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PreprintCC BY 4.0arXiv

Rest-Frame UV and Optical Structural Evolution of Narrowband-Selected Lyman-alpha Emitters at z = 2-7 with JWST/NIRCam

  • Ronaldo Laishram
  • Haruka Kusakabe
  • Satoshi Kikuta
  • Shunta Shimizu
  • Yusei Koyama
  • Tadayuki Kodama
  • Michaela Hirschmann
  • Greta Toni
  • Carter Flayhart
  • Rasha M. Samir
  • Novan Saputra Haryana
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Abstract

We present a systematic study of the rest-frame ultraviolet (UV) and optical morphologies of Lyα emitters (LAEs) at z ≃ 2-$7$ from the SILVERRUSH multi-narrowband catalog, using JWST/NIRCam imaging from COSMOS-Web. We fit Sérsic profiles in four NIRCam filters (F115W, F150W, F277W, F444W) for LAEs spanning ∼ 2.2 Gyr of cosmic time. LAE sizes show a mild increase from rest-frame UV to optical wavelengths, with a median optical-to-UV size ratio of Re,opt/Re,UV = 1.14+0.01−0.02, indicating a small morphological K-correction; this offset is significant at z ≤ 5.7 but not at z = 6.6. The rest-frame optical sizes follow a power-law evolution, given by Re ∝ (1+z)−0.94 ± 0.09, decreasing from 0.91+0.07−0.07 kpc at z = 2.2 to ∼ 0.5 kpc at z ≳ 5, in close agreement with a recent JWST study of spectroscopically confirmed LAEs. The rest-frame optical size-mass relation slopes are broadly consistent with those of the general star-forming galaxy (SFG) population, while LAEs lie below it in normalization over z ∼ 3-$6$. More compact LAEs tend to exhibit higher Lyα equivalent widths, a trend driven mainly by the most compact, marginally resolved sources. These compact systems also occupy elevated SFR surface-density regimes, consistent with a scenario in which concentrated star formation may facilitate Lyα escape. No significant correlation of LAE rest-frame optical size with projected large-scale environment is found over z ≃ 2-$7$, suggesting that LAE morphology may be governed primarily by internal galaxy properties, except possibly in the most extreme overdensities.

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Cite

BibTeXRIS
BibTeX
@misc{laishram2026restframe,
  title = {{Rest-Frame UV and Optical Structural Evolution of Narrowband-Selected Lyman-alpha Emitters at z = 2-7 with JWST/NIRCam}},
  author = {Ronaldo Laishram and Haruka Kusakabe and Satoshi Kikuta and Shunta Shimizu and Yusei Koyama and Tadayuki Kodama and Michaela Hirschmann and Greta Toni and Carter Flayhart and Rasha M. Samir and Novan Saputra Haryana},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.25886},
  eprint = {2609.25886},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.25886},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Rest-Frame UV and Optical Structural Evolution of Narrowband-Selected Lyman-alpha Emitters at z = 2-7 with JWST/NIRCam
AU  - Ronaldo Laishram
AU  - Haruka Kusakabe
AU  - Satoshi Kikuta
AU  - Shunta Shimizu
AU  - Yusei Koyama
AU  - Tadayuki Kodama
AU  - Michaela Hirschmann
AU  - Greta Toni
AU  - Carter Flayhart
AU  - Rasha M. Samir
AU  - Novan Saputra Haryana
PY  - 2026
DA  - 2026/09/22
PB  - arXiv
DO  - 10.48550/arxiv.2609.25886
UR  - https://arxiv.org/abs/2609.25886
AB  - We present a systematic study of the rest-frame ultraviolet (UV) and optical morphologies of Lyα emitters (LAEs) at z ≃ 2-$7$ from the SILVERRUSH multi-narrowband catalog, using JWST/NIRCam imaging from COSMOS-Web. We fit Sérsic profiles in four NIRCam filters (F115W, F150W, F277W, F444W) for LAEs spanning ∼ 2.2 Gyr of cosmic time. LAE sizes show a mild increase from rest-frame UV to optical wavelengths, with a median optical-to-UV size ratio of R_e,opt/R_e,UV = 1.14^+0.01_−0.02, indicating a small morphological K-correction; this offset is significant at z ≤ 5.7 but not at z = 6.6. The rest-frame optical sizes follow a power-law evolution, given by R_e ∝ (1+z)^−0.94 ± 0.09, decreasing from 0.91^+0.07_−0.07 kpc at z = 2.2 to ∼ 0.5 kpc at z ≳ 5, in close agreement with a recent JWST study of spectroscopically confirmed LAEs. The rest-frame optical size-mass relation slopes are broadly consistent with those of the general star-forming galaxy (SFG) population, while LAEs lie below it in normalization over z ∼ 3-$6$. More compact LAEs tend to exhibit higher Lyα equivalent widths, a trend driven mainly by the most compact, marginally resolved sources. These compact systems also occupy elevated SFR surface-density regimes, consistent with a scenario in which concentrated star formation may facilitate Lyα escape. No significant correlation of LAE rest-frame optical size with projected large-scale environment is found over z ≃ 2-$7$, suggesting that LAE morphology may be governed primarily by internal galaxy properties, except possibly in the most extreme overdensities.
ER  -