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s_compmag.c
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Sat, Jan 4, 13:14

s_compmag.c
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#include<math.h>
#include<constant.h>
#include<fonction.h>
#undef PC
#define PC 3.085678e16 /* one parsec in MKS */
/* estimate magnitude knowing type,z and absolute magnitude,
as well as compute other important parameters
*/
void s_compmag(struct galaxie *gal, int *idum)
{
const extern struct g_cosmo C;
double dm, dl, dltpc, da;
double id, idc, ib, mabsb, mabsd;
double ar;
double color = 1;
/*distance modulus difference with respect to h=0.5 */
dm = 5.0 * log10(C.h);
/*define luminosity distance dl as in Weinberg (1972) */
dl = D0pc / C.h * dlumcosmo1(gal->z);
dltpc = dl / 10.0; /* to use absolute magnitudes. */
/*idem for angular distance da */
da = dl / ((1 + gal->z) * (1 + gal->z));
if (gal->type <= -4) /*- pure elliptical profile */
{
mabsd = 0.0;
mabsb = gal->magabs;
}
else /* - B/D ratio from Simien (1988) */
{
if (gal->type == -3)
mabsb = gal->magabs + 0.713;
else
mabsb = gal->magabs + 0.713 + 0.160 * gal->type + 0.042 * gal->type * gal->type;
mabsd = -2.5 * log10(pow(10.0, -0.4 * gal->magabs)
- pow(10.0, -0.4 * mabsb));
}
/*compute axis ratio from inclination */
/* ar = fabs(cos(gal->inclination*DEG));
if (ar<0.15)*/
ar = 0.15;
/*compute the total observed intensities */
ib = pow(10.0, -0.4 * (mabsb - 1.5 * color)) / (dltpc * dltpc);
if (gal->type > 0)
id = pow(10.0, -0.4 * (mabsd - 0.7 * color)) / (dltpc * dltpc);
else if (gal->type > -4)
id = pow(10.0, -0.4 * (mabsd - 1.5 * color)) / (dltpc * dltpc);
else
id = 0.0;
/*now the K+e-correction from Metcalfe et al. (1991) */
ib *= pow(10.0, -0.4 * ( /* = E galaxy */
-0.109 + 0.061 * color + (5.700 - 5.463 * color) * gal->z
+ (-4.919 + 7.518 * color) * gal->z * gal->z
+ (-0.286 - 3.560 * color) * gal->z * gal->z * gal->z
+ (0.558 + 0.603 * color) * gal->z * gal->z * gal->z * gal->z));
if (gal->type > 7 && gal->type < 20)
{
id *= pow(10.0, -0.4 * ( /* = Sdm galaxy */
-0.003 + 0.003 * color
+ (2.411 - 2.187 * color) * gal->z
+ (-4.288 + 6.167 * color) * gal->z * gal->z
+ (2.272 - 4.332 * color) * gal->z * gal->z * gal->z
+ (-0.4158 + 0.940 * color) * gal->z * gal->z * gal->z * gal->z));
/*disk extinction following De Vaucouleurs et al. 1991 et Cardelli et al. 1989 */
idc = id * pow(ar,
-0.4 * (color < 0.5 ? 1.0 : 0.564) * (1.5 - 0.03 * (gal->type - 5.0) * (gal->type - 5.0)));
}
else if (gal->type > 0 && gal->type <= 7)
{
id *= pow(10.0, -0.4 * ( /* = Scd galaxy */
-0.037 + 0.062 * color
+ (4.044 - 4.124 * color) * gal->z
+ (-4.660 + 8.629 * color) * gal->z * gal->z
+ (1.863 - 5.273 * color) * gal->z * gal->z * gal->z
+ (-0.247 + 1.039 * color) * gal->z * gal->z * gal->z * gal->z));
/*disk extinction following De Vaucouleurs et al. 1991 et Cardelli et al. 1989 */
idc = id * pow(ar,
-0.4 * (color < 0.5 ? 1.0 : 0.564) * (1.5 - 0.03 * (gal->type - 5.0) * (gal->type - 5.0)));
}
else
{
id *= pow(10.0, -0.4 * ( /* = S0 galaxy */
-0.109 + 0.061 * color
+ (5.700 - 5.463 * color) * gal->z
+ (-4.919 + 7.518 * color) * gal->z * gal->z
+ (-0.286 - 3.560 * color) * gal->z * gal->z * gal->z
+ (0.558 + 0.603 * color) * gal->z * gal->z * gal->z * gal->z));
idc = id;
}
gal->mag = -2.5 * log10(ib + idc);
}

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