ODIN: The LAE Lyα Luminosity Function over Cosmic Time and Environmental Density
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| Natura: | Preprint |
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2025
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| author | Nagaraj, Gautam Ciardullo, Robin Gronwall, Caryl Ramakrishnan, Vandana Lee, Kyoung-Soo Gawiser, Eric Firestone, Nicole M. Ramgopal, Govind Aguilar, J. Ahlen, Steven Bianchi, Davide Brooks, David Castander, Francisco Javier Claybaugh, Todd Cuceu, Andrei de la Macorra, Axel Dey, Arjun Dey, Biprateep Doel, Peter Forero-Romero, Jaime Gaztanaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Herrera-Alcantar, Hiram K. Honscheid, Klaus Ishak, Mustapha Kehoe, Robert Kirkby, David Kisner, T. Kremin, Anthony Landriau, Martin Guillou, Laurent Le Levi, Michael Magneville, Christophe Manera, Marc Martini, Paul Meisner, Aaron M. Miquel, Ramon Moustakas, John Palanque-Delabrouille, Nathalie Prada, Francisco Perez-Rafols, Ignasi Rossi, Graziano Samushia, Lado Sanchez, Eusebio Schlegel, David J. Schubnell, Michael F. Seo, Hee-Jong Silber, Joseph H. Sprayberry, David Tarle, Gregory Valdes, Francisco Weaver, Benjamin A. White, Martin Zhou, Rongpu Zou, Hu |
| author_facet | Nagaraj, Gautam Ciardullo, Robin Gronwall, Caryl Ramakrishnan, Vandana Lee, Kyoung-Soo Gawiser, Eric Firestone, Nicole M. Ramgopal, Govind Aguilar, J. Ahlen, Steven Bianchi, Davide Brooks, David Castander, Francisco Javier Claybaugh, Todd Cuceu, Andrei de la Macorra, Axel Dey, Arjun Dey, Biprateep Doel, Peter Forero-Romero, Jaime Gaztanaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Herrera-Alcantar, Hiram K. Honscheid, Klaus Ishak, Mustapha Kehoe, Robert Kirkby, David Kisner, T. Kremin, Anthony Landriau, Martin Guillou, Laurent Le Levi, Michael Magneville, Christophe Manera, Marc Martini, Paul Meisner, Aaron M. Miquel, Ramon Moustakas, John Palanque-Delabrouille, Nathalie Prada, Francisco Perez-Rafols, Ignasi Rossi, Graziano Samushia, Lado Sanchez, Eusebio Schlegel, David J. Schubnell, Michael F. Seo, Hee-Jong Silber, Joseph H. Sprayberry, David Tarle, Gregory Valdes, Francisco Weaver, Benjamin A. White, Martin Zhou, Rongpu Zou, Hu |
| contents | The ubiquity and relative ease of discovery make $2\lesssim z\lesssim 5$ Ly$α$ emitting galaxies (LAEs) ideal tracers for cosmology. In addition, because Ly$α$ is a resonance line, but frequently observed at large equivalent width, it is potentially a probe of galaxy evolution. The LAE Ly$α$ luminosity function (LF) is an essential measurement for making progress on both of these aspects. Although several studies have computed the LAE LF, very few have delved into how the function varies with environment. The large area and depth of the One-hundred-deg$^2$ DECam Imaging in Narrowbands (ODIN) survey makes such measurements possible at the cosmic noon redshifts of z~2.4, ~3.1, and ~4.5. In this initial work, we present algorithms to rigorously compute the LAE LF and test our methods on the ~16,000 ODIN LAEs found in the extended COSMOS field. Using these limited samples, we find slight evidence that protocluster environments either suppress the numbers of very faint and very bright LAEs or enhance medium-bright LAEs in comparison to the field. We also find that the LF decreases in number density and evolves towards a steeper faint-end slope over cosmic time from z~4.5 to z~2.4. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_14510 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | ODIN: The LAE Lyα Luminosity Function over Cosmic Time and Environmental Density Nagaraj, Gautam Ciardullo, Robin Gronwall, Caryl Ramakrishnan, Vandana Lee, Kyoung-Soo Gawiser, Eric Firestone, Nicole M. Ramgopal, Govind Aguilar, J. Ahlen, Steven Bianchi, Davide Brooks, David Castander, Francisco Javier Claybaugh, Todd Cuceu, Andrei de la Macorra, Axel Dey, Arjun Dey, Biprateep Doel, Peter Forero-Romero, Jaime Gaztanaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Herrera-Alcantar, Hiram K. Honscheid, Klaus Ishak, Mustapha Kehoe, Robert Kirkby, David Kisner, T. Kremin, Anthony Landriau, Martin Guillou, Laurent Le Levi, Michael Magneville, Christophe Manera, Marc Martini, Paul Meisner, Aaron M. Miquel, Ramon Moustakas, John Palanque-Delabrouille, Nathalie Prada, Francisco Perez-Rafols, Ignasi Rossi, Graziano Samushia, Lado Sanchez, Eusebio Schlegel, David J. Schubnell, Michael F. Seo, Hee-Jong Silber, Joseph H. Sprayberry, David Tarle, Gregory Valdes, Francisco Weaver, Benjamin A. White, Martin Zhou, Rongpu Zou, Hu Astrophysics of Galaxies The ubiquity and relative ease of discovery make $2\lesssim z\lesssim 5$ Ly$α$ emitting galaxies (LAEs) ideal tracers for cosmology. In addition, because Ly$α$ is a resonance line, but frequently observed at large equivalent width, it is potentially a probe of galaxy evolution. The LAE Ly$α$ luminosity function (LF) is an essential measurement for making progress on both of these aspects. Although several studies have computed the LAE LF, very few have delved into how the function varies with environment. The large area and depth of the One-hundred-deg$^2$ DECam Imaging in Narrowbands (ODIN) survey makes such measurements possible at the cosmic noon redshifts of z~2.4, ~3.1, and ~4.5. In this initial work, we present algorithms to rigorously compute the LAE LF and test our methods on the ~16,000 ODIN LAEs found in the extended COSMOS field. Using these limited samples, we find slight evidence that protocluster environments either suppress the numbers of very faint and very bright LAEs or enhance medium-bright LAEs in comparison to the field. We also find that the LF decreases in number density and evolves towards a steeper faint-end slope over cosmic time from z~4.5 to z~2.4. |
| title | ODIN: The LAE Lyα Luminosity Function over Cosmic Time and Environmental Density |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2506.14510 |