DESI will precisely constrain cosmic expansion and the growth of structure by collecting ∼35 million redshifts across ∼80% of cosmic history and one third of the sky to study Baryon Acoustic Oscillations (BAO) and Redshift Space Distortions (RSD). We present a preliminary target selection for an Emission Line Galaxy (ELG) sample, which will comprise about half of all DESI tracers. The selection consists of a g-band magnitude cut and a (g−r) vs. (r−z) color box, which we validate using HSC/PDR2 photometric redshifts and DEEP2 spectroscopy. The ELG target density should be ∼2400 deg−2, with ∼65% of ELG redshifts reliably within a redshift range of 0.6<z<1.6. ELG targeting for DESI will be finalized during a `Survey Validation' phase.
@article{arxiv.2010.11281,
title = {Preliminary Target Selection for the DESI Emission Line Galaxy (ELG) Sample},
author = {Anand Raichoor and Daniel J. Eisenstein and Tanveer Karim and Jeffrey A. Newman and John Moustakas and David D. Brooks and Kyle S. Dawson and Arjun Dey and Yutong Duan and Sarah Eftekharzadeh and Enrique Gaztañaga and Robert Kehoe and Martin Landriau and Dustin Lang and Jae H. Lee and Michael E. Levi and Aaron M. Meisner and Adam D. Myers and Nathalie Palanque-Delabrouille and Claire Poppett and Francisco Prada and Ashley J. Ross and David J. Schlegel and Michael Schubnell and Ryan Staten and Gregory Tarlé and Rita Tojeiro and Christophe Yèche and Rongpu Zhou},
journal= {arXiv preprint arXiv:2010.11281},
year = {2020}
}