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Preliminary Target Selection for the DESI Emission Line Galaxy (ELG) Sample

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arxiv 2010.11281 v1 pith:HNB7UQBS submitted 2020-10-21 astro-ph.CO

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
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Yutong Duan Sarah Eftekharzadeh Enrique Gazta\~naga Robert Kehoe Martin Landriau Dustin Lang Jae H. Lee Michael E. Levi Aaron M. Meisner Adam D. Myers Nathalie Palanque-Delabrouille Claire Poppett Francisco Prada Ashley J. Ross David J. Schlegel Michael Schubnell Ryan Staten Gregory Tarl\'e Rita Tojeiro Christophe Y\`eche Rongpu Zhou
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DESI will precisely constrain cosmic expansion and the growth of structure by collecting $\sim$35 million redshifts across $\sim$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 $\sim$2400 deg$^{-2}$, with $\sim$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.

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