redMaGiC: Selecting Luminous Red Galaxies from the DES Science Verification Data

Abstract

We introduce redMaGiC, an automated algorithm for selecting Luminous Red Galaxies (LRGs). The algorithm was specifically developed to minimize photometric redshift uncertainties in photometric large-scale structure studies. redMaGiC achieves this by self-training the color-cuts necessary to produce a luminosity-thresholded LRG sample of constant comoving density. We demonstrate that redMaGiC photozs are very nearly as accurate as the best machine-learning based methods, yet they require minimal spectroscopic training, do not suffer from extrapolation biases, and are very nearly Gaussian. We apply our algorithm to Dark Energy Survey (DES) Science Verification (SV) data to produce a redMaGiC catalog sampling the redshift range $z\in [0.2,0.8]$. Our fiducial sample has a comoving space density of $10^{-3}(h^{-1}Mpc{)}^{-3}$, and a median photoz bias ($z_{spec}-z_{photo}$) and scatter $({\sigma }_z/(1+z))$ of 0.005 and 0.017 respectively. The corresponding $5\sigma$ outlier fraction is 1.4%. We also test our algorithm with Sloan Digital Sky Survey (SDSS) Data Release 8 (DR8) and Stripe 82 data, and discuss how spectroscopic training can be used to control photoz biases at the 0.1% level.

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References in corpus (12)

• K-corrections and filter transformations in the ultraviolet, optical, and near infrared
• Astrophysics Source Code Library
• The Dark Energy Camera
• Galaxy Clusters Discovered via the Sunyaev-Zel'dovich Effect in the 2500-square-degree SPT-SZ survey
• The redMaPPer Galaxy Cluster Catalog From DES Science Verification Data
• The Blanco Cosmology Survey: Data Acquisition, Processing, Calibration, Quality Diagnostics and Data Release
• The DES Science Verification Weak Lensing Shear Catalogues
• Photometric redshift analysis in the Dark Energy Survey Science Verification data
• The Vimos VLT Deep Survey: Global properties of 20000 galaxies in the I_AB<=22.5 WIDE survey
• OzDES multi-fibre spectroscopy for the Dark Energy Survey: first-year operation and results
• Feature importance for machine learning redshifts applied to SDSS galaxies
• Data augmentation for machine learning redshifts applied to SDSS galaxies

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