Photometric Redshifts for Cosmology, Lensing, and Euclid
The main difference between spectroscopic and photometric redshifts is the precision and statistical robustness of the resulting measurement. There are well established methods for determining the accuracy and precision of spectroscopic redshifts, but similar quantification has proven difficult for photometric redshifts. For cosmological applications we must have a statsitically robost estimate of the galaxy redsift distribution which current photometric redhsift codes do not provide. I am developing a robust anayltic approach to photometric redshifts aiming to overcome this limitation.
Leauthaud...Capak et al. 2012
Salvato...Capak et al. 20011
Ilbert...Capak et al. 2009
Massey...Capak et al. 2007
The PHAT project
The PHAT project aims to provide a quantitative set of tests for Photometric Redshifts similar to the STEP program for gravitational lensing. We have conducted two challenge rounds that compare different photo-z methods and provide quantiative comparisons between the two.
Hildebrandt...Capak et al. 2010