ODIN: Improved Narrowband Lyα Emitter Selection Techniques for z = 2.4, 3.1, and 4.5

Abstract Lyman-alpha-emitting galaxies (LAEs) are typically young, low-mass, star-forming galaxies with little extinction from interstellar dust. Their low dust attenuation allows their Ly α emission to shine brightly in spectroscopic and photometric observations, providing an observational window into the high-redshift Universe. Narrowband surveys reveal large, uniform samples of LAEs at specific redshifts that probe large-scale structure and the temporal evolution of galaxy properties. The One-hundred-deg 2 DECam Imaging in Narrowbands (ODIN) utilizes three custom-made narrowband filters on the Dark Energy Camera (DECam) to discover LAEs at three equally spaced periods in cosmological history. In this paper, we introduce the hybrid-weighted double-broadband continuum estimation technique, which yields improved estimation of Ly α equivalent widths. Using this method, we discover 6032, 5691, and 4066 LAE candidates at z = 2.4, 3.1, and 4.5 in the extended COSMOS field (∼9 deg 2 ). We find that [O ii ] emitters are a minimal contaminant in our LAE samples, but that interloping Green Pea–like [O iii ] emitters are important for our redshift 4.5 sample. We introduce an innovative method for identifying [O ii ] and [O iii ] emitters via a combination of narrowband excess and galaxy colors, enabling their study as separate classes of objects. We present scaled median stacked spectral energy distributions for each galaxy sample, revealing the overall success of our selection methods. We also calculate rest-frame Ly α equivalent widths for our LAE samples and find that the EW distributions are best fit by exponential functions with scale lengths of w 0 = 53 ± 1, 65 ± 1, and 59 ± 1 Å, respectively.

Authors

Publication Details

Journal
The Astrophysical Journal
Published
2024-10-01
DOI
https://doi.org/10.3847/1538-4357/ad71c9
Citations
11
Primary Topic
Radio Frequency Integrated Circuit Design
Type
article
Field-Weighted Citation Impact
2.30

Funders

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article

ODIN: Improved Narrowband Lyα Emitter Selection Techniques for z = 2.4, 3.1, and 4.5

Dustin Lang, Byeongha Moon, Robin Ciardullo, P. Troncoso et al.
11 citations
The Astrophysical Journal
Radio Frequency Integrated Circuit Design
2.30
article

ODIN: Improved Narrowband Lyα Emitter Selection Techniques for z = 2.4, 3.1, and 4.5

Dustin Lang, Byeongha Moon, Robin Ciardullo, P. Troncoso, L. Guaita, Yujin Yang, Vandana Ramakrishnan, Stephen Gwyn, F. Valdés, Barbara Benda, Woong-Seob Jeong, Adam Broussard, Changbom Park, Nelson Padilla, M. Celeste Artale, Ho Seong Hwang, Shreya Karthikeyan, Marcin Sawicki, Nicole Firestone, Rameen Farooq, Kyoung-Soo Lee, Sang Hyeok Im, Eric Gawiser, C. Gronwall, Hyunmi Song, Lana Eid, Akriti Singh, Eunsuk Seo
article en
11 citations

Abstract

Abstract Lyman-alpha-emitting galaxies (LAEs) are typically young, low-mass, star-forming galaxies with little extinction from interstellar dust. Their low dust attenuation allows their Ly α emission to shine brightly in spectroscopic and photometric observations, providing an observational window into the high-redshift Universe. Narrowband surveys reveal large, uniform samples of LAEs at specific redshifts that probe large-scale structure and the temporal evolution of galaxy properties. The One-hundred-deg 2 DECam Imaging in Narrowbands (ODIN) utilizes three custom-made narrowband filters on the Dark Energy Camera (DECam) to discover LAEs at three equally spaced periods in cosmological history. In this paper, we introduce the hybrid-weighted double-broadband continuum estimation technique, which yields improved estimation of Ly α equivalent widths. Using this method, we discover 6032, 5691, and 4066 LAE candidates at z = 2.4, 3.1, and 4.5 in the extended COSMOS field (∼9 deg 2 ). We find that [O ii ] emitters are a minimal contaminant in our LAE samples, but that interloping Green Pea–like [O iii ] emitters are important for our redshift 4.5 sample. We introduce an innovative method for identifying [O ii ] and [O iii ] emitters via a combination of narrowband excess and galaxy colors, enabling their study as separate classes of objects. We present scaled median stacked spectral energy distributions for each galaxy sample, revealing the overall success of our selection methods. We also calculate rest-frame Ly α equivalent widths for our LAE samples and find that the EW distributions are best fit by exponential functions with scale lengths of w 0 = 53 ± 1, 65 ± 1, and 59 ± 1 Å, respectively.

The Astrophysical JournalVol. 974(2)
National Science Foundation, National Aeronautics and Space Administration, National Research Foundation of Korea
Affordable and clean energy
Openalex Percentile: Top 11%
Radio Frequency Integrated Circuit Design
2.30
DOIOpen Access PDFOpenAlex
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