Preliminary Target Selection for the DESI Emission Line Galaxy (ELG) Sample
Anand Raichoor, Daniel J. Eisenstein, Tanveer Karim, Jeffrey A., Newman, John Moustakas, David D. Brooks, Kyle S. Dawson, Arjun Dey, Yutong, Duan, Sarah Eftekharzadeh, Enrique Gazta\~naga, Robert Kehoe, Martin, Landriau, Dustin Lang, Jae H. Lee, Michael E. Levi, Aaron M. Meisner

TL;DR
This paper details a preliminary method for selecting Emission Line Galaxy targets for DESI, aiming to optimize redshift measurements crucial for understanding cosmic expansion and structure growth.
Contribution
It introduces a specific color and magnitude-based selection method for ELGs, validated with existing photometric and spectroscopic data, to improve target efficiency for DESI.
Findings
ELG target density estimated at ~2400 per square degree.
Approximately 65% of ELGs will have reliable redshifts within 0.6<z<1.6.
Selection method validated with HSC/PDR2 and DEEP2 data.
Abstract
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 -band magnitude cut and a vs. color box, which we validate using HSC/PDR2 photometric redshifts and DEEP2 spectroscopy. The ELG target density should be 2400 deg, with 65% of ELG redshifts reliably within a redshift range of . ELG targeting for DESI will be finalized during a `Survey Validation' phase.
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