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Main Authors: Pinarski, Ethan, Ramgopal, Govind, Firestone, Nicole, Lee, Kyoung-Soo, Gawiser, Eric, Dey, Arjun, Raichoor, A., Valdes, Francisco, Ciardullo, Robin, Aguilar, Jessica N., Ahlen, S., Bianchi, D., Brooks, D., Castander, F. J., Cerdosino, M. Candela, Claybaugh, T., Cuceu, A., Dawson, K. S., de la Macorra, A., Doel, P., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. Gontcho A, Guaita, Lucia, Gutierrez, G., Gwyn, Stephen, Herrera-Alcantar, H. K., Hwang, Ho Seong, Joyce, R., Juneau, S., Kehoe, R., Kirkby, D., Kisner, T., Kremin, A., Kumar, Ankit, Lamman, C., Landriau, M., Guillou, L. Le, Levi, M. E., Luo, Yufeng, Manera, M., Martini, P., Meisner, A., Miquel, R., Moustakas, J., Myers, A. D., Nadathur, S., Nagaraj, Gautam R., Palanque-Delabrouille, N., Park, Changbom, Percival, W. J., Pérez-Ràfols, I., Prada, F., Rossi, G., Sanchez, E., Sawicki, Marcin, Schlegel, D., Schubnell, M., Silber, J., Song, Hyunmi, Sprayberry, D., Tarlé, G., Iribarren, Paulina Troncoso, Weaver, B. A., Yang, Yujin, Zabludoff, Ann
Format: Preprint
Published: 2026
Subjects:
Astrophysics of Galaxies
Online Access:https://arxiv.org/abs/2603.09905
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Table of Contents:
  • The One-hundred-deg^2 DECam Imaging in Narrowbands (ODIN) survey is conducting the widest-field deep narrow-band imaging of the equatorial and southern skies. ODIN uses three custom-built narrow-band (NB) filters that sample Lya-emitting galaxies (LAEs) within thin cosmic slices centered at z=2.4, 3.1, and 4.5. In this work, we utilize extensive DESI spectroscopy of ODIN-selected galaxies in the COSMOS and XMM-LSS fields to validate our LAE selection. 2-4 hr exposures with DESI yielded redshift confirmation of 3,075 ODIN LAE candidates with NB magnitudes brighter than 26~mag. Restricting to objects that yield high-confidence redshifts, the confirmation rates are (93, 96, 92)% at z=(2.4, 3.1, 4.5). The primary contaminants consist of active galactic nuclei at the expected Lya redshift range and lower redshifts (C IV, C III]), with the remainder being star-forming galaxies ([O II] and [O III]). We find minimal contamination from [O II] emitters in our sample (<~1%), implying that our REW>20 A narrow-band excess photometry requirement is sufficient to remove them.

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