Searching for galaxy clusters in SDSS and CFHT

A. Mints

November 27, 2013

Limitations of SDSS

Calibrating CFHT data

Calibrating CFHT data

Compare SDSS and CFHT on distant clusters

Why photoz?

Some catalogs (ALHAMBRA, CFHTLS) provide “good”photoz;

Might be easier to use cross matched data (with the newARCHES XMatch code);

Requires photoz-code to be used for other catalogs;

Requires SED calibrations;

No significant improvement in some cases;

Ali’s paper II data

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−(zi−z)2

2σ2z

b(z ,mi )