The document discusses calibrating data from the Canada-France-Hawaii Telescope (CFHT) survey and comparing it to data from the Sloan Digital Sky Survey (SDSS) to search for distant galaxy clusters. It notes some limitations of SDSS data and the need to calibrate CFHT data, including using photo-z codes and spectral energy distribution calibrations. It also compares using photo-z versus redshift-color modeling for cluster finding.

1. Searching for galaxy clusters in SDSS and CFHT
A. Mints
November 27, 2013

2. Limitations of SDSS

3. Calibrating CFHT data

4. Calibrating CFHT data

5. Compare SDSS and CFHT on distant clusters

6. Why photoz?
Some catalogs (ALHAMBRA, CFHTLS) provide “good”
photoz;
Might be easier to use cross matched data (with the new
ARCHES XMatch code);
Requires photoz-code to be used for other catalogs;
Requires SED calibrations;
No significant improvement in some cases;

7. Ali’s paper II data

8. PhotoZ vs Redshift-color
λ(z) =
λ(z)u(z, x)
λ(z)u(z, x) + b(z, x)
uredmapper = ρ(r )L(mi )C (z, c)
b(z, c, mi )
uphotoz = ρ(r )e
b(z, mi )
−(zi −z)2
2
2σz