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 standard ruler (BAO) at redshift 0.9. To test different ELG selection algorithms, 9,000 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.
@article{arxiv.1509.05045,
title = {SDSS-IV eBOSS emission-line galaxy pilot survey},
author = {J. Comparat and T. Delubac and S. Jouvel and A. Raichoor and J-P. Kneib and C. Yeche and F. B. Abdalla and C. Le Cras and C. Maraston and D. M. Wilkinson and G. Zhu and E. Jullo and F. Prada and D. Schlegel and Z. Xu and H. Zou and J. Bautista and D. Bizyaev and A. Bolton and J. R. Brownstein and K. S. Dawson and S. Escoffier P. Gaulme and K. Kinemuchi and E. Malanushenko and V. Malanushenko and V. Mariappan and J. A. Newman and D. Oravetz and K. Pan and W. J. Percival and A. Prakash and D. P. Schneider and A. Simmons and T. M. C. Abbott S. Allam and M. Banerji and A. Benoit-Lévy and E. Bertin and D. Brooks and D. Capozzi and A. Carnero Rosell and M. Carrasco Kind and J. Carretero and F. J. Castander and C. E. Cunha and L. N. da Costa and S. Desai and P. Doel and T. F. Eifler and J. Estrada and B. Flaugher and P. Fosalba and J. Frieman and E. Gaztanaga and D. W. Gerdes and D. Gruen and R. A. Gruendl and G. Gutierrez and K. Honscheid and D. J. James and K. Kuehn and N. Kuropatkin and O. Lahav and M. Lima and M. A. G. Maia and M. March and J. L. Marshall and R. Miquel and A. A. Plazas and K. Reil and N. Roe and A. K. Romer and A. Roodman and E. S. Rykoff and M. Sako and E. Sanchez and V. Scarpine and I. Sevilla-Noarbe and M. Soares-Santos and F. Sobreira and E. Suchyta and M. E. C. Swanson and G. Tarle and J. Thaler and D. Thomas and A. R. Walker and Y. Zhang},
journal= {arXiv preprint arXiv:1509.05045},
year = {2016}
}