TY - JOUR
T1 - ODIN
T2 - Searching for LyC Emission from Lyα Emitters at z = 4.5 in the E-COSMOS and XMM-LSS Fields
AU - Seo, Eunsuk
AU - Song, Hyunmi
AU - Guaita, Lucia
AU - Lee, Kyoung Soo
AU - Gawiser, Eric
AU - Ciardullo, Robin
AU - Dey, Arjun
AU - Chang, Seok Jun
AU - Firestone, Nicole
AU - Gwyn, Stephen
AU - Hwang, Ho Seong
AU - Hong, Sungryong
AU - Im, Sang Hyeok
AU - Jeong, Woong Seob
AU - Lee, Jaehyun
AU - Lee, Seong Kook
AU - Park, Chanbom
AU - Ramakrishnan, Vandana
AU - Sawicki, Marcin
AU - Yang, Yujin
AU - Zabludoff, Ann
N1 - Publisher Copyright:
© 2026. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the https://creativecommons.org/licenses/by/4.0/. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
PY - 2026/4/20
Y1 - 2026/4/20
N2 - We investigated Lyman-continuum (LyC) emission from Lyman-alpha emitters (LAEs) at z = 4.5, identified in the One-hundred-deg2 DECam Imaging in Narrowbands (ODIN) survey. Of the 7498 LAEs (4101 in COSMOS and 3397 in XMM-LSS), we excluded LAEs that are either likely low-z objects or contaminated by neighboring sources. Additional background modeling process with thorough quality assessments leaves a final sample of 851 galaxies. We then performed forced photometry on u/u*-band images from the CFHT large area u-band deep survey to measure their LyC fluxes. This represents the largest sample of z = 4.5 LAEs searched for such a purpose. Within this sample, we identified 12 “gold” and 39 “silver” LyC-emitting candidates, with LyC fluxes detected of >3σ and between 2σ and 3σ, respectively, in the range of 5.16–55.29 nJy. No LyC signal is detected in the weighted mean stack of the final sample (0.20 ± 0.37 nJy). Given the UVC magnitudes of LAEs in our sample, the expected LyC emission is likely below the detection limit even when stacking the full sample of ODIN LAEs. Nevertheless, having a large sample of LAEs remains valuable for identifying individual LyC leaker candidates. Among the gold and silver candidates, the LyC flux appears to correlate positively with UVC flux and negatively with Lyα equivalent width, although the correlations are weak. A larger sample of LyC leakers will allow a more robust confirmation of these trends and provide better insights into their physical origins.
AB - We investigated Lyman-continuum (LyC) emission from Lyman-alpha emitters (LAEs) at z = 4.5, identified in the One-hundred-deg2 DECam Imaging in Narrowbands (ODIN) survey. Of the 7498 LAEs (4101 in COSMOS and 3397 in XMM-LSS), we excluded LAEs that are either likely low-z objects or contaminated by neighboring sources. Additional background modeling process with thorough quality assessments leaves a final sample of 851 galaxies. We then performed forced photometry on u/u*-band images from the CFHT large area u-band deep survey to measure their LyC fluxes. This represents the largest sample of z = 4.5 LAEs searched for such a purpose. Within this sample, we identified 12 “gold” and 39 “silver” LyC-emitting candidates, with LyC fluxes detected of >3σ and between 2σ and 3σ, respectively, in the range of 5.16–55.29 nJy. No LyC signal is detected in the weighted mean stack of the final sample (0.20 ± 0.37 nJy). Given the UVC magnitudes of LAEs in our sample, the expected LyC emission is likely below the detection limit even when stacking the full sample of ODIN LAEs. Nevertheless, having a large sample of LAEs remains valuable for identifying individual LyC leaker candidates. Among the gold and silver candidates, the LyC flux appears to correlate positively with UVC flux and negatively with Lyα equivalent width, although the correlations are weak. A larger sample of LyC leakers will allow a more robust confirmation of these trends and provide better insights into their physical origins.
UR - https://www.scopus.com/pages/publications/105037718150
UR - https://www.scopus.com/pages/publications/105037718150#tab=citedBy
U2 - 10.3847/1538-4357/ae523e
DO - 10.3847/1538-4357/ae523e
M3 - Article
AN - SCOPUS:105037718150
SN - 0004-637X
VL - 1001
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
ER -