Analysing real astronomical data with KSBf90:

The IAP DUEL weak lensing summer school 2009 will be hosting a KSBf90 practical session.  What follows are the instructions for the students who will be analysing a section of the CFHTLS D1 field.

The weak lensing analysis consists of six steps

1. 1)Install KSB90 for astronomers
   

2. 2)Create SExtractor catalogue (see Thomas Erbens catalogue practical)
   

3. 3)Separate the stars from the galaxies 
   

4. 4)Measure and model the PSF
   

5. 5)Measure and correct the galaxy shapes
   

6. 6)Select galaxies for shear measurement
   

7. 7)Create a mass map
   

Note for any of the code, you can always use the option ‘-h’ to see what command line input is expected.

Page maintained by Catherine Heymans, IfA, University of Edinburgh