摘要：The Sloan Digital Sky Survey IV extended Baryonic Oscillation Spectroscopic Survey
(SDSS-IV/eBOSS) will observe 195 000 emission-line galaxies (ELGs) to measure the baryonic
acoustic oscillation (BAO) standard ruler at redshift 0.9. To test different ELG selection
algorithms, 9000 spectra were observed with the SDSS spectrograph as a pilot survey based
on data from several imaging surveys. First, using visual inspection and redshift quality
flags, we show that the automated spectroscopic redshifts assigned by the pipeline meet
the quality requirements for a reliable BAO measurement. We also show the correlations
between sky emission, signal-to-noise ratio in the emission lines, and redshift error.
Then we provide a detailed description of each target selection algorithm we tested and
compare them with the requirements of the eBOSS experiment. As a result, we provide
reliable redshift distributions for the different target selection schemes we tested.
Finally, we determine an target selection algorithms that is best suited to be applied on
DECam photometry because they fulfill the eBOSS survey efficiency requirements.
关键词：large-scale structure of Universe;galaxies: general;methods: observational
