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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2603.09905 |
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| author | 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 |
| author_facet | 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 |
| 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_09905 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | ODIN: Spectroscopic Validation of Ly$α$-Emitting Galaxy Samples with DESI 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 Astrophysics of Galaxies 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. |
| title | ODIN: Spectroscopic Validation of Ly$α$-Emitting Galaxy Samples with DESI |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2603.09905 |