Multiple image catalog
1. Sextractor - find all fain point, especially those close to other bright cluster members.
2. Report ISO magnitudes, in the defaul.para you should have the following:
NUMBER
X_WORLD
Y_WORLD
MAG_ISO
MAGERR_ISO
FLAGS
CLASS_STAR
3. Remove all stars using class_star with number 1.0-0.9
4. Remove all objects with FLAGS above 8, for removing hot pixels, obejct on the edge on the frame, etc.
5. Find cluster members using red sequence V plotted over V-I or V-Z
6. Extract those members form the list
7. Produce the region file where all the multiple images can be created, using the LENSTOOL
cline
nplan 1 8.
zonemult 1 3000 zonemult.output
dmax 75.000
algorithm SNAKE
pas 3.000
end
1. Produce an amplification map, or a mass map, with the same parameters
2. Copy the wcs from this amplification map to the zonemult map
3. Plot contours at zonemult=3 in ds9, to get all the multiples >=3 times
4. Save it as a region file in wcs
8. Use only objects that are within the field.
9. Use hyperz to check their possible redshift and remove those objects that are surely on too low redshift.
10. Divide the objects in some small redshift bins - analyze bin by bin checking which objects within the redshift bin have also identical color.