DOE OSTI · 3009991
ODIN: Probing the LAE Ly α Luminosity Function across Cosmic Time and Different Environments
Abstract
The ubiquity and relative ease of discovery make 2 ≲ z ≲ 5 Lyα emitting galaxies (LAEs) ideal tracers for large-scale structure of the distant Universe. In addition, because Lyα is a resonance line, but frequently observed at large equivalent width, it is potentially a probe of galaxy evolution. The LAE Lyα luminosity function (LF) is an essential measurement for making progress on both of these topics. 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 needed to rigorously compute the LAE LF, and test them on the ∼16,000 ODIN LAEs found in the extended COSMOS field. Using these limited samples, we find weak evidence that protocluster environments suppress the numbers of faint LAEs compared 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.
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Nagaraj, Gautam [Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland)] (ORCID:000000020905342X), Ciardullo, Robin [Pennsylvania State Univ., University Park, PA (United States)] (ORCID:0000000213280211), Gronwall, Caryl [Pennsylvania State Univ., University Park, PA (United States)] (ORCID:0000000168422371), Ramakrishnan, Vandana [Purdue Univ., West Lafayette, IN (United States)] (ORCID:0000000291767252), Lee, Kyoung-Soo [Purdue Univ., West Lafayette, IN (United States)] (ORCID:0000000330049596), Gawiser, Eric [Rutgers Univ., Piscataway, NJ (United States)] (ORCID:0000000315308713), Firestone, Nicole [Rutgers Univ., Piscataway, NJ (United States)] (ORCID:0000000298112443), Ramgopal, Govind [Rutgers Univ., Piscataway, NJ (United States)], Aguilar, J. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:000000030822452X), Ahlen, S. [Boston Univ., MA (United States)] (ORCID:0000000160987247), Bianchi, D. [Univ. degli Studi di Milano (Italy); Istituto Nazionale di Astrofisica (INAF) (Italy)] (ORCID:0000000197120006), Brooks, D. [Univ. College London (United Kingdom)] (ORCID:0000000284585047), Castander, F. J. [Institut d'Estudis Espacials de Catalunya (IEEC), Barcelona (Spain); Institute of Space Sciences, Barcelona (Spain)] (ORCID:0000000173164573), Claybaugh, T. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Cuceu, A. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], de la Macorra, A. [Univ. Nacional Autonoma de Mexico (UNAM), Mexico City (Mexico)] (ORCID:0000000217691640), Dey, Arjun [National Optical-Infrared Astronomy Research Laboratory (NOIRLab), Tucson, AZ (United States)] (ORCID:0000000249284003), Dey, Biprateep [Univ. of Toronto, ON (Canada); Univ. of Pittsburgh, PA (United States)] (ORCID:0000000256657912), Doel, P. [Univ. College London (United Kingdom)] (ORCID:0000000263974457), Forero-Romero, J. E. [Univ. of the Andes (Colombia)] (ORCID:0000000228903725), Gaztañaga, E. [Institut d'Estudis Espacials de Catalunya (IEEC), Barcelona (Spain); Institute of Space Sciences, Barcelona (Spain); Univ. of Portsmouth (United Kingdom)] (ORCID:0000000196320815), Gontcho A Gontcho, S. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of Virginia, Charlottesville, VA (United States)], Gutierrez, G. [Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)] (ORCID:0000000308250517), Herrera-Alcantar, H. K. [Inst. d’Astrophysique de Paris (France); Univ. Paris-Saclay, Gif-sur-Yvette (France)] (ORCID:0000000291369609), Honscheid, K. [The Ohio State Univ., Columbus, OH (United States)], Ishak, M. [Univ. of Texas at Dallas, Richardson, TX (United States)] (ORCID:000000026024466X), Kehoe, R. [Southern Methodist Univ., Dallas, TX (United States)] (ORCID:000000027101697X), Kirkby, D. [Univ. of California, Irvine, CA (United States)] (ORCID:0000000288285463), Kisner, T. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000335107134), Kremin, A. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000163567424), Landriau, M. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000318388528), Le Guillou, L. [Sorbonne Univ., Paris (France)] (ORCID:0000000171788868), Levi, M. E. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000318871018), Magneville, C. [Univ. Paris-Saclay, Gif-sur-Yvette (France)], Manera, M. [Univ. Autonoma de Barcelona (Spain). Inst. de Fisica d'Altes Energies (IFAE)] (ORCID:0000000349628934), Martini, P. [The Ohio State Univ., Columbus, OH (United States)] (ORCID:0000000201944017), Meisner, A. [National Optical-Infrared Astronomy Research Laboratory (NOIRLab), Tucson, AZ (United States)] (ORCID:0000000211257384), Miquel, R. [Univ. Autonoma de Barcelona (Spain). Inst. Catalana de Recerca i Estudis Avancats (ICREA) and Inst. de Fisica d'Altes Energies (IFAE)] (ORCID:0000000266104836), Moustakas, J. [Siena College, Loudonville, NY (United States)] (ORCID:0000000227334559), Palanque-Delabrouille, N. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. Paris-Saclay, Gif-sur-Yvette (France)], Prada, F. [Spanish National Research Council (CSIC) (Spain)], Pérez-Ràfols, I. [Univ. Politecnica de Catalunya (Spain)] (ORCID:0000000169790125), Rossi, G. [Sejong Univ., Seoul (Korea, Republic of)], Samushia, L. [Abastumani Astrophysical Observatory (Georgia); Kansas State Univ., Manhattan, KS (United States); Ilia State Univ. (Georgia)] (ORCID:0000000216095687), Sanchez, E. [Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain)] (ORCID:0000000296468198), Schlegel, D. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000250425088), Schubnell, M. [Univ. of Michigan, Ann Arbor, MI (United States)], Seo, H. [Ohio Univ., Athens, OH (United States)] (ORCID:0000000265883508), Silber, J. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000234610320), Sprayberry, D. [National Optical-Infrared Astronomy Research Laboratory (NOIRLab), Tucson, AZ (United States)] (ORCID:0000000175836441), Tarlé, G. [Univ. of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000317040781), Valdes, F. [National Optical-Infrared Astronomy Research Laboratory (NOIRLab), Tucson, AZ (United States)] (ORCID:0000000155671301), Weaver, B. A. [National Optical-Infrared Astronomy Research Laboratory (NOIRLab), Tucson, AZ (United States)], White, M. [University of California, Berkeley, CA (United States)] (ORCID:0000000199125070), Zhou, R. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000153814372), Zou, H. [Chinese Academy of Sciences (CAS), Beijing (China)] (ORCID:0000000266843997). 2025-12-10. ODIN: Probing the LAE Ly α Luminosity Function across Cosmic Time and Different Environments. https://doi.org/10.3847/1538-4357%2Fae1969
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