TY - JOUR
T1 - ODIN
T2 - Improved Narrowband Lyα Emitter Selection Techniques for z = 2.4, 3.1, and 4.5
AU - Firestone, Nicole M.
AU - Gawiser, Eric
AU - Ramakrishnan, Vandana
AU - Lee, Kyoung Soo
AU - Valdes, Francisco
AU - Park, Changbom
AU - Yang, Yujin
AU - Ciardullo, Robin
AU - Artale, María Celeste
AU - Benda, Barbara
AU - Broussard, Adam
AU - Eid, Lana
AU - Farooq, Rameen
AU - Gronwall, Caryl
AU - Guaita, Lucia
AU - Gwyn, Stephen
AU - Hwang, Ho Seong
AU - Im, Sang Hyeok
AU - Jeong, Woong Seob
AU - Karthikeyan, Shreya
AU - Lang, Dustin
AU - Moon, Byeongha
AU - Padilla, Nelson
AU - Sawicki, Marcin
AU - Seo, Eunsuk
AU - Singh, Akriti
AU - Song, Hyunmi
AU - Iribarren, Paulina Troncoso
N1 - Publisher Copyright:
© 2024. The Author(s). Published by the American Astronomical Society.
PY - 2024/10/1
Y1 - 2024/10/1
N2 - 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 Lyα 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-deg2 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 Lyα 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 deg2). 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 Lyα 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.
AB - 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 Lyα 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-deg2 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 Lyα 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 deg2). 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 Lyα 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.
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U2 - 10.3847/1538-4357/ad71c9
DO - 10.3847/1538-4357/ad71c9
M3 - Article
AN - SCOPUS:85207365497
SN - 0004-637X
VL - 974
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 217
ER -