+1.0-a;
c=1.0/FPMIN;
d=1.0/b;
h=d;
for (i=1;i<=ITMAX;i++)
{
an = -i*(i-a);
b += 2.0;
d=an*d+b;
if (fabs(d) < FPMIN) d=FPMIN;
c=b+an/c;
if (fabs(c) < FPMIN) c=FPMIN;
d=1.0/d;
del=d*c;
h *= del;
if (fabs(del-1.0) < EPS) break;
}
if (i > ITMAX)
fprintf(stderr,"ERROR: (Einasto:gcf) a too large, ITMAX too small\n");
*gammcf=exp(-x+a*log(x)-(*gln))*h;
}
#undef ITMAX
#undef EPS
#undef FPMIN

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