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We present a new selection technique of producing spectroscopic targetcatalogues for massive spectroscopic surveys for cosmology. This work wasconducted in the context of the extended Baryon Oscillation SpectroscopicSurvey (eBOSS), which will use ~200 000 emission line galaxies (ELGs) at0.6<zspec<1.0 to obtain a precise baryon acoustic oscillation measurement. Ourproposed selection technique is based on optical and near-infrared broad-bandfilter photometry. We used a training sample to define a quantity, the Fisherdiscriminant (linear combination of colours), which correlates best with thedesired properties of the target: redshift and [OII] flux. The proposedselections are simply done by applying a cut on magnitudes and this Fisherdiscriminant. We used public data and dedicated SDSS spectroscopy to quantifythe redshift distribution and [OII] flux of our ELG target selections. Wedemonstrate that two of our selections fulfil the initial eBOSS/ELG redshiftrequirements: for a target density of 180 deg^2, ~70% of the selected objectshave 0.6<zspec<1.0 and only ~1% of those galaxies in the range 0.6<zspec<1.0are expected to have a catastrophic zspec estimate. Additionally, the stackedspectra and stacked deep images for those two selections show characteristicfeatures of star-forming galaxies. The proposed approach using the Fisherdiscriminant could, however, be used to efficiently select other galaxypopulations, based on multi-band photometry, providing that spectroscopicinformation is available. This technique could thus be useful for other futuremassive spectroscopic surveys such as PFS, DESI, and 4MOST.

The SDSS-IV extended Baryon Oscillation Spectroscopic Survey: selecting emission line galaxies using the Fisher discriminant