Preliminary Target Selection for the DESI Emission Line Galaxy (ELG) Sample
Raichoor, Anand, Eisenstein, Daniel J, Karim, Tanveer, Newman, Jeffrey A, Moustakas, John, Brooks, David D, Dawson, Kyle S, Dey, Arjun, Duan, Yutong, Eftekharzadeh, Sarah, Gaztañaga, Enrique, Kehoe, Robert, Landriau, Martin, Lang, Dustin, Lee, Jae H, Levi, Michael E, Meisner, Aaron M, Myers, Adam D, Palanque-Delabrouille, Nathalie, Poppett, Claire, Prada, Francisco, Ross, Ashley J, Schlegel, David J, Schubnell, Michael, Staten, Ryan, Tarlé, Gregory, Tojeiro, Rita, Yèche, Christophe, Zhou, Rongpu
Abstract
DESI will precisely constrain cosmic expansion and the growth of structure by\ncollecting $\\sim$35 million redshifts across $\\sim$80% of cosmic history and\none third of the sky to study Baryon Acoustic Oscillations (BAO) and Redshift\nSpace Distortions (RSD). We present a preliminary target selection for an\nEmission Line Galaxy (ELG) sample, which will comprise about half of all DESI\ntracers. The selection consists of a $g$-band magnitude cut and a $(g-r)$ vs.\n$(r-z)$ color box, which we validate using HSC/PDR2 photometric redshifts and\nDEEP2 spectroscopy. The ELG target density should be $\\sim$2400 deg$^{-2}$,\nwith $\\sim$65% of ELG redshifts reliably within a redshift range of\n$0.6