Changeset 17557 for trunk/ppSim/src/ppSimStars.c

Timestamp:

May 7, 2008, 10:55:21 AM (18 years ago)

Author:

eugene

Message:

fix errors with star density normalizations and flux consistency

File:

• trunk/ppSim/src/ppSimStars.c (modified) (1 diff)

trunk/ppSim/src/ppSimStars.c

@@ -26 +26 @@
     return galaxy;
 }
+
+float ppSimStarSkyNoise (float skySigma, float seeingSigma) {
+
+    float skyNoise = skySigma * sqrt(4*M_PI*PS_SQR(seeingSigma));
+    return skyNoise;
+}
+
+float ppSimStarPeakToFlux (float peak, float seeingSigma) {
+
+    float psfArea = 2.0*M_PI*PS_SQR(seeingSigma);
+    float flux = peak * psfArea;
+    return flux;
+}
+
+float ppSimStarFluxToPeak (float flux, float seeingSigma) {
+
+    float psfArea = 2.0*M_PI*PS_SQR(seeingSigma);
+    float peak = flux / psfArea;
+    return peak;
+}
+
+float ppSimFluxToMag (float flux, float zp) {
+
+    float mag = -2.5*log10(flux) + zp;
+    return mag;
+}
+
+float ppSimMagToFlux (float mag, float zp) {
+
+    float flux = powf (10.0, -0.4*(mag - zp));
+    return flux;
+}