Monday.
1504.06328
Luminous red galaxies: selection and classification by combining optical and infrared photometry
Prakash, Licquia, Newman, Rao
A new method of combining optical and IR photometry to select LRGs at z>0.6. Combine optical photometry from CFHTLS and HST, IR photometry from WISE, and spectroscopic or photometry z from the DEEP2 Galaxy redshift survey or COSMOS. Present a variety of methods for testing the success of the selection, and present methods for optimization given a set of rest-frame color and z requirements. Tested this selection in two different regions of the sky, the COSMOS and EGS fields, to reduce the effect of cosmic/sample variance. Used these methods to assemble large samples of LRGs for 2 different ancillary programs as a part of the SDSS-III/BOSS spectroscopic survey. This technique is now being used to select ~600k LRG targets for eBOSS, which began observations in fall 2014, and will be adapted for the proposed DESI survey. Found these methods can select high-z LRGs efficiently with minimal stellar contamination; this is extremely difficult to achieve with selection that rely on optical photometry alone.
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