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2012MNRAS.420.3240N - Mon. Not. R. Astron. Soc., 420, 3240-3263 (2012/March-2)
Photometric redshift requirements for lens galaxies in galaxy–galaxy lensing analyses.
NAKAJIMA R., MANDELBAUM R., SELJAK U., COHN J.D., REYES R. and COOL R.
Abstract (from CDS):
For the SDSS DR8 catalogue, we find σ_Δz/(1+z)_= 0.096 and 0.113 for the lens and source catalogues, with flux limits of r= 21 and 21.8, respectively. The photo-z bias and scatter is a function of photo-z and template types, which we exploit to apply photo-z quality cuts. By using photo-z rather than spectroscopy for lenses, dim blue galaxies and L* galaxies up to z ∼ 0.4 can be used as lenses, thus expanding into unexplored areas of parameter space. We also explore the systematic uncertainty in the lensing signal calibration when using source photo-z, and both lens and source photo-z; given the size of existing training samples, we can constrain the lensing signal calibration (and therefore the normalization of the surface mass density) to within 2 and 4 per cent, respectively.
Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS
Journal keyword(s): gravitational lensing: weak - methods: data analysis - galaxies: distances and redshifts - cosmology: observations
Simbad objects: 2
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